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2985 results about "Doped carbon" patented technology
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Method for forming an electrostatically-doped carbon nanotube device
InactiveUS6890780B2Improved performance characteristicsNanoinformaticsSolid-state devicesCapacitanceCapacitive coupling
Owner:GENERAL ELECTRIC CO
Microelectromechanical systems, and methods for encapsulating and fabricating same
ActiveUS20060108652A1Acceleration measurement using interia forcesSemiconductor/solid-state device detailsIntegrated circuitEngineering
There are many inventions described and illustrated herein. In one aspect, the present invention is directed to a MEMS device, and technique of fabricating or manufacturing a MEMS device, having mechanical structures encapsulated in a chamber prior to final packaging. The material that encapsulates the mechanical structures, when deposited, includes one or more of the following attributes: low tensile stress, good step coverage, maintains its integrity when subjected to subsequent processing, does not significantly and / or adversely impact the performance characteristics of the mechanical structures in the chamber (if coated with the material during deposition), and / or facilitates integration with high-performance integrated circuits. In one embodiment, the material that encapsulates the mechanical structures is, for example, silicon (polycrystalline, amorphous or porous, whether doped or undoped), silicon carbide, silicon-germanium, germanium, or gallium-arsenide.
Owner:ROBERT BOSCH GMBH
Doped carbonaceous materials for photocatalytic removal of pollutants under visible light, making methods and applications of same
ActiveUS20190015818A1Efficient removalWater/sewage treatment by irradiationWater treatment compoundsSuperoxide radicalSinglet oxygen
A method of synthesizing a doped carbonaceous material includes mixing a carbon precursor material with at least one dopant to form a homogeneous / heterogeneous mixture; and subjecting the mixture to pyrolysis in an inert atmosphere to obtain the doped carbonaceous material. A method of purifying water includes providing an amount of the doped carbonaceous material in the water as a photocatalyst; and illuminating the water containing the doped carbonaceous material with visible light such that under visible light illumination, the doped carbonaceous material generates excitons (electron-hole pairs) and has high electron affinity, which react with oxygen and water adsorbed on its surface forming reactive oxygen species (ROS), such as hydroxyl radicals and superoxide radicals, singlet oxygen, hydrogen peroxide, that, in turn, decompose pollutants and micropollutants.
Owner:THE BOARD OF TRUSTEES OF THE UNIV OF ARKANSAS
Process for preparing carbon quantum dots using emulsion
InactiveUS20150361334A1High reaction yieldEffective controlOrganic chemistryNano-carbonQuantum yieldEmulsion
The present invention provides a process for preparing carbon quantum dots having uniform size by using emulsion, and a process for doping the inside of the carbon structure with other element or replacing the surface with a surface stabilizer having a specific chemical functional group different from existing stabilizers in order to control the properties of the carbon quantum dots. The process for preparing the carbon quantum dots according to the present invention makes a mass production possible and the process thereof is simple. Furthermore, the process is easy to control the size of the quantum dots and the reaction yield rate of the method is excellent. In addition, according to the present invention, it is possible to synthesize carbon quantum dots having uniform size and superior quantum yield rate and it makes it possible to embody the color as equivalent to existing molecular chromophores or heavy metal quantum dots by changing the structure of the chromophore.
Owner:POSTECH ACAD IND FOUND
Rare earth doped carbon clad type nanometer anode material iron lithium phosphate and its preparation method
InactiveCN1830764AIncrease capacityImprove cycle lifeCell electrodesPhosphorus compoundsEpoxyRare earth
A carbon-coated RE-doped iron lithium phosphate nano-particle used for positive electrode of battery is prepared from FeC2H4, H2O, Li2CO3, NH4H2PO4, Y2O3, CeO2 and epoxy resin through proportional mixing, ball grinding, baking, sieving, calcining in N2 atmosphere at 350 deg.C and 600-750 deg.C respectively, and keeping the temp for a certain time.
Owner:TSINGHUA UNIV +1
Preparation method for fluorescence carbon-based quantum dot
The invention provides a preparation method for a fluorescence carbon-based quantum dot. The preparation method for the fluorescence carbon-based quantum dot at least comprises the steps of providing oxidized carbon-based quantum dot powder; providing a solvent, and dispersing the oxidized carbon-based quantum dot powder into the solvent to obtain the oxidized carbon-based quantum dot solution; adding a doping agent into the oxidized carbon-based quantum dot solution, reducing the oxidized carbon-based quantum dot by utilizing the solvent thermal reaction so as to obtain the doped carbon-based quantum dot. According to the invention, the technical scheme that oxidized carbon-based quantum dot is taken as a raw material and the solvent thermal reduction and doping are synchronously carried out is adopted, the carbon-based quantum dot represented by graphene quantum dot and carbon quantum dot can be reduced and doped by adopting various easily available nonmetal compounds or metal compounds through the solvent thermal reaction, the yield of a product is high, the regulation on the fluorescent spectrum of the carbon-based quantum dot can be realized, and the yield of quantum can be improved.
Owner:SHANGHAI INST OF MICROSYSTEM & INFORMATION TECH CHINESE ACAD OF SCI
Method for preparing non-metallic element doped carbon coated metal nanoparticle magnetic composite
ActiveCN105478755AGood dispersionHigh purityTransportation and packagingMetal-working apparatusDispersityCyanamide compound
The invention discloses a method for preparing a non-metallic element doped carbon coated metal nanoparticle magnetic composite. The method comprises the steps that water-soluble metal divalent salt, a cyanamide compound and a nitrogen or boron or sulfur containing non-metallic compound are added into a methanol solution to be mixed, dissolved, dried and ground, and obtained homogeneous-phase powder is subjected to roasting pyrolysis under the protection of inert gas; and a pyrolysis product is subjected to acid pickling, washing, drying and grinding, and a target product is obtained. According to the whole preparing process of the method, metal ion reduction, metal nanoparticle coating and doping of nitrogen / boron / sulfur and other non-metallic elements are achieved in one step. The composite prepared through the method is high in degree of graphitization, good in dispersity between particles and high in purity, and the preparing method has the advantages that the cost is low, the process is simple, and large-quantity synthesis can be easily achieved.
Owner:合肥庐阳科技创新集团有限公司
Single, multi-walled, functionalized and doped carbon nanotubes and composites thereof
The present invention relates to single walled and multi-walled carbon nanotubes (CNTs), functionalized CNTs and carbon nanotube composites with controlled properties, to a method for aerosol synthesis of single walled and multi-walled carbon nanotubes, functionalized CNTs and carbon nanotube composites with controlled properties from pre-made catalyst particles and a carbon source in the presence of reagents and additives, to functional, matrix and composite materials composed thereof and structures and devices fabricated from the same in continuous or batch CNT reactors. The present invention allows all or part of the processes of synthesis of CNTs, their purification, doping, functionalization, coating, mixing and deposition to be combined in one continuous procedure and in which the catalyst synthesis, the CNT synthesis, and their functionalization, doping, coating, mixing and deposition can be separately controlled.
Owner:CANATU OY
Preparation method of heteroatom doped multifunctional carbon quantum dot and application thereof
InactiveUS20150218001A1High-temperature carbonizationEasy to modifyUltrasonic/sonic/infrasonic diagnosticsMaterial nanotechnologyPhotocatalytic water splittingCarbonization
The present invention discloses a method for preparing heteroatom doped carbon quantum dot, and application thereof in fields of biomedicine, catalysts, photoelectric devices, etc. The various kinds of heteroatom doped carbon quantum dots are obtained by using a conjugated polymer as a precursor and through a process of high temperature carbonization. These carbon quantum dots contain one or more heteroatoms selected from the group consisting of N, S, Si, Se, P, As, Ge, Gd, B, Sb and Te, the absorption spectrum of which ranges from 300 to 850 nm, and the fluorescence emission wavelength of which is within a range of 350 to 1000 nm. The carbon quantum dot has a broad application prospect in serving as a new type photosensitizer, preparing drugs for photodynamic therapy of cancer and sterilization, photocatalytic degradation of organic pollutants, photocatalytic water-splitting for hydrogen generation, organic polymer solar cell and quantum dot-sensitized solar cell.
Owner:TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
Nitrogen-phosphorus double-doped carbon-coated transition metal diphosphide hydrogen evolution catalyst and preparation method thereof
InactiveCN107362818AHigh activityImprove stabilityCatalyst activation/preparationElectrodesPlatinumStructural formula
The invention relates to a nitrogen-phosphorus double-doped carbon-coated transition metal diphosphide hydrogen evolution catalyst and a preparation method thereof. The nitrogen-phosphorus double-doped carbon-coated transition metal diphosphide is characterized in that the structural formula is MP2@NPC, a transition metal diphosphide MP2 is used as a core, nitrogen-phosphorus double-doped carbon NPC is used as a shell so that a core-shell structure is formed, the diphosphide has a nano-particle structure, the particle size is less than 50nm and good crystallinity is obtained. The composite catalyst has the electrocatalytic hydrogen evolution activity similar to that of the commercial platinum carbon and catalyst stability better than that of the commercial catalyst. The catalyst has a wide application prospect.
Owner:WUHAN UNIV OF TECH
Heteratom doped carbon nano-tube-graphene complex and preparation method thereof
ActiveCN103407985AHigh reactivityImprove conductivityMaterial nanotechnologyGrapheneCarbon nanotubeElectrochemistry
The present invention discloses a heteratom doped carbon nano-tube-graphene complex and a preparation method thereof, and belongs to the technical field of new material preparation. The complex comprises carbon nano-tubes and graphene, wherein heteroatoms are introduced into the complex. The preparation method comprises: adopting catalyst active component loading layered material as a catalyst, adopting chemical vapor deposition, and growing the heteratom doped carbon nano-tube and graphene complex in the presence of a heteratom source. The heteratom doped carbon nano-tube-graphene complex has excellent characteristics of more active sites, good conductivity, easy chemical modification and the like based on maintaining of intrinsic e excellent performances of carbon nano-tubes and graphene, and provides good application prospects in the fields of catalysis, electrochemistry, energy storage and conversion, electronic devices, and the like. The preparation method has characteristics of simpleness, easy engineering magnification, and macroscopic quantity preparation achievement so as to promote carbon nano-tube-graphene complex industrial application.
Owner:TSINGHUA UNIV
Hardmask materials
ActiveUS20110135557A1Poor pattern alignmentReduce stressLiquid surface applicatorsElectric discharge tubesMaterials sciencePost treatment
Hardmask films having high hardness and low stress are provided. In some embodiments a film has a stress of between about −600 MPa and 600 MPa and hardness of at least about 12 GPa. In some embodiments, a hardmask film is prepared by depositing multiple sub-layers of doped or undoped silicon carbide using multiple densifying plasma post-treatments in a PECVD process chamber. In some embodiments, a hardmask film includes a high-hardness boron-containing film selected from the group consisting of SixByCz, SixByNz, SixByCzNw, BxCy, and BxNy. In some embodiments, a hardmask film includes a germanium-rich GeNx material comprising at least about 60 atomic % of germanium. These hardmasks can be used in a number of back-end and front-end processing schemes in integrated circuit fabrication.
Owner:NOVELLUS SYSTEMS
Methods of synthesizing three-dimensional heteroatom-doped carbon nanotube macro materials and compositions thereof
ActiveUS20120238021A1Robust elastic mechanical propertyImprove conductivityCarbon compoundsSeawater treatmentDoped carbonElbow joints
Methods for synthesizing macroscale 3D heteroatom-doped carbon nanotube materials (such as boron doped carbon nanotube materials) and compositions thereof. Macroscopic quantities of three-dimensionally networked heteroatom-doped carbon nanotube materials are directly grown using an aerosol-assisted chemical vapor deposition method. The porous heteroatom-doped carbon nanotube material is created by doping of heteroatoms (such as boron) in the nanotube lattice during growth, which influences the creation of elbow joints and branching of nanotubes leading to the three dimensional super-structure. The super-hydrophobic heteroatom-doped carbon nanotube sponge is strongly oleophilic and an soak up large quantities of organic solvents and oil. The trapped oil can be burnt off and the heteroatom-doped carbon nanotube material can be used repeatedly as an oil removal scaffold. Optionally, the heteroatom-doped carbon nanotubes in the heteroatom-doped carbon nanotube materials can be welded to form one or more macroscale 3D carbon nanotubes.
Owner:RICE UNIV +1
Highly fluorescent carbon nanoparticles and methods of preparing the same
InactiveUS20120178099A1Small particle sizeImprove colloidal stabilityMaterial nanotechnologyNanosensorsQuantum yieldSynthesis methods
Highly fluorescent carbon nanoparticles (FCNs), with tunable emission colours of particle size between 1-10 nm also stable in solid form with high quantum yield (>5%) and its method of synthesis thereof yielding said carbon nanoparticles in milligram to gram scale in high synthesis yield (>80%). The present invention also provides for highly fluorescent carbon nanoparticle solution doped with heteroatom (such as oxygen, nitrogen) and its method of synthesis favoring yield of the said doped carbon nanoparticles of even smaller size ranging from 1-5 nm with narrow size distribution, and also provides for functionalized FCNs that are non-toxic, functional, soluble and stable fluorescent carbon nanoparticles with retained fluorescence for variety of end uses in biomedics, imaging applications, and detection techniques.
Owner:INDIAN ASSOC FOR THE CULTIVATION OF SCI AN AUTONOMOUS INST UNDER THE AEGIS OF DEPT OF SCI & TECH GOVERNMENT OF INDIA
Carbon-silicon composite negative electrode material of lithium ion battery and preparation method thereof
InactiveCN103618071ACoated evenlyImprove the first charge and discharge efficiencyCell electrodesSecondary cellsCarbon compositesPorous carbon
The invention discloses a carbon-silicon composite negative electrode material of a lithium ion battery and a preparation method of the carbon-silicon composite negative electrode material. The negative electrode material is prepared by coating the surface of a single silicon particle with a uniform carbon-cladding layer, an impurity-element-doped carbon-cladding layer or a porous carbon-cladding layer. By adopting a hydrothermal method and subsequent calcining method, environmental friendliness can be achieved, the procedure is simple and easiness in operation can be realized; the silicon and a resilient carbon carrier form a composite material, the electrochemical performance of the silicon material can be improved through the complementary advantages under the synergistic effect of carbon and silicon components, and the primary charging-discharging efficiency and the cycling stability can be improved. The prepared silicon-carbon composite negative electrode material of the lithium ion battery has the advantages of high specific capacity, good cycling stability, safety, no pollution and the like, and an effective way is provided for the research of a high-capacity lithium ion battery.
Owner:GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
Expanded graphite and nano-silicon composite material, preparation method thereof, electrode plate and battery
ActiveCN105355870AHigh tap densityHigh solid densityMaterial nanotechnologyCell electrodesNano siliconHigh density
The invention provides a preparation method of a high-density expanded graphite and nano-silicon composite material. The preparation method comprises the following steps: step S1, oxidizing graphite to manufacture graphite oxide; step S2, carrying out heat treatment on the graphite oxide to manufacture expanded graphite; step S3, mixing the expanded graphite with nano-silicon and a carbon source and carrying out ball-milling to obtain a high-density expanded graphite and nano-silicon composite material precursor comprising a plurality of graphite layers, the carbon source and the nano-silicon filled among the graphite layers; step S4, carrying out heat treatment on the high-density expanded graphite and nano-silicon composite material precursor so that the carbon source is converted into amorphous carbon; and step S5, depositing carbon or doped carbon on the surface of the high-density expanded graphite and nano-silicon composite material precursor after the heat treatment. Moreover, the invention also provides the high-density expanded graphite and nano-silicon composite material, an electrode plate applying the high-density expanded graphite and nano-silicon composite material, and a lithium ion battery applying the electrode plate.
Owner:SHENZHEN GRADUATE SCHOOL TSINGHUA UNIV
Phosphorus-doped nickel cobalt sulfide/carbon nanotube-carbon nanofiber composite material and preparation method thereof
InactiveCN106076377AEasy to makeEasy to operatePhysical/chemical process catalystsElectrodesFiberNew energy
The invention belongs to the technical field of transitional-metal sulfide-carbon materials, and concretely relates to a phosphorus-doped nickel cobalt sulfide / carbon nanotube-carbon nanofiber composite material and a preparation method thereof. The preparation method comprises preparing carbon nanotube-doped carbon nanofiber through electrostatic spinning and high-temperature carbonization, then growing nickel cobalt sulfide nanorod in situ through a hydrothermal process, and finally calcining a phosphorus-containing precursor at a high temperature in an atmosphere of an inert gas, so as to prepare the phosphorus-doped composite material. The prepared carbon nanofiber possesses relatively large specific surface area, and the electric conductivity is effectively enhanced by doping carbon nanotube. By taking the carbon naofiber as a substrate, nickel cobalt sulfide nanorod uniformly densely grows on the surface of the composite fiber, and the synergistic effect of various substances is fully displayed. By doping phosphorus, the electrochemical activity of the composite material is further improved. The prepared phosphorus-doped nickel cobalt sulfide / carbon nanotube-carbon nanofiber composite material is applicable as a high-performance electro-catalytic material and an electrode material of lithium ion battery, solar cells and other new-energy-source devices.
Owner:FUDAN UNIV
Microelectrode array sensor for detection of heavy metals in aqueous solutions
InactiveUS20110308942A1Semiconductor/solid-state device manufacturingPhotomechanical exposure apparatusShortest distanceMicroelectrode
In a first aspect, the present invention is directed to a microelectrode array for detecting heavy metals in an aqueous solution. The microelectrode array can comprise a layer of a doped carbon film and a patterning layer arranged on the doped carbon film for defining multiple microelectrodes in the doped carbon film to form the microelectrode array. The size, and shape, and arrangement of each of the multiple microelectrodes can be defined by the size, and shape, and arrangement of each of the openings in the patterning layer which expose the underlying doped carbon film. Furthermore, the ratio of the maximal width of a microelectrode relative to the shortest distance between the neighboring microelectrodes (center to center) in the microelectrode array is between about 1:1.2 and about 1:6. The present invention is also directed to an apparatus using the microelectrode array and methods of manufacturing the same.
Owner:NANYANG TECH UNIV
Fe, Ni and N three-doped carbon nanotube coated type FeNi@NCNT catalyst as well as preparation method and application thereof
InactiveCN108543545AIncrease the areaImprove conductivityPhysical/chemical process catalystsCell electrodesMetal particleOxygen
The invention discloses a Fe, Ni and N three-doped carbon nanotube coated type FeNi@NCNT catalyst as well as a preparation method and application thereof, and belongs to the fields of energy materialsand electrochemistry. The catalyst is prepared by using dicyandiamide as a C source and N source and ammonium ferric citrate and NiCl2.6H2O as metal sources, adopting one pot method and performing pyrolysis in two steps; and a plurality of Fe and Ni metal particles in the catalyst are uniformly wrapped in walls of ''bamboo-like'' N-doped carbon nanotubes, and a small number of the particles are distributed at the tip ends of the carbon nanotubes. Compared with a common metal alloy oxygen reduction reaction and oxygen evolution reaction bifunctional catalyst, the catalyst disclosed by the invention exhibits good oxygen evolution reaction activity and stability under alkaline conditions; the preparation method is simple, and raw materials used in the method have low costs and wide sources;and the catalyst can be widely used in the fields of proton exchange membrane fuel cells, electrolyzed water, metal-air batteries and the like, and has higher practical value.
Owner:DALIAN UNIV OF TECH
Nitrogen-sulfur double-doped carbon material difunctional oxygen catalyst and preparation method and application thereof
InactiveCN106207204AReduce overpotentialLarge specific surface areaCell electrodesThioureaElectronegativity
The invention relates to a nitrogen-sulfur double-doped carbon material difunctional oxygen catalyst, a preparation method thereof and electrocatalysis application of alkaline medium in oxygen. In the catalyst, ocean polysaccharide sodium alginate is used as a carbon source, thiourea is sources of nitrogen and sulfur atoms, and double doping is performed on N and S which have electronegativity by high-temperature calcination in an inertia atmosphere to obtain a nitrogen-sulfur double-doped carbon material electrocatalyst. Since a double-doped crystal structure of heteroatoms is changed, the specific area and the catalyst site of the catalyst are improved, meanwhile, relatively high oxygen evolution (OER) and oxygen reduction (ORR) catalytic activity are achieved, and the overoptential of OER and ORR is effectively reduced; the ORR process is most divided to four electron catalytic mechanisms and is an relatively ideal ORR reaction process, and the catalyst has favorable stability and excellent methyl alcohol resistance; and the used raw material is low in cost, the preparation method is simple and is easy to operate, and mass production is facilitated.
Owner:QINGDAO UNIV OF SCI & TECH
Thermoelectric Apparatus And Applications Thereof
ActiveUS20130312806A1Material nanotechnologyThermoelectric device with peltier/seeback effectCarbon NanoparticlesMaterials science
In some embodiments, thermoelectric apparatus and various applications of thermoelectric apparatus are described herein. In some embodiments, a thermoelectric apparatus described herein comprises at least one p-type layer coupled to at least one n-type layer to provide a pn junction, and an insulating layer at least partially disposed between the p-type layer and the n-type layer, the p-type layer comprising a plurality of carbon nanoparticles and the n-type layer comprising a plurality of n-doped carbon nanoparticles.
Owner:WAKE FOREST UNIV
Oxygen-doped carbon nitride/zinc oxide photo-catalyst as well as preparation method and application thereof
ActiveCN104084228ALow costSimple preparation conditionsPhysical/chemical process catalystsWater/sewage treatment by irradiationOxygenUltrasonic dispersion
The invention discloses an oxygen-doped carbon nitride / zinc oxide photo-catalyst as well as a preparation method and application of the oxygen-doped carbon nitride / zinc oxide photo-catalyst. The preparation method comprises the following steps: taking dicyandiamide or melamine as a precursor, calcining to prepare a carbon nitride nanosheet; adding a zinc oxide precursor into absolute ethyl alcohol, then adding dethylenetriamine, carrying out ultrasonic dispersion and subsequently enabling dispersion liquid to be subjected to hydrothermal reaction, so as to obtain zinc oxide nano material; enabling the zinc oxide nano material and the carbon nitride nanosheet to be subjected to ultrasonic dispersion in deionized water, subsequently adding hydrogen peroxide, then carrying out hydrothermal reaction again, and thus obtaining the oxygen-doped carbon nitride / zinc oxide photo-catalyst after the reaction is ended. The oxygen-doped carbon nitride / zinc oxide photo-catalyst adopts low-cost and easily available raw materials; the preparation condition can be easily achieved; the raw materials do not need to be calcined under the condition of high temperature, so that the cost for preparing the oxygen-doped carbon nitride / zinc oxide photo-catalyst is reduced, and the popularization and application of the preparation method are facilitated; meanwhile, the photo-catalyst is low in photo-production electron-cavity compounding efficiency and high in photo-catalytic activity.
Owner:SOUTH CHINA UNIV OF TECH
Nitrogen-doped carbon nanotube-loaded nitrogen-doped carbon-coated iron-cobalt alloy bifunctional catalyst and preparation method and application thereof
InactiveCN110783582ALarge specific surface areaMany active sitesMaterial nanotechnologyFuel and secondary cellsCarbon layerPtru catalyst
The invention discloses a nitrogen-doped carbon nanotube-loaded nitrogen-doped carbon-coated iron-cobalt alloy bifunctional catalyst and a preparation method and an application thereof. The catalyst is characterized in that for a structural unit, nitrogen-doped carbon nanotubes (NCNTs) are utilized as a conductive network, and iron-cobalt alloy nanoparticles wrapped by a nitrogen-doped ultrathin carbon layer are loaded on the nitrogen-doped ultrathin carbon layer. The preparation method comprises steps of pretreatment of carbon nanotubes, removing impurities on surfaces of the carbon nanotubesthrough cleaning, and generating a large number of defects and oxygen-containing surface functional groups on the surfaces of the carbon nanotubes through acid treatment; carrying out grafting reaction of an iron-cobalt organic ligand and melamine on the surfaces of the functionalized carbon nanotubes; calcining the iron-cobalt organic ligand and the melamine-grafted functionalized carbon nanotubes under a high-temperature condition to obtain the nitrogen-doped carbon nanotube-loaded nitrogen-doped carbon-coated iron-cobalt alloy bifunctional catalyst.
Owner:ZHEJIANG SCI-TECH UNIV
Doped carbon-sulfur species nanocomposite cathode for li-s batteries
ActiveUS20140017569A1Reduced diffusion lossImprove Coulombic efficiencyConductive materialOrganic conductorsLithium sulfurHeteroatom
We report a heteroatom-doped carbon framework that acts both as conductive network and polysulfide immobilizer for lithium-sulfur cathodes. The doped carbon forms chemical bonding with elemental sulfur and / or sulfur compound. This can significantly inhibit the diffusion of lithium polysulfides in the electrolyte, leading to high capacity retention and high coulombic efficiency.
Owner:PENN STATE RES FOUND
Sulfur-carbon composite material with nitrogen-doped porous carbon nanofiber net-shaped structure, as well as preparation method and application of composite material
InactiveCN103700818AEvenly distributedSimple processCell electrodesLi-accumulatorsCarbon compositesElectrolytic agent
The invention belongs to the technical field of lithium sulfur batteries, specifically relates to a sulfur-carbon composite material with a nitrogen-doped porous carbon nanofiber net-shaped structure, as well as a preparation method and an application of the composite material. By taking a polypyrrole net-shaped structure which is synthesized by virtue of a soft template method as a raw material, taking the potassium hydroxide as a pore forming agent, and taking the nitrogen-doped carbon nanofiber net-shaped structure which is synthesized through high-temperature carbonization under nitrogen atmosphere and is in a porous structure as a precursor, the sulphur-carbon composite material which can be used as the anode of the lithium sulfur battery can be prepared through heat treatment with elemental sulfur. The preparation method provided by the invention is simple, and good in reproducibility, and the prepared composite material is uniform in structure distribution, and can be used as the anode of the lithium sulfur battery. Due to the nitrogen doping and the tridimensional net-shaped structure, for the material, the conductivity can be improved, a transmission path of lithium ions is shortened, meanwhile, the dissolving of the sulfur and intermediate product in an electrolyte can be prevented, the electrochemistry performance of a positive material of the lithium sulfur battery is improved, good specific discharge capacity, cycle performance and rate performance can be achieved.
Owner:FUDAN UNIV
Nitrogen-doped carbon nanometer particle as well as preparation method and application thereof
InactiveCN103113886AOvercoming the technical problem of easy fluorescence quenchingEasy to prepareNon-macromolecular adhesive additivesInksMicrowave methodSolvent
The invention discloses a nitrogen-doped carbon nanometer particle as well as a preparation method and application thereof, belongs to the field of nanometer material science and is used for solving the technical problems that fluorescence quenching is easily caused to the aggregative state of the carbon nanometer particle due to surface passivation modifier which is added for the preparation of existing carbon nanometer particles. The nitrogen-doped carbon nanometer particle is prepared through a microwave method by using organic compounds containing polycarboxyl or polyhydroxy as materials and using ammonia water as a solvent and a nitrogen doping source. The invention further provides the application of the nitrogen-doped carbon nanometer particle as fluorescent ink and fluorescent glue. The preparation method disclosed by the invention is simple, low in cost, and convenient to realize large-scale production; the maximal fluorescent quantum efficiency of the solid film formed by the prepared fluorescent glue is as high as 84%; the prepared fluorescent ink is non-toxic, generates no precipitates after being placed for a long time, is strong in fluorescence characteristic and can be applied to various fields such as bio-imaging, biological product identification, information storage, information encryption, counterfeiting prevention, illumination and display, sensing and photovoltaic devices.
Owner:CHANGCHUN INST OF OPTICS FINE MECHANICS & PHYSICS CHINESE ACAD OF SCI
Modified Carbon Nanotubes and Methods of Forming Carbon Nanotubes
ActiveUS20090142581A1Improved near infrared （NIR） transmittanceImprove work functionMaterial nanotechnologyLayered productsDopantModified carbon
In this invention, processes which can be used to achieve stable doped carbon nanotubes are disclosed. Preferred CNT structures and morphologies for achieving maximum doping effects are also described. Dopant formulations and methods for achieving doping of a broad distribution of tube types are also described.
Owner:BATTELLE MEMORIAL INST
Production method of core-shell hierarchical structure porous carbon
The invention belongs to the technical field of carbon material production and relates to a production method of core-shell hierarchical structure porous carbon. The production method based on a metal organic frame is characterized in that polymer monomer containing nitrogen polymerizes on the surface of the hollow metal organic frame to form a core-shell structure, calcination is controlled to obtain the core-shell hierarchical porous carbon, the core is nanoscale hollow hierarchical porous carbon, and the shell is nitrogen-doped carbon. The core-shell hierarchical structure porous carbon has a hierarchical duct structure, nanoscale particle size and high conductivity. The method is simple, easy in process control, widely applicable to electrochemical fields such as super-capacitors, capacitive desalting and lithium ion battery.
Owner:SHANGHAI UNIV
Transition metal-doped carbon fluorescent quantum dot preparation method
The present invention relates to a transition metal-doped carbon fluorescent quantum dot preparation method, which comprises: dissolving a metal chelating agent and a transition metal salt in an organic solvent, carrying out a solvothermal reaction, and carrying out concentration purification after the reaction to prepare the transition metal-doped carbon fluorescent quantum dots having good water solubility. According to the present invention, the operation of the method is simple, the metal ion doping on the carbon fluorescent quantum dots can be achieved without harsh reaction conditions or large instruments, such that the characteristic that the long wavelength fluorescence emission is not easily achieved by the general carbon dots can be achieved; the obtained carbon fluorescent quantum dots have characteristics of good water solubility, wide fluorescence emission range, and maximum emission wavelength change along with concretion change; and with the characteristics of the preparation method, the prepared transition metal-doped carbon fluorescent quantum dots provide great application values in the fields of biological labeling sensing and medical imaging, photoelectricity, light-emitting device preparation, and the like.
Owner:DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
Preparation method of mono-atomic cobalt based nitrogen-sulfur dually-doped carbon material catalyst
InactiveCN108686693AImprove mass transfer effectImprove conductivityPhysical/chemical process catalystsCarbon layerCarbonization
A metal ligand is changed, and through precisely controlled carbonization and metal high temperature reduction, a metal mono-atomic nitrogen-sulfur dually-doped carbon material is obtained. An S-containing ligand is added to prevent the generation of metal carbides during the pyrolysis process; the temperature and time of pyrolysis are controlled to avoid the precipitation of a carbon layer; metalions are anchored in a carbon skeleton of graphene; exposed metal nitrides and metal sulfides on the surface can be easily removed by acids; mono-atom level dispersion of metals in a graphene structure is realized, and at the same time, more active sites are exposed. The adjusting function of S during the pyrolysis process is smartly utilized to synthesize a metal mono-atomic catalyst, all metalatoms (100%) are utilized, and the dispersion, stability, and characteristic activity of the catalyst are all improved. Furthermore, the synergistic effect is generated by co-doping of nitrogen and sulfur and the catalytic activity is further enhanced. The prepared mono-atomic catalyst has excellent hydrogen evolution / oxygen reduction catalytic activity, the operation is simple, the industrial production is easy, and the catalyst can be widely applied to fuel cells that take a proton exchange membrane as the electrolyte.
Owner:CHONGQING UNIV
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