34results about How to "Increased humidity sensitivity" patented technology

A rapid response relative humidity sensor based on nano-structured aluminum oxide thin film is disclosed. The main body of the sensor is an anodic aluminum oxide thin film of about 2-20 μm thick formed from an Al substrate which serves as one electrode. A porous metal layer of about 20-200 nm thick is formed over the anodic aluminum oxide thin film and functions as a second electrode. The alumina thin film contains nano-sized channels of about 10-100 nm in diameter, serving as a capacitive relative humidity sensor having high sensitivity and short response time. Thermal annealing at elevated temperature improves the linearity of the capacitance versus humidity curve, giving a full range humidity sensing range. Hysteresis and degradation are negligible for the humidity sensors.

The invention discloses a self-powered humidity sensor based on a composite spinning film and a preparation method thereof, and relates to energy collection technology and sensitive electronics technology. Based on Nb 2 CT x The self-powered humidity sensor of the sodium alginate composite spinning film comprises a sensitive device and a spinning sensitive film arranged on the sensitive device, the sensitive device is an upper and lower electrode structure, and the sensitive film is made of Nb 2 CT x / Sodium alginate composites were prepared by electrospinning process. Utilize Nb 2 CT x The nanosheet and the nanocomposite fiber structure obtained by spinning provide a three-dimensional network space for the diffusion of water molecules; after the water molecules are adsorbed from top to bottom, the ion gradient diffuses to form a potential difference between the upper and lower electrodes and output a voltage signal. Compared with the traditional humidity sensor, the self-powered humidity sensor of the present invention does not require an external power supply system, and has the advantages of low power consumption, environmental protection, convenient portability, flexibility and lamination.

The invention relates to a preparation method of a low-cost high-sensitivity NaCl doped mesoporous silica resistor type humidity-sensitive material. The preparation method comprises the following steps of synthesizing a mesoporous silicon dioxide molecular sieve by adopting a hydrothermal method, forging the obtained mesoporous material at 550 DEG C so as to remove a surfactant, mixing the forged mesoporous material with a proper amount of sodium chloride, grinding again by taking absolute ethyl alcohol as a solvent, and doping. The preparation method has the characteristics of simple doping process, no need of thermal treatment and simplified preparation technology. According to the low-cost high-sensitivity NaCl doped mesoporous silica resistor type humidity-sensitive material, the humidity-sensitive sensitivity is high; within the full-humidity range ability of 11%RH-95%RH, the impedance change order of magnitude is greater than four orders of magnitude and approaches five orders of magnitude, and the ideal doping proportion is obtained by testing for multiple times; the humidity-sensitive performance of the material is improved effectively; within the full-humidity range ability of 11%RH-95%RH, the impedance change order of magnitude is greater than four orders of magnitude and approaches five orders of magnitude, and meanwhile, the preparation technology of the type of materials is simplified.

The invention relates to a preparation method of a macromolecular hydrogen bond compound fiber. The method comprises the following steps: respectively dissolving and mixing a macromolecular hydrogen bond donor and a macromolecular hydrogen bond acceptor, so as to obtain a uniform spinning solution; defoaming, filtering, standing and deforming the spinning solution, metering, entering a coagulating bath to coagulate and mold through a spinneret plate, so as to obtain a nascent fiber; and drying the nascent fiber, so as to obtain the macromolecular hydrogen bond compound fiber. Two high polymers which are difficult in fiber forming are successfully spun into a compound fiber on the basis of mutual action of hydrogen bonds, so that the spinning field and the application space of the high polymers are expanded; the high polymers also have novel properties, such as high elasticity and humidity sensitivity.

The invention relates to an ionic-type polyhedral oligomeric silsesquioxane (POSS) block copolymer based humidity sensor and a preparation method thereof. The humidity sensitivity performance of the ionic-type POSS block copolymer based humidity sensor is improved through solvent annealing and porous CuO doping methods. An ionic-type POSS block copolymer selects a POSS grafted methyl methacrylatetype-sulfonated styrene block copolymer prepared by the research group, two types of topological structures, namely the star type and the tadpole type, of the polymer and the different block ratios (1:1)-(1:3) are researched, the humidity sensor with the excellent humidity sensitivity performance is prepared, through solvent annealing, hydrophilic and hydrophobic phases of the humidity sensor arepromoted to be separated, the durability and mechanical properties of a humidity sensitive material can be improved significantly, and the sensitivity of the ionic-type POSS block copolymer based humidity sensor is advantageously improved through doping of porous CuO.

The invention relates to a core shell structure n - titanium dioxide @ p - cobalt titanate nanocrystalline thin film and a preparing method thereof. A clean substrate is installed on a sample stage of a magnetron sputtering device firstly, and a CoTiO3 target and a TiO2 target are installed at two radio frequency target positions of the magnetron sputtering device correspondingly; a sputtering film coating chamber of the magnet control sputtering device is vacuumized and injected with inactive gas, and gas pressure of the sputtering film coating chamber is kept at 0.1Pa - 2Pa; the CoTiO3 target is pre-sputtered for 5min - 15min; the substrate is heated up to 300 DEG C - 600 DEG C and is subjected to heat preservation, sputtering of the CoTiO3 target is started for 30min - 90min, and a CoTiO3 orderly nanocrystalline thin film is obtained; and the CoTiO3 orderly nanocrystalline thin film is adjusted to be parallel with the TiO2 target, the TiO2 target is sputtered for 10s - 120s, and the core shell structure n - titanium dioxide @ p - cobalt titanate nanocrystalline thin film is obtained. According to the core shell structure n - titanium dioxide @ p - cobalt titanate nanocrystalline thin film and the preparing method thereof, appearance of the thin film can be adjusted effectively, the film-forming property is good, operation is convenient, the producing period is short, efficiency is high, and the core shell structure n - titanium dioxide @ p - cobalt titanate nanocrystalline thin film and the preparing method thereof are suitable for industrial production.

The invention relates to a moisture sensitive sensing film and discloses a preparation method of the moisture sensitive sensing film. The preparation method comprises using valeryl chloride as a modifying agent in an ionic liquid solution of 1-ethyl-3-methylimidazole acetate to modify the cellulose to prepare water-soluble cellulose acetate WSCA; The water-soluble cellulose acetate is configured into a cellulose aqueous solution, and the graphene oxide is configured into a solution and added to the configured cellulose solution to obtain a cellulose / graphene oxide uniform mixed solution; to the above-mentioned cellulose / graphene oxide mixed A reducing agent was added to the solution, and the obtained reduced graphene oxide / cellulose aqueous solution was treated to obtain a flexible rGO / WSCA moisture-sensitive sensing film. The moisture-sensitive film has the advantages of not easy to fall off, no hysteresis phenomenon, good humidity sensitivity, and environmentally friendly materials.

The invention discloses a preparation method for Fe3O4 / Si nano porous array composite material, which comprises: forming a silicon-metal bond passivation layer of even, high-density, well thermal stability on single-crystal silicon by hydrothermal method; preparing nano Fe3O4 particle with un-agglomerated even particle size by microporous-hydrothermal method, then preparing the product by rotation spraying method. This invention improves magnetism and wet sensitive of Fe3O4, and heeds simple devices and low cost.