96results about How to "Facilitate charge transfer" patented technology

A photon detector is obtained by using the intersubband absorption mechanism in a modulation doped quantum well(s). The modulation doping creates a very high electric field in the well which enables absorption of input TE polarized light and also conducts the carriers emitted from the well into the modulation doped layer from where they may recombine with carriers from the gate contact. Carriers are resupplied to the well by the generation of electrons across the energy gap of the quantum well material. The absorption is enhanced by the use of a resonant cavity in which the quantum well(s) are placed. The absorption and emission from the well creates a deficiency of charge in the quantum well proportional to the intensity of the input photon signal. The quantity of charge in the quantum well of each detector is converted to an output voltage by transferring the charge to the gate of an output amplifier. The detectors are arranged in the form of a 2D array with an output amplifier associated with the entire array or a row of the array as in the known charge coupled devices, or a separate amplifier could be dedicated to each pixel as in the known architecture of the active pixel device. This detector has the unique advantage of near room temperature operation because the dark current is limited to the generation across the semiconductor bandgap and not the emission over the quantum well barrier. The detector also has the advantage that the readout circuitry is implemented monolithically by the HFETs formed in the GaAs substrate simultaneously, with the detecting elements.

The invention discloses a cobalt/nitrogen-codoped nitrogen-carbon-material-carrier-carried nano nickel iron nitride composite material. The composite material uses a cobalt/nitrogen-codoped nitrogen carbon material as the carrier, and iron nickel nitride nanoparticles are carried in situ on the surface of the cobalt/nitrogen-codoped carbon material. The preparation method comprises the following steps: protecting a zeolite imidazate framework structure material precursor by using silicon dioxide to obtain the high-dispersity carbon-base nanoparticle material, and growing nickel iron hydrotalcite in situ on the carbon material, and calcining to obtain the cobalt/nitrogen-codoped nitrogen-carbon-material-carrier-carried nano nickel iron nitride composite material. The cobalt/nitrogen-codoped nitrogen-carbon-material-carrier-carried nano nickel iron nitride composite material has excellent activity in catalyzing oxygen redox reaction, and can be used as a high-efficiency zinc-air battery negative pole material.

The present disclosure provides a method of fabricating a nanoporous thin film device comprising depositing a template on a substrate to form a nanoporous insulating layer, the template comprising one or more polymers capable of forming pores when polymerized and at least one cross-linking agent, and depositing a second layer (e.g. organic semiconductor, semiconductor, insulator) on the nanopourous insulating layer to form a thin film having a plurality of isolated nanopores on the surface. Nanoporous semiconductor thin films made by these methods is provided. Sensors and devices comprising the nanoporous thin film is also disclosed.

The invention discloses a preparation method of a superfine cadmium sulfide particles-sensitized titanium dioxide nanotube array, comprising the following steps of: 1) pretreating the surface of a substrate material, carrying put anodic oxidation to obtain pure TiO2-NTs by taking mixed solution of NH4F and H3PO4 as electrolyte, taking a Ti slice as a working electrode Pt slice and a counter electrode,, and roasting an obtained sample, to obtain an anatase type TiO2-NTs thin film; and 2) ultrasonically treating the sample obtained in the step 1), carrying out electro-deposition by taking CdCl2 as electrolyte to obtain Cd/TiO2-NTs, carrying out roasting and thermal oxidation to obtain CdO, carrying out ion exchange in Na2S solution, and withdrawing to obtain CdS/TiO2-NTs. In combination with the electro-deposition and the ion exchange, the superfine CdS particles are evenly dispersed at the tube opening of the TiO2 nanotube array and in the tube, so that the effective contact area between the CdS particles and the TiO2 nanotube array can be increased, therefore, the charge transfer among interfaces can be increased, the photoelectric conversion efficiency is higher, and the activity of the photo-electrically and catalytically degraded organic pollutants can be improved.

Methods for generating electric power and a discharge fluid from an oxidant and a reducer using a discharge system, and regenerating an oxidant and/or the reducer from the discharge fluid using a regeneration system are provided. A discharge unit of the discharge system generates electric power and the discharge fluid by transferring electrons from a positive electrode of a 5-layer electrolyte-electrode assembly (5EEA) to an aqueous multi-electron oxidant (AMO) and from a reducer to a negative electrode of the 5EEA. The regeneration system neutralizes the discharge fluid to produce a salt form of the discharge fluid. The regeneration system electrolyzes the salt form of the discharge fluid into an intermediate oxidant in an electrolysis-disproportionation reactor and releases the reducer, while producing the AMO by disproportionating the intermediate oxidant. The regeneration system converts a salt form of the AMO into an acid form of the AMO in an ion exchange reactor.

Periodic nanostructures for high energy-density and high-power density device and systems and uses thereof. Hierarchical nanostructured materials having stacked polymer nanowires forests interconnected by monolayer graphene sheets were fabricated through bottom-up nanofabrication. Driven by external voltage, aniline molecules and graphene oxide were alternatively assembled for hierarchical porous stacked nanostructures while graphene oxide was in-situ reduced to graphene during the assembly process. As-produced hierarchical nanostructures can be used as supercapacitor electrodes, which can utilize the discovered stack-dependent device properties.

The invention provides a preparation method of a carbon fiber interpenetrating micro heterojunction carbon nitride photocatalyst, the method comprises the following steps: taking melamine and urea asprecursors, preparing micro heterojunction g-C3N4 by a thermal condensation method, and stripping massive g-C3N4 by using oxygen as an etching gas to obtain flaky g-C3N4; mixing nano cellulose and theflaky g-C3N4, and performing heat treatment in a tube furnace under the protection of argon to obtain the carbon fiber interpenetrating micro heterojunction carbon nitride photocatalyst; putting thecarbon fiber interpenetrating micro heterojunction carbon nitride photocatalyst in a mixed solution of water and ethanol to prepare hydrogen peroxide under visible light irradiation, wherein the content of the hydrogen peroxide is tested by a POD/DPD method. The product prepared by the method has the advantages of good conductivity, large specific surface area, high photocatalytic reaction activity, high charge carrier transmission efficiency and the like, is an environment-friendly photocatalytic material, and can be used for preparing the hydrogen peroxide through photocatalysis under visible light.

The invention belongs to the technical field of composite materials. The invention provides an MOFs/water hyacinth derivative material, a preparation method thereof and a degradation method of organic pollutants. The MOFs/water hyacinth derivative material is composed of water hyacinth biochar and a cobalt-based zeolite imidazate framework embedded in the water hyacinth biochar. The water hyacinth biochar is used as a carrier of the MOFs material, and the prepared MOFs/water hyacinth derivative material has excellent stability, conductivity and specific surface area, and is more beneficial to charge transfer and mass transfer processes between cobalt active sites and pollutants; and due to the pore limiting effect of the water hyacinth biochar, crystal growth of the MOFs derivative metal oxide in the thermal decomposition process can be effectively limited. The MOFs/water hyacinth derivative material disclosed by the invention has strong capability of activating persulfate to generate free sulfate radicals, so that the MOFs/water hyacinth derivative material has efficient and lasting capability of catalytically oxidizing organic matters, and the defects that a catalyst is easy to agglomerate, the activation time of persulfate is long and the like are effectively overcome.

The invention relates to an antimony-cerium modified molybdenum disulfide/indium oxide quaternary gas sensitive material and a preparation method thereof, and belongs to the field of sensor gas sensitive material preparation. The gas sensitive material is prepared from antimony elements, cerium elements, molybdenum disulfide and indium oxide, wherein indium oxide particles are attached to the surface of molybdenum disulfide sheet layer to form a MoS2/In2O3 nanometer compound body; antimony and cerium atoms are positioned in crystal lattices of the MoS2/In2O3 nanometer compound body. The preparation method comprises the following steps that (1) a MoS2/In2O3 nanometer composite material is synthetized by a hydrothermal method; (2) in protection atmosphere, an antimony source, a cerium sourceand the MoS2/In2O3 nanometer composite material are subjected to hydrothermal reaction, centrifugation, drying and calcination; the antimony-cerium modified molybdenum disulfide/indium oxide quaternary gas sensitive material is obtained. Through the instruction of antimony and cerium, the chemical adsorption activation energy of gas to be tested is effectively reduced; the specific surface area and the electric conductivity of the indium oxide semiconductor gas sensitive material are greatly improved; the charge transfer between gas molecules and materials is enhanced; the excellent gas sensitive material is obtained.

The invention provides an in-situ lithium supplementing and battery manufacturing method for a flexible package lithium ion battery. The in-situ lithium supplementing and battery manufacturing method comprises the following steps: 1, preparing a positive plate and a negative plate; 2, preparing a battery roll core or a pole piece cluster from the positive pole piece, the negative pole piece and the diaphragm, wrapping the battery roll core or the pole piece cluster with a lithium-rich auxiliary electrode of which the surface is wrapped with an isolating membrane, and assembling into a soft package battery; 3, injecting electrolyte into the soft package battery obtained in the step 2, and performing pre-lithiation after primary sealing; and 4, taking out the lithium-rich auxiliary electrode after the pre-lithiation is completed, performing activation after secondary sealing, and performing vacuumizing treatment and tertiary sealing after activation. By presetting the lithium-rich auxiliary electrode, in-situ pre-lithiation of the negative electrode of the lithium ion battery is realized, so that the energy density of the lithium ion battery is improved. And lithium in the pre-lithiation process mainly comes from the pre-lithiation agent on the lithium-rich auxiliary electrode, so that the influence on the electrolyte is very small, and the pre-lithiation process is simple, safe and efficient.

The invention discloses a graphite felt composite electrode and a preparation method thereof. The preparation method comprises the following steps: s1, pretreating a graphite felt electrode; s2, preparation of a carboxylated carbon nanotube-polydopamine compound: mixing carboxylated carbon nanotubes subjected to ultrasonic oscillation dispersion in deionized water with dopamine to obtain a mixed solution, adjusting the pH value of the mixed solution to 8.0-8.5 to obtain a carboxylated carbon nanotube-polydopamine compound, wherein the mass ratio of the carboxylated carbon nanotubes to the dopamine is 4: 8-4: 10; s3, preparing a graphite felt composite electrode: dispersing a carboxylated carbon nanotube-polydopamine compound into an organic dispersant to form a uniform and stable suspension; soaking the graphite felt into the suspension to modify the carboxylated carbon nanotube-polydopamine compound on the graphite felt, performing cleaning and drying, putting the graphite felt into atubular furnace, and performing carbonizing for 2-5 hours under the vacuum condition of 700-900 DEG C to obtain the carbon nanotube-polydopamine composite material.

The invention discloses a chemical enhancement SERS substrate preparation method for regulating oxide defects. The method comprises the steps that a hydrothermal synthesis method is used for synthesizing MoO2 nanosphere powder; and 2, 2wt%, 4wt%, 6wt% and 8wt% of lithium powder is added, and MoO2-x(0<x<1) materials with different oxygen-rich vacancy defect concentrations are obtained. According tothe MoO2-x spherical nano-materials, the average particle diameter is 70 nm, the detection limit of an SERS substrate prepared by regulating the oxide defects through lithium reduction on R6G can reach 10<-7> M, and the introduced oxygen vacancy concentration can be regulated through the mass ratio of the added lithium powder, and therefore the Raman enhancement effect of the oxide SERS substrateis controllably enhanced. The preparation method is simple and convenient, obtained materials are uniform in morphology, the Raman enhancement effect is excellent, and great potential in enhancing the Raman enhancement effect of the oxide SERS substrate is achieved.

The invention provides a manufacturing method of a high-energy-density aluminum shell lithium ion battery, which comprises the following steps: S1, preparing a positive plate and a negative plate, assembling an aluminum shell battery, keeping insulation between the aluminum shell and the positive plate and the negative plate of the battery, and then injecting a pre-lithiation electrolyte into the aluminum shell battery; S2, connecting the aluminum shell with the positive electrode of an external power supply, connecting the negative plate with the negative electrode of the external power supply, and charging with small current for pre-lithiation; and S3, removing the pre-lithiated electrolyte, injecting a functional electrolyte, and then performing activation and sealing to obtain the high-energy-density aluminum shell lithium ion battery. According to the method, in-situ lithium pre-embedding of the negative electrode of the lithium ion battery can be accurately controlled, so that lithium consumption in the processes of negative electrode film forming and the like in the first-time charging process is compensated, gram volume exertion of the positive electrode material in the actual lithium ion battery is improved, and due to the fact that additional auxiliary electrodes or electrode materials do not need to be added in the lithium pre-embedding process, andoperation is simple and convenient. And the capacity and the energy density of the lithium ion battery can be improved.