8 results about "Graphene monolayer" patented technology

The invention relates to the technical field of electrochemical energy storage, and discloses a negative electrode material preparation method, a performance prediction method, a negative electrode material and a battery, and the negative electrode material preparation method comprises the following steps: constructing a graphene single-layer structure model; performing boron doping on the graphene single-layer structure model to construct a boron-doped graphene single-layer structure model; and constructing an adsorption model of lithium atoms on specific sites of the boron-doped graphene single-layer structure model. By doping boron atoms into the graphene material, the electronic structure and inherent properties of the boron-doped graphene are effectively regulated and controlled, and the dynamic process of an interface chemical reaction is further remarkably influenced, so that the electrochemical performance is greatly improved, the boron-doped graphene still keeps a planar structure, and the boron-doped graphene is good in structural stability. After the boron-doped graphene adsorbs lithium, the adsorption energy is gradually reduced and is smaller than the cohesive energy of lithium atoms, so that dendritic crystals can be inhibited by boron doping.

The application belongs to the technical field of modified graphene oxide, and provides a polysiloxane modified single-layer graphene oxide and a preparation method thereof. The method comprises the following steps: mixing single-layer graphene oxide, hydrogen-containing polysiloxane, an organic solvent and a catalyst, and performing a reaction to obtain the polysiloxane modified single-layer graphene oxide. The silicon hydrogen bond in the hydrogen-containing polysiloxane is used to perform a condensation reaction with the hydroxyl group in the single-layer graphene oxide, so that the single-layer graphene oxide is modified, and the method has the advantages of high reaction activity, short reaction time and no by-products except hydrogen. The polysiloxane modified single-layer graphene oxide prepared by the application has macromolecular polysiloxane grafted on the surface of the single-layer graphene oxide, and the single-layer graphene oxide modified by the macromolecular polysiloxane has better hydrophobicity than that modified by a small-molecule silane modifier. In addition, the application can accurately control the molecular weight of the polysiloxane grafted on the surface of the single-layer graphene oxide, and has a wide application prospect.

This disclosure generally relates to graphene-based diagnostic sensor devices. More particularly, the disclosure relates to graphene-based diagnostic sensor devices for the multiplex detection of target nucleic acids in fluid samples, including biological fluid samples. In certain aspects, the graphene-based multiplex diagnostic devices disclosed herein comprise a graphene-based FET sensor array chip, wherein each sensor in the array comprises an independent sensing regions, each sensing region having a nucleic acid probe attached to a graphene monolayer, for hybridizing and detecting a target nucleic acid.

The application provides a method for preparing graphene from needle coke, and belongs to the technical field of graphene preparation. The method comprises the following steps: 1) mixing needle coke, a strong oxidizing agent and a solvent, and performing ultrasonic treatment on the mixture to obtain an ultrasonic material; 2) performing high-temperature and high-pressure treatment on the ultrasonic material, and instantaneously releasing pressure after the high-temperature and high-pressure treatment is completed to obtain exfoliated needle coke; and 3) performing vacuum microwave treatment on the exfoliated needle coke to obtain graphene. The method provided by the application is simple in process, suitable for industrial production, and can prepare graphene with a high single-layer rate and good quality.

The application belongs to the technical field of lithium-sulfur batteries, and relates to a nitrogen-doped graphite-like intercalated MoS2 heterostructure and a preparation method and application thereof. The preparation method is as follows: after molybdenum salt and thiourea are completely dissolved in deionized water or ultrapure water, polyethylene imine is added, and the mixture is stirred to obtain a mixed solution; the mixed solution is subjected to a hydrothermal reaction to obtain a precipitate; the precipitate is washed, centrifuged and dried for multiple times to obtain a MoS2 / PEI composite material; the MoS2 / PEI composite material is subjected to annealing treatment at 550 DEG C to 850 DEG C for 2 h to 10 h under the protection of argon to obtain a MoS2 / g-CM heterostructure. The application successfully constructs and systematically verifies that the nitrogen-doped graphite-like single-layer carbon inserted into the interlayer of MoS2 forms a heterostructure as a multifunctional catalyst and interface regulation material for high-performance lithium-sulfur batteries. On the premise of ensuring excellent catalytic properties, the conductivity is improved, and the defects of active site scarcity and easy collapse of the layered structure are overcome.

A TM polarization three-band tunable spectrum selective absorber based on a guided mode resonance effect comprises a graphene single layer, a hexagonal lattice point nanopore array, a dielectric medium thin film layer, an antireflection thin film layer and a dielectric medium substrate from top to bottom, and the nanopore array is composed of a two-dimensional periodic hexagonal lattice point nanopore array. Under vertical incidence of TM polarized light, incident light in three narrow frequency ranges can be absorbed, an absorption spectrum is subjected to micro-frequency shift along with structural parameters and incident angles, but the absorption rate at each peak frequency is higher than 30%, and the full width at half maximum is smaller than 0.005 THz; by adjusting the Fermi level of the graphene, the absorption performance can be dynamically tuned in a large frequency range. The TM polarization three-band tunable spectrum selective absorber is processed by combining an electron beam direct writing device with a micro-electronic deep etching process, is convenient in material taking and low in manufacturing cost, can be produced on a large scale, and has important practical prospects.

This disclosure generally relates to graphene-based diagnostic sensor devices. More particularly, the disclosure relates to graphene-based diagnostic sensor devices for the multiplex detection of target nucleic acids in fluid samples, including biological fluid samples. In certain aspects, the graphene-based multiplex diagnostic devices disclosed herein comprise a graphene-based FET multiplex sensor array having multiple independent sensors, each having a nucleic acid probe, for hybridizing and detecting a target nucleic acid, attached to a graphene monolayer.