60results about How to "Improve light responsiveness" patented technology

An oxygen-quenching luminophore constituting part of a pressure-sensitive luminophore is directly bonded by a covalent bond to an organic polymer compound having trimethylsilyl groups, so the luminophore molecules are retained in the polymer and free aggregation is inhibited when the organic solvent is evaporated. It is therefore possible to prevent light response from being reduced by the aggregation of the luminophore molecules during evaporation of the organic solvent, which is a drawback of forming films from conventional mixed-type pressure-sensitive paints. A thin-film sensor with uniform characteristics can be formed by spraying or application from a pressure-sensitive paint obtained by mixing a functional polymer with a solvent. In addition, a coating solution that has high reproducibility and is suitable for spraying or application can be obtained merely by dissolving the functional polymer as a single component in a suitable solvent. It is possible to obtain a functional polymer, a pressure-sensitive paint, and a pressure-sensitive element in which a reduction in light response due to luminophore aggregation can be prevented, and a thin sensor film having uniform characteristics can be formed, even when the organic solvent has evaporated.

An optically driven actuator includes a crosslinked polymer obtained by crosslinking at least part of the side chains of a condensation polymer having, on its backbone chain, a photoisomerizable group that undergoes structural change under optical stimulation. The crosslinked polymer deforms reversibly depending on optical stimulation, thereby performing the function of an actuator.

A diode is described which comprises a light-sensitive germanium region (5) located on a waveguide (2) made of silicon or silicon germanium and which has lateral dimensions in a direction transverse to a direction of light propagation in the waveguide that are identical or at most 20 nm per side shorter in comparison with the waveguide.

An optically-driven actuator includes a condensation polymer containing, on its backbone chain, a photoisomerizable group that undergoes structural change under optical stimulation and deforming depending on the structural change of the photoisomerizable group. The condensation polymer deforms under optical stimulation and is functional as an actuator.

The invention belongs to the field of photocatalysts, and provides a cobalt titanate doped titanium nitride photocatalyst for hydrogen production and a preparation method. The preparation method comprises the following steps: firstly, putting titanium dioxide nanotubes and metal magnesium particles in a reaction kettle for carrying out high-temperature reaction in a nitrogen atmosphere, thus obtaining titanium nitride; then, adding the titanium nitride into an aqueous solution prepared from deionized water and ethanol, thus forming a suspension solution; finally, adding cobalt titanate into the suspension solution, and carrying out centrifuging, filtering and drying/laser sintering after stirring reaction, thus obtaining the cobalt titanate doped titanium nitride composite photocatalyst. According to the preparation method disclosed by the invention, by utilizing the advantages of narrower band gap and good photo-responsiveness in a visible light zone of the cobalt titanate, a p-n heterojunction photocatalyst is formed by compounding the cobalt titanate with the titanium nitride, so that the photo-responsiveness of the titanium nitride is broadened, the photocatalytic efficiency ofthe titanium nitride is increased, and the hydrogen production efficiency is also increased.

A photoreceptor for electrophotography includes a photosensitive layer provided on a conductive substrate that contains at least a resin binder, a charge transport material, and an additive. The photoreceptor exhibits high photoresponsivity, stable electrical properties regardless of repeated use thereof, and high durability. The resin binder contains a polycarbonate resin composed of a copolymer having structural units expressed by general formulae (1) and (2) below. The charge transport material contains at least one type of stilbene compound expressed by general formulae (3), (4), and (5) below. The additive contains at least one type of diester compound expressed by general formula (6) below.

In a graphene-semiconductor heterojunction photodetector and a method of manufacturing the same according to the present inventive concept, a source electrode and a test electrode are formed to face each other on a graphene layer, and a drain electrode is formed in a direction perpendicular to a central region portion of the graphene layer, so that the drain electrode may be physically separated from the graphene layer. Further, charges formed at the central region portion of the graphene layer are transmitted to the drain electrode through a substrate, so that high photosensitivity may be secured, and a high output voltage may be secured for the applied light. Accordingly, the drain electrode is formed at a side surface of the graphene layer, so that the size of the drain electrode may be easily controlled, and a high output voltage may be obtained.

The invention relates to a magnetic lanthanum-iodine co-doped photocatalyst composite material and a preparation method thereof. The composite material is prepared by the following method: using ferroferric oxide nanoparticles as a magnetic core and using ethyl orthosilicate as a silicon source, coating the surface of the ferroferric oxide nanoparticles with a porous active silicon layer to obtaina porous magnetic carrier by using a sol-gel method, then using titanate as a titanium source and iodic acid as a raw material, and baking to obtain a precursor; and then adopting a precipitation-impregnation method, using lanthanum nitrate as a raw material, and preparing lanthanum-iodine co-doped visible-light catalytic magnetic porous titanium dioxide composite microspheres, namely the magnetic lanthanum-iodine co-doped photocatalyst composite material. According to the lanthanum-iodine co-doped photocatalyst composite material prepared by the fractional step method, lanthanide iodine andanatase titanium dioxide can be simultaneously doped and are attached to the magnetic matrix, and not only can the light response ability of the material be improved, but also the recycling capacity of the catalyst can be enhanced.

The invention relates to a magnetic tungsten doped photocatalyst composite material and a preparation method thereof. The preparation method of the composite material comprises the following steps: coating the surface of a ferroferric oxide nanoparticle used as a magnetic core with a porous active silicon layer through a sol-gel technology with tetraethyl orthosilicate as a silicon source, and preparing a WOx doped visible light catalyzed magnetic porous titanium dioxide composite microsphere which is the magnetic tungsten doped photocatalyst composite material through a mixed sol technology with titanate as a titanium source and tungsten tungstate as a tungsten source. The tungsten doped magnetic composite material prepared step by step can be simultaneously doped with tungsten and anatase titanium dioxide, and can be attached to a magnetic matrix, so the light response capability of the material is improved, and the recycling capability of the obtained catalyst is enhanced.

The present invention discloses a photoelectric detector with a two-dimensional transition metal sulfide film nanoscroll, which is made by the following steps: firstly depositing ammonium tetrathiomolybdate on a silicon/silica substrate by a bubbling method, then growing monolayer disulphide on the surface of the substrate by a thermal decomposition method, afterwards putting a drop of ethanol solution gently on one side of the disulphide film, resulting in spontaneous curling of the disulphide film to form the nanoscroll helix structure since volatilization of the ethanol solution produces atemperature gradient and a surface tension gradient at interface contact, finally depositing gold electrodes on both sides of the nanoscroll by a thermal evaporator and connecting the gold electrodesat both sides by the nanoscroll to obtain the photoelectric detector based on the two-dimensional transition metal sulfide film nanoscroll (TMDC-NSs) helix structure. The photoelectric detector of thepresent invention has short photoresponse time, fast recovery time, good stability, low cost and controllability, large-scale production and great application value.

The invention provides a manufacturing method of a fluorine-containing graphene decorative layer organic field effect transistor, and belongs to the field of semiconductor material devices. The manufacturing method is characterized in that fluorine-containing graphene is used as a decorative layer, organic semiconductor materials are used as a semiconductor layer, and the organic field effect transistor of a bottom-gate and bottom-electrode structure is manufactured. Through the manufacturing method, performance of the devices can be enhanced through the fluorine-containing graphene, the devices comprising the fluorine-containing graphene decorative layer with tri-isopropyl silicon acetylene substitution TIPSEthiotet and pentacene have high light responsiveness and sensibility.

The invention relates to a visible light photocatalyst, a modified PVDF ultrafiltration membrane and a preparation method and application thereof. In a Bi2MoO6/CuS visible light photocatalyst, the mass ratio of Bi2MoO6 to CuS is (20-100): 1, and CuS is dispersed on the surface of Bi2MoO6 to form hollow flower-shaped spheres; in the ultrafiltration membrane, PVDF is used as a matrix, and a Bi2MoO6/CuS nano photocatalyst is used as an active component; the ultrafiltration membrane is prepared from the following components in parts by weight: 17 to 19 parts of polyvinylidene fluoride, 2.5 to 3.5parts of polyvinylpyrrolidone, 77 to 79 parts of N, N-dimethylacetamide and 0.5 to 1.5 parts of Bi2MoO6/CuS nano photocatalyst. Compared with the prior art, the modified membrane provided by the invention is uniform in membrane pore distribution and good in photocatalytic activity, can generate hydroxyl radicals and oxygen anions with an oxidation effect on the surface of the membrane under the irradiation of visible light, and can kill attached bacteria and degrade attached organic pollutants, so that the formation of a biological membrane on the surface of the membrane can be remarkably inhibited, and a good membrane pollution control effect is achieved.

The invention discloses an infrared detector and a preparation method thereof. The infrared detector comprises a substrate, a graphene layer, a quantum dot layer and an interdigital electrode which are sequentially arranged from bottom to top, wherein the quantum dot layer comprises an inner core formed by lead sulfide and a shell layer formed by gold, the shell layer wraps the surface of the inner core, and the interdigital electrode is plated on the surface of the shell layer. The mixed nanostructure (namely the quantum dot layer) of the metal gold and the semiconductor lead sulfide can improve the photoelectric conversion efficiency of the device, and can significantly enhance the optical detection performance of the device.

The invention relates to a quantum dot modified titanium dioxide-based photo-anode. The photo-anode comprises a substrate, and a metal layer, a first titanium dioxide layer, an organic compound layer,a quantum dot layer and a second titanium dioxide layer which are sequentially arranged on the substrate. The first titanium dioxide layer and the quantum dot layer are stably combined together through the effect of the organic compound layer containing carboxyl and sulfydryl, the coverage rate of quantum dots is increased, and the photoresponse performance of the photoanode is improved. On the basis, a second titanium dioxide layer is introduced to form a sandwich energy band structure, so that the light absorption rate is improved, the utilization efficiency of photon-generated carriers inthe quantum dots is improved, and the light response performance of the photo-anode is further improved.

The invention discloses a preparation method of a near-infrared light response CuS/sulfur-doped carbon nitride (S-C3N4) heterojunction nanocomposite. CuS grows on the surface of S-C3N4 in situ through a hydrothermal method to prepare the CuS/S-C3N4 heterojunction nanocomposite. The preparation method comprises the following operation steps: preparing S-C3N4 by using urea and thioacetamide (TAA) as raw materials and distilled water as a solvent through a two-step heating method; and by taking S-C3N4, CuSO4. 5H2O and TAA as raw materials and distilled water as a solvent, growing CuS on the surface of S-C3N4 in situ by adopting the hydrothermal method to prepare the CuS/S-C3N4 heterojunction nanocomposite. The preparation method has the advantages that the process is simple, the operation is simple and convenient, the cost is low, and the obtained CuS/S-C3N4 heterojunction nano composite material greatly expands the light response capability of g-C3N4 in visible and near-infrared spectral regions and remarkably improves the activity of the CuS/S-C3N4 heterojunction nano composite material in degrading organic pollutants.

The invention relates to a polyvinylidene fluoride mixed matrix membrane with photocatalytic performance as well as preparation and an application thereof. A preparation method comprises the followingsteps: preparing a membrane casting solution from polyvinylidene fluoride, and blade-coating the membrane casting solution on a substrate; and putting the substrate with the membrane casting solutioninto a gel bath in which SnO2-Cu2O is dispersed, and realizing adhesion of SnO2-Cu2O on the surface of the matrix membrane through a delayed phase conversion process to obtain the polyvinylidene fluoride mixed matrix membrane. Compared with the prior art, the PVDF ultrafiltration membrane adhered with the SnO2-Cu2O photocatalyst prepared by the invention has higher hydrophilicity and remarkable photocatalytic performance compared with the traditional PVDF ultrafiltration membrane; Cu2O and SnO2 are combined to form a heterojunction structure, the photo-corrosion phenomenon of SnO2 is avoidedwhile the photo-response performance of Cu2O and SnO2 is improved, the electron transmission rate of Cu2O is increased due to addition of Cu2O, the visible light response capacity of SnO2-Cu2O is effectively promoted, the good anti-pollution effect is achieved under visible light irradiation, the membrane pollution phenomenon can be effectively reduced, and the reduction rate of the membrane fluxis reduced.