33results about How to "Good gas response" patented technology

The invention belongs to the technical field of gas sensors, and relates to a gas sensor based on a metal molybdate nanocomposite and a preparation method thereof. An annular gold electrode of the sensor is coated with a metal molybdate nanocomposite film; the specific preparation process of the metal molybdate nano composite material comprises the following steps: firstly, preparing MoS2 powder from ammonium molybdate, thiourea, ammonium fluoride and the like according to a hydrothermal synthesis method, and meanwhile, preparing a semiconductor metal oxide suspension from semiconductor metalsalt through the hydrothermal synthesis method; carrying out hydrothermal synthesis on the molybdenum sulfide powder and the semiconductor metal oxide suspension liquid to obtain a molybdenum sulfidenano composite material precursor, and calcining the prepared molybdenum sulfide nano composite material precursor in an atmosphere to obtain a metal molybdate nano composite material. The ethanol gassensor has the advantages of high selectivity, high sensitivity, good stability, long service life, short response time and recovery time to ethanol gas, excellent performance, and rapid and timely ethanol gas alarm.

The invention discloses a tungsten trioxide gas-sensitive film material, a tungsten trioxide-based composite gas-sensitive film material, and preparation methods and applications of the tungsten trioxide gas-sensitive film material and the tungsten trioxide-based composite gas-sensitive film material, wherein a tungsten trioxide thin gas-sensitive material with a nanometer structure is directly prepared on an electrode substrate through in-situ solution deposition, and second phase oxide compounding is performed at the prepared tungsten trioxide thin film through a sol-gel method to obtain a tungsten trioxide-based composite gas-sensitive film material. According to the present invention, the tungsten trioxide film with the nanometer structure can be subjected to direct deposition growth on the electrode substrate; the prepared nanometer structure tungsten trioxide thin film and the composite thin film based on the nanometer structure tungsten trioxide have the network-like structure formed by the nano-sheets growing perpendicular to the substrate; the method has advantages of high efficiency, low cost and simple process, and is suitable for industrial production; and the obtainednanometer structure tungsten trioxide film has a large specific surface area, can effectively overcome the agglomeration problem among nanoparticles, has good gas-sensitive response to gases such as NO2, H2S and the like, and has excellent gas-sensitive application prospect.

The invention belongs to the field of comprehensive recycling of industrial waste tin, environmental protection and semiconductor oxide formaldehyde gas sensors, and relates to a preparation method offormaldehyde gas sensitive materials based on tin mud modification in a tin plating process and an application. The formaldehyde gas-sensitive materials are prepared from waste tin mud existing at the bottom of a plating bath on a tin plating production line by acidification activation, washing, drying, noble metal doping and subsequent heat treatment. The prepared gas sensor has excellent gas-sensitive performance such as high sensitivity, fast response, high recovery speed and the like for formaldehyde. Effective and reasonable utilization of tin resources is realized, the economic cost isreduced, environmental pollution caused by waste is reduced, and the preparation method is environmentally friendly.

The invention discloses a wireless passive H2 gas sensor based on WO3 and a preparation method thereof. The gas sensor comprises a ceramic substrate, and an inductance coil and a composite gas sensitive resistor, which are printed on the ceramic substrate, wherein an outer end of the inductance coil is connected with one end of the composite gas sensitive resistor through silver paste filled in athrough hole in the ceramic substrate, and an inner end of the inductance coil is connected with the other end of the composite gas sensitive resistor to form an LR sensitive circuit; the ceramic substrate is made of an aluminium oxide raw ceramic tape and is prepared by an HTC process, the inductance coil is prepared by silk-screen printing process with Ag as paste, and the composite gas sensitive resistor is prepared from a Pt-WO3 composite material by a magnetron sputtering process. The gas sensor disclosed by the invention uses a wireless non-contact measurement method, can accurately realize the detection of a gas H2 to be measured under low temperature conditions by analyzing the threshold that changes with resistance, adopts the mature silk-screen printing process and the magnetronsputtering preparation process, and has the advantages of simple and convenient processing, low cost, etc.

The invention discloses a zinc oxide gas-sensitive film material, a preparation method therefor and an application of the zinc oxide gas-sensitive film material. A nanostructure zinc oxide film is directly prepared on an electrode substrate by using solution low-temperature in-situ deposition. The prepared nanostructure zinc oxide film has a network-shaped structure formed by nanosheets growing vertical to the substrate. The zinc oxide gas-sensitive film material has the advantages of high efficiency, low cost and simple process and is suitable for being industrially produced. The obtained nanostructure zinc oxide film has a relatively large specific surface area, the problem of agglomeration among nanoparticles can be effectively overcome, and the zinc oxide gas-sensitive film material has good gas-sensitive response to gases such as NO2 and H2S and has an excellent gas-sensitive application prospect.