Three-dimensional In2O3/SnO2 core-shell nanocomposite for detecting formaldehyde gas and gas sensor prepared therefrom

A nanocomposite material and gas sensor technology, applied in the field of semiconductor nanomaterials, can solve the problems of insufficient sensitivity of formaldehyde gas, insufficient detection limit, high working temperature, etc., to achieve improved sensitivity and selectivity, low cost and good stability Effect
CN109835944AActive Publication Date: 2019-06-04UNIV OF SHANGHAI FOR SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
UNIV OF SHANGHAI FOR SCI & TECH
Publication Date
2019-06-04

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Abstract

The invention discloses a three-dimensional In2O3 / SnO2 core-shell nanocomposite for detecting formaldehyde gas and a gas sensor prepared therefrom, a three-dimensionally-classed core-shell heterojunction structure is obtained by taking In2O3 nanofiber as a skeleton and uniformly growing a uniform SnO2 nanosheet array on the fiber surface by a hydrothermal method; the obtained three-dimensional In2O3 / SnO2 core-shell nanocomposite is mixed with ethanol and stirred into a paste, and is uniformly applied to the surface of an alumina ceramic tube with gold electrodes at both ends, welding, aging and encapsulation are performed according to a heater-type semiconductor gas sensor, a formaldehyde gas sensor is prepared, the formaldehyde gas sensor has high sensitivity to the formaldehyde gas, goodselectivity to an interference gas, good stability, and low working temperature, and can be used for indoor detection of the formaldehyde gas in the living environment, and the concentration of the detected formaldehyde gas is 0.1 to 500 ppm.
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Description

technical field

[0001] The invention belongs to the technical field of semiconductor nanomaterials, relates to a novel formaldehyde gas detection material and a gas sensor, in particular to a three-dimensional In 2 o 3 / SnO 2 Core-shell nanocomposite material and gas sensor made from it. Background technique

[0002] In recent years, real-time and effective detection of various toxic chemical gases has become a research hotspot due to their potential harm to human body and environment. Formaldehyde is a colorless and toxic gas that widely exists in living environments such as homes, offices, and cars. It is very harmful to human health. Inhaling a small amount of formaldehyde gas (2ppm) in a short period of time can cause serious health problems, such as nausea ( 0.2-1.9ppm), tearing (4-20ppm), pulmonary edema, sneezing, coughing, and nausea. Long-term exposure to high concentrations of formaldehyde gas will lead to various degrees of damage to various organs in the body...

Claims

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