101results about How to "Wide response range" patented technology

A black silicon based metal-semiconductor-metal photodetector includes a silicon substrate and a black silicon layer formed on the silicon substrate. An interdigitated electrode pattern structure is formed on the black silicon layer, which can be a planar or U-shaped structure. A thin potential barrier layer is deposited at the interdigitated electrode pattern structure. An Al or transparent conductive ITO thin film is deposited on the thin potential barrier layer. A passivation layer is provided on the black silicon layer. In the black silicon based metal-semiconductor-metal photodetector, the black silicon layer, as a light-sensitive area, can respond to ultraviolet, visible and near infrared light.

The invention relates to a technology for recovery and zero emission of boiled off gas generated during liquefied gas evaporation, in particular to a liquefied natural gas boiled off gas recovery device and method. BOG is recovered in the form of gas hydrate, secondary flash vaporization generated in the re-condensation technology can be well avoided, loads of the device are lessened, and energy consumption is saved. According to the amount of the generated BOG, part of LNG or part of the BOG is used for providing cold energy needed in the gas hydrate reaction process and the storage process, no external refrigerating device is needed, energy consumption is saved, the conditions needed in gas hydrate reaction are much more temperate than the conditions needed in re-condensation, the requirements for the device and materials are easy to reach, cost is saved, and relative safety is achieved. The BOG is used for replacing nitrogen and used as a thermal insulation layer of a storage tank, and the cold energy of the gas is fully utilized; meanwhile, the BOG can conduct precooling on water needed in the gas hydrate reaction process, the cold energy of the part of BOG before the part of BOG enters a compressor is fully utilized, and the low temperature resistant requirement of the compressor is also reduced.

The invention relates to an oxygen-vacancy tungsten oxide/carbon nitride composite photocatalyst and a preparation method and application thereof. The preparation method of the composite photocatalystcomprises the following steps of: S1, adding carbon nitride powder in a hydrochloric acid solution for protonation treatment, performing continuous stirring, and then conducting filtration, washing and drying; S2, dispersing the protonated carbon nitride powder in anhydrous ethanol or water for ultrasonic treatment, and then adding tungsten hexachloride for a hydrothermal reaction; and S3, collecting the product of the hydrothermal reaction, and performing washing, drying and grinding to obtain the oxygen-vacancy tungsten oxide/carbon nitride composite photocatalyst. According to the oxygen-vacancy tungsten oxide/carbon nitride composite photocatalyst and the preparation method and application thereof, doping treatment is performed on carbon dioxide by adopting oxygen-vacancy WO2.72 as adoping semiconductor, more active sites can be provided by the oxygen-vacancy structure of the tungsten oxide in a photocatalytic reaction, and meanwhile the oxygen-vacancy tungsten oxide/carbon nitride (WO2.72/C3N4) composite material has a larger energy gap and a wider range of response to sunlight.

The invention discloses a humidity sensor based on graphene oxide/graphene/silicon and a preparation method thereof, wherein the humidity sensor comprises an n-type silicon substrate, a silicon window, a silicon dioxide insulation layer, graphene, graphene oxide, a top electrode and a bottom electrode. A graphene/silicon schottky junction in the humidity sensor is high in multiple transmission speed and is sensitive in reaction, and meanwhile, because that graphene is high in transparence, is high in electric conductivity and heat conductivity and is high in mechanical strength, the humidity sensor is available in various special applications under ultra-common conditions. By means of the graphene oxide as a humidity sensitive layer, electrical characters of the graphene/silicon schottky junction are influenced. The humidity sensor having such structure is simple to manufacture, allows quick and simple measurement, is high in sensitivity, can be used for manufacturing an integrated sensor through combination of mature semiconductor silicon technologies in a packaging manner. The humidity sensor has significant market prospect.

The invention provides a femtosecond laser ablation-based infrared-enhanced Si-PIN detector and a preparation method thereof. The detector comprises an intrinsic silicon substrate, a femtosecond laser ablation microstructure layer, an infrared-enhanced amorphous silicon-ruthenium alloy film, a lower electrode, a P-type region, an annular P+ type region and an upper electrode, wherein the femtosecond laser ablation microstructure layer is a micron sharp cone array. The unabsorbed light which transmits through a space charge region is reflected for multiple times; a light propagation path and the photo capture ratio are increased; absorption and utilization of the light are improved; more photo-induced carriers are excited; the responsivity of the detector is improved; a relatively narrow optical band gap is obtained through controlling the ruthenium content; and the band gap of a silicon material is narrowed, so that near-infrared light with lower energy and a larger wavelength is captured; absorption of the near-infrared light can be additionally increased; and the detection spectrum range of a photoelectric detector is expanded.

The invention provides a dielectric layer, an ion capacitive flexible tactile sensor and a preparation method and application thereof. The surface of the dielectric layer is provided with at least twoprojection structures of different micrometer sizes, the surface of the dielectric layer is further provided with a groove structure, and the groove structure is used for bearing the projection structures pressed under the action of pressure; the dielectric layer is provided with a hierarchical self-filling microstructure, so that the dielectric layer shows a relatively wide squeezability and deformability within a super-wide pressure range; the dielectric layer is applied to the capacitive flexible tactile sensor, so that the sensor has higher sensitivity, a wider response range, a lower detection limit, the shorter response time, better stability and extremely high pressure resolution; and the dielectric layer has great application prospects in the fields of robotics, human health monitoring, high-pressure sensing and the like.

The invention provides a nano enzyme with a nanometer cage core of a hollow gold-platinum alloy and a shell of a porous silicon dioxide, a preparation method and an application thereof, and belongs tothe field of nanometer materials. The preparation method comprises the following steps: etching a gold core platinum shell nanostructure through potassium hexachloroplatinate to obtain a nanocage ofhollow gold-platinum alloy; coating silicon dioxide on the surface of the nanocage through tetraethyl silicate; and obtaining the nano enzyme taking the nanometer cage, in a round rod shape, of the hollow gold-platinum alloy as a core, and a silicon dioxide shell as the periphery of the core. The length of the core is 80 to 100 nm, and the diameter is 20 to 25 nm. The shell is provided with a channel of 3 to 5 nm. The nano enzyme is negatively charged. The antigen can be bound by an attractive effect of positive and negative electric charges to form a nano enzyme label antigen complex, which is used for performing enzyme linked immunoassay. According to the nano enzyme with the nanometer cage core of the hollow gold-platinum alloy and the shell of the porous silicon dioxide, the preparation method and the application thereof, the cost of a reagent of the natural enzyme label antigen complex is reduced, the working environment of enzyme linked immunodetection is extended, the defects that the natural enzyme is easy to deactivate and denature, etc., are overcame, and the nano enzyme can be widely applied to various enzyme linked immunodetection.

The invention discloses a copper sulfide/bismuth vanadate heterojunction photocatalyst and a preparation method thereof. The copper sulfide/bismuth vanadate heterojunction photocatalyst comprises a copper sulfide and bismuth vanadate, and the copper sulfide is attached to the bismuth vanadate. The preparation method comprises the following steps: preparing a suspension of bismuth vanadate and copper nitrate; preparing a suspension liquid of bismuth vanadate, copper nitrate and sodium thiosulfate; carrying out water bath reaction on the suspension liquid of bismuth vanadate, copper nitrate andsodium thiosulfate to obtain the copper sulfide/bismuth vanadate heterojunction photocatalyst. The copper sulfide/bismuth vanadate heterojunction photocatalyst has the advantages of being wide in visible light response range, high in quantum efficiency, high in photocatalytic activity and the like, is a novel semiconductor photocatalytic material, and has good application value and application prospect, the catalyst prepared by the preparation method is high in crystallization degree, free of impurities in the preparation process, simple in process, mild in reaction conditions, convenient to operate, clean, pollution-free and the like, is suitable for large-scale preparation, and is convenient for industrial utilization.

The invention discloses a g-C3N4-TiO2 heterojunction photocatalyst and a preparation method of the g-C3N4-TiO2 heterojunction photocatalyst. The method comprises the following steps: calcining melamine at the high temperature to obtain g-C3N4; mixing the obtained g-C3N4 with TiO2, preparing the g-C3N4/TiO2 heterojunction photocatalyst through a sol-hydrothermal solution method; enabling the obtained g-C3N4/TiO2 to react under the action of a water reducer to obtain the g-C3N4-TiO2 heterojunction photocatalyst. The g-C3N4-TiO2 composite catalyst has a compact heterojunction structure, and is relatively high in light current responsiveness under the illumination condition, and the heterojunction structure effectively inhibits the recombination of a photo-induced electron and an electron hole. Moreover, the raw materials of the preparation method are easy to get, the cost is low, the reaction condition is mild, and the preparation method does not pollute the environment and has a better application prospect.

The invention discloses a cascade microsphere resonant cavity type humidity sensor. The sensor comprises a sensor base, wherein a transverse mounting groove a and a longitudinal mounting groove b which are perpendicular to each other are formed in the sensor base; a fused optic fiber is arranged in the transverse mounting groove a through a fused optic fiber leftward adjusting screw and a fused optic fiber rightward adjusting screw; a left optic fiber wire jumper protection sleeve and a right optic fiber wire jumper protection sleeve are respectively arranged at the left and right ends of the fused optic fiber; a single-mode optic fiber is arranged in the longitudinal mounting groove b through a single-mode optic fiber adjusting screw; and the single-mode optic fiber is arranged relative to the a tapered zone of the fused optic fiber. The sensor is wide in humidity response range and high in sensitivity coefficient, and compared with the traditional humidity sensor, the sensor has the advantages of small size, wide response range, high sensitivity and high stability, and can be applied to the fields of aerospace, meteorology, clinical medicine and civil engineering.

A conjugated fluorene polymer is provided, which is defined by structure formula (1), wherein: R₁, R₂, R₃, R₄ represent H or C₁-C₂₀ alkyl, x+y=1, x≠0, y≠0, n is a natural number between 1-1000, Ar₁ is a group containing thiophene. A preparation method for the conjugated fluorene polymer and a solar cell device containing the conjugated fluorene polymer are also provided. Due to fluorene or its derivatives and conjugated structure, the conjugated fluorene polymer exhibits an excellent light stability and thermal stability. In addition, since thiophene and benzothiadiazole groups are introduced into the main chain of the polymer, the spectral response range of the polymer is broadened.

The invention belongs to the technical field of polymer hydrogel preparation, and particularly relates to a preparation method of zwitterionic polymer hydrogel and an application of the zwitterionic polymer hydrogel in a biosensor. The zwitterionic polymer hydrogel provided by the invention comprises the following components: a zwitterionic polymer, carbon quantum dots and glucose oxidase, the preparation method of the zwitterionic polymer hydrogel is simple, and the application of the hydrogel in the field of biosensors is facilitated. The carbon quantum dots and the glucose oxidase are further encapsulated in the zwitterionic polymer hydrogel through hydrogen bond bonding to prepare pH-sensitive enzyme-containing hydrogel, so that the hydrophobic active sites of the enzyme can be effectively prevented from being interfered. A constructed biosensor can respond to and detect pH and glucose at the same time, and is wide in response range and high in sensitivity.

An orthodontic ligature to be applied in fixed appliance orthodontic treatments, such as dental braces (also known as orthodontic braces), that eliminates friction at an archwire/bracket interface by forming a channel between a bracket and a ligature, an archwire being displaced in the channel, so as to facilitate tooth movement.

The invention discloses a PBN-type InGaAs infrared detector, and belongs to the technical field of optoelectronic materials and devices. The invention solves a technical problem that an InGaAs detector has more dark currents in the prior art, thereby further enlarging the response range of the InGaAs detector. The detector consists of a window layer, a blocking layer, an absorption layer, a buffering layer and a substrate, wherein the window layer, the blocking layer, the absorption layer, the buffering layer and the substrate are sequentially arranged from the top to the bottom. The blocking layer is made of an Si-doped InAlAs material or Si-doped InAsP material which is larger in energy gap than the absorption layer and the window layer and is matched with the absorption layer in crystal lattice. The thickness of the blocking layer is from 100 nm to 300 nm. The detector can prevent the generation of the dark currents well, is high in quantum efficiency, is low in surface recombination, is wider in response range, and can be used for remote detection.

The invention discloses a preparation method and application of a bismuth-titanium-iron oxide chloride photocatalytic material, and belongs to the technical field of photocatalytic material preparation processes. The preparation method comprises the following steps: adding bismuth nitrate pentahydrate into an ethylene glycol solution, dropwise adding distilled water containing potassium chloride into an obtained solution at the speed of 1-2 drops per second, stirring for 1 hour at room temperature, then centrifugally washing, and finally putting a cleaned sample into a drying oven for drying to obtain bismuth oxychloride nanosheets; mixing and grinding bismuth oxide, titanium dioxide, ferrous oxide and the bismuth oxychloride nanosheets according to a standard stoichiometric ratio, and calcining in a muffle furnace at 973-1173 K for 12 hours; and after the temperature is reduced to room temperature, taking out the calcined sample, and further grinding. The method has the advantages ofsimple process, easiness in operation, visible light response, low energy consumption and the like; the material has very strong pollutant degradation capacity under visible light, and has wide application prospects in the fields of pollutant treatment, photocatalytic oxygen production and the like.

The invention relates to the technical field of complexes, in particular to a ruthenium polymer, a preparation method thereof and a pH value detection fluorescent probe. The invention discloses a ruthenium polymer with a chemical formula as shown in a formula (I). The ruthenium polymer is novel in structure, good in luminescence characteristic, excellent in optical property, long in excited state service life, sensitive to pH response, wide in response range and wide in linear range, and is particularly obvious when the pH is 4-8. The ruthenium polymer can be used for sensitively detecting the change of the pH level in a living body by utilizing a fluorescence technology, can be used as a novel fluorescent polymer probe, and is applied to the field of fluorescent biological imaging in life science research.

The invention discloses a preparation method and application of a piezoelectric-triboelectric coupling induction material, and the preparation method comprises the following steps: S1, dissolving hydroxy propyl cellulose, chitosan and carbon nanotubes in an acidic solution to prepare a hydroxy propyl cellulose/chitosan/carbon nanotube solution; and S2, casting the hydroxy propyl cellulose/chitosan/carbon nanotube solution on a polytetrafluoroethylene substrate, and drying to obtain the piezoelectric-triboelectric coupling sensing material. According to the sensing material, the HPC, the CTS and the CNT are adopted to prepare the positive electrode of the piezoelectric-triboelectric coupling sensing material through a tape casting method, and a film with piezoelectric performance is also prepared, so that the sensing material has excellent mechanical performance and signal conversion performance.