Ethanol gas sensor based on In2O3 microflower/SnO2 nanoparticle composite material and preparation method of sensor
A gas sensor and nanoparticle technology, applied in the direction of material resistance, can solve the problems of national and personal life and property safety loss, ethanol evaporation or leakage, and decline in control ability, achieving rapid adsorption and desorption, increased sensitivity, and recovery speed up effect
Inactive Publication Date: 2015-04-29
JILIN UNIV
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Problems solved by technology
Ethanol is an important chemical raw material and solvent, volatile and flammable. In the process of production and use, if a large amount of ethanol evaporates or leaks due to improper operation, it will cause combustion or explosion accidents, causing serious damage to the life and property safety of the country and individuals. loss
Most people have the habit of drinking alcohol, but if they drink too much, it will reduce people's ability to control, ranging from losing their composure to causing physical injury and even death
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Embodiment 1
[0047] to In 2 o 3 Micron flowers and SnO 2 Nanoparticle mass ratio of 2:1 composite In 2 o 3 Micron flower / SnO 2 The nanoparticle composite material is used as a gas sensitive material to make the S1 type acetone sensor. The manufacturing process is as follows:
[0048] (1) Weigh 0.526g SnCl 4 ·5H 2 O, 0.6g CTAB (cetyltrimethylammonium bromide) and 0.2g HMT (hexamethylenetetramine), dissolved in 40mL solvent (deionized water and absolute ethanol each 20mL), stirred at room temperature Until it becomes clear, transfer the resulting solution into a hydrothermal kettle, react at 200°C for 4 hours, and take out the precipitate after cooling for a period of time to obtain SnO 2 Nanoparticle precursors.
[0049] (2) Weigh 0.381g In(NO 3 ) 3 4.5H 2 O, 0.15g urea, dissolved in 36mL deionized water, stirred at room temperature until clarified, moved the obtained solution into a hydrothermal kettle, reacted at 160°C for 4h, took out the precipitate after cooling for a period...
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Abstract
The invention discloses an ethanol gas sensor based on an In2O3 microflower/SnO2 nanoparticle composite material and a preparation method of the sensor, belonging to the technical field of gas sensors. The ethanol gas sensor consists of a nickel-cadmium alloy heating coil, an alumina ceramic tube, a platinum wire, a gold electrode and an In2O3 microflower/SnO2 nanoparticle composite material. By utilizing the catalytic activity of SnO2 on In2O3, the oxidative activity of the material is improved, so that the sensitivity of the sensor is greatly improved, materials with morphology are directly mixed at the first time, the large specific surface area of the material is utilized, and the catalytic characteristics between oxides are utilized. According to the material, ethanol gas molecules are transported on the surface and have the characteristics of rapid adsorption and desorption, so that the response and recovery speed of the sensor is increased. Compared with an ethanol sensor manufactured by In2O3 microflowers which are not compounded with SnO2 nanoparticles, the ethanol sensor disclosed by the invention has the advantages that the sensitivity is greatly improved, and the sensitivity of the ethanol sensor disclosed by the invention is about 9.5 times that of the sensitivity of the ethanol sensor manufactured by In2O3 microflowers.
Description
technical field [0001] The invention belongs to the technical field of gas sensors, in particular to a sensor based on In 2 o 3 Micron flower / SnO 2 Nanoparticle composite material ethanol gas sensor and preparation method thereof. Background technique [0002] Organic vapor refers to gases containing aromatic hydrocarbons, nitro hydrocarbons, halogenated hydrocarbons, long-chain alkanes, alcohols, ethers, ketones, fats, hydrazine and other organic compounds, which are basically toxic, flammable and explosive gases. For gases that endanger human survival and health, once they exceed the allowable concentration, they will have adverse effects on the human body. Ethanol is an important chemical raw material and solvent, volatile and flammable. In the process of production and use, if a large amount of ethanol evaporates or leaks due to improper operation, it will cause combustion or explosion accidents, causing serious damage to the life and property safety of the country an...
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IPC IPC(8): G01N27/12
Inventor 卢革宇刘旸刘凤敏孙鹏梁喜双
Owner JILIN UNIV
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