8 results about "Quantum size effect" patented technology

The invention discloses a YIG material for substrate surface sputtering and a preparation method thereof, and relates to the technical field of electronic information materials. The surface composite layer is composed of a main body crystal phase Y3Fe4.8Ta0. 2O12, HfO2 quantum dots distributed along a crystal boundary and a Br (at) ZrO2 core-shell structure, the interface transition area contains gadolinium ions, the particle size of the HfO2 quantum dots is set to be 3-5 nm, and the surface density of the HfO2 quantum dots is set to be 2 * 10 < 12 >-4 * 10 < 12 > / cm < 2 >. According to the method, the HfO2 quantum dots with the particle size of 3-5 nm are introduced to the grain boundary, grain boundary diffusion is limited through the quantum size effect, meanwhile, carboxyl functional groups on the surfaces of the HfO2 quantum dots are bonded with main body crystal phases, and therefore the local pinning effect can be formed, and the sputtering yield fluctuation of the yttrium element is compressed from + / -5.2% to + / -0.8%.

The application discloses a method for preparing a spectrum continuously adjustable perovskite-polymer composite film by femtosecond laser direct writing and application. The method comprises the following steps: preparing a perovskite precursor solution and coating to form a uniform wet film, and performing heating annealing under an inert atmosphere to obtain a perovskite precursor composite film; a femtosecond laser is used to perform focusing scanning in a line scanning mode, a spatial overlap is controlled to form a continuous and uniform heat field by adjacent pulses, perovskite nanocrystal growth is induced, and a perovskite-polymer composite film with continuously adjustable emission spectrum is obtained. Based on the quantum size effect of a single halogen system or the ion exchange mechanism of a mixed halogen system, the application realizes, for the first time, sub-nanometer precision continuous spectrum tuning in a visible light band in the composite film, and can directly write a high-resolution 2D or 3D light-emitting pattern in the film, thereby fundamentally eliminating spectrum crosstalk caused by a heterojunction, and providing a new technical platform for full-color display, information encryption and flexible optoelectronic devices.

The invention relates to the technical field of photothermal conversion coatings, in particular to a quantum dot enhanced photothermal conversion aluminized coating and a preparation method thereof, and the preparation method comprises the steps of substrate pretreatment, aluminized layer preparation, quantum dot functional layer deposition and post-treatment. CdS or CdSe quantum dots are introduced to the surface of the aluminized layer, and the quantum size effect and the local surface plasma resonance effect are utilized, so that the spectral absorption range is widened to 400-1200 nm, and the photothermal conversion efficiency is improved to 92%. The quantum dots and the aluminized layer act synergistically to activate the self-sustaining aluminizing process, so that an Al2O3 protective film is formed, and the service life of the coating is prolonged by more than 30%. The problems that a traditional aluminized coating is narrow in absorption range and low in efficiency are solved, and the efficient photo-thermal conversion requirement under the complex environment is met.

This invention discloses an AlQDs@Ga2O3 solar-blind photodetector based on quantum size effects, its fabrication method, and its applications, belonging to the field of photoelectric detection technology. The solar-blind photodetector of this invention includes a substrate, a Ga2O3 layer, a quantum dot material layer, and electrodes. The Ga2O3 layer is disposed on the surface of the substrate, and the quantum dot material layer is disposed on the surface of the Ga2O3 layer, but does not completely cover the Ga2O3 layer. The electrodes include electrode I and electrode II; electrode I and electrode II are disposed on either the Ga2O3 layer or the quantum dot material layer; and electrode I and electrode II are not simultaneously located on the same material layer; the quantum dot material layer includes aluminum quantum dots (AlQDs). This invention combines AlQDs with continuously tunable optical bandgap in the solar-blind band with Ga2O3 with a compatible bandgap value in the solar-blind band to fabricate a solar-blind detector. This detector exhibits excellent wavelength selectivity, providing new ideas for high-resolution single-pixel imaging, ultra-low-power remote sensing, and ultraviolet multispectral photoelectric detection applications, and can also be used for deep ultraviolet anti-interference imaging.

The application discloses a flexible temperature sensor based on a bionic multi-cell mixed ion pump and a preparation method thereof, and relates to the technical field of flexible electronic sensing. The application adopts thermoplastic polyurethane as a flexible substrate, introduces ionic liquid and nano zinc oxide to construct a bionic multi-cell mixed ion pump structure, and proposes a sensing mechanism of heat-induced reversible hydrogen bond rupture to release free ions. Through the formation of a hydrogen bond network between the surface hydroxyl groups of nano ZnO and the anions of ionic liquid, ions are accurately limited, and ion-electron dual signal amplification is realized in combination with the quantum size effect. The resistance temperature coefficient of the sensor in the high-temperature zone can reach 47.9% / DEG C, the temperature resolution is 0.1 DEG C, the response time is 55 ms, the recovery time is 62 ms, the sensor has excellent zero drift cycle stability and excellent mechanical anti-deformation interference capacity, the tensile strength breaks through 30 MPa, and the elongation at break is close to 400%.

This invention discloses a method for preparing surface-modified spherical hollow nanoshell NiS and its application, relating to inorganic non-metallic materials and their application in the field of passive interference technology. The prepared surface-modified spherical hollow nanoshell NiS can be used as a novel passive smoke screen interference material. Its particle surface is hydrophobically modified, making it less prone to agglomeration and exhibiting good flow properties, thus improving the compatibility of the product with equipment in practical applications. Its crystal configuration and unique hollow structure give it strong absorption and scattering capabilities. The nanometer thickness of the hollow spherical structure can excite the small size effect and quantum size effect of the material, and it has high extinction capabilities in the visible light and near-mid-far infrared bands. Compared with traditional smoke screen interference materials, it has great performance advantages, and the preparation process is simple, efficient, and low in cost.

The invention provides a super-hydrophilic self-cleaning anti-reflection photovoltaic module coating and a preparation method thereof. The super-hydrophilic self-cleaning anti-reflection photovoltaic module coating is obtained by coating photovoltaic coating sol with the pH value of 2-3 on the surface of a photovoltaic module through a pulling method or a spraying method and curing at room temperature. According to the invention, bicrystal titanium dioxide is prepared by a low-temperature sol-gel method, efficient separation of photon-generated carriers is realized through an internal electric field formed by a heterojunction interface, and active sites are increased synergistically by a quantum size effect and a crystal face; a unique strain field and a surface defect structure further expand the visible light response range, and improve the self-cleaning capability of the photovoltaic module under weak illumination intensity; a multi-element nano material composite technology and a low-temperature curing film-forming process are utilized, so that the damage of high-temperature treatment to a photovoltaic module material is avoided; functional additives such as a silane coupling agent and a hardness agent are introduced, so that the weather resistance, the wear resistance and the pollution resistance of the coating are remarkably improved. The method is simple in process, low in cost, environment-friendly and suitable for large-scale industrial production.

The invention discloses a high-strength anti-ultraviolet aluminum profile and a treatment process of the high-strength anti-ultraviolet aluminum profile, and belongs to the field of aluminum profile treatment. The formula of an electrophoretic coating for the anti-ultraviolet coating comprises a resin base material, an ultraviolet screening agent, a primer reinforcing agent, a light stabilizer, an antioxidant, a flatting agent, a defoaming agent, a conductive agent and a solvent. According to the high-strength anti-ultraviolet aluminum profile provided by the invention, the modified nano TiO2 is added into the electrophoretic coating, and the high specific surface area and the quantum size effect of the modified nano TiO2 are utilized, so that ultraviolet rays are effectively absorbed and scattered, and an aluminum substrate is protected. And gamma-methacryloyloxypropyltrimethoxysilane is used for enhancing the adhesive force of the primer. The innovative process comprises dynamic electrophoretic coating, ultraviolet-assisted curing and surface curing strengthening, the uniformity, smoothness and wear resistance of a coating are improved, and a hard and scratch-resistant surface is formed.