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Room temperature ammonia gas sensor using p-type delafossite structure oxide as sensitive material, and preparation method thereof

An ammonia gas sensor and sensitive material technology, applied in the field of sensitive materials and sensors, can solve the problems of poor selectivity, long response-recovery time, etc., and achieve the effects of convenient operation, short response and recovery time, and avoiding the aging or damage of the overall device

Active Publication Date: 2018-10-19
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current ammonia sensor has disadvantages such as poor selectivity, long response-recovery time, and the need to work at high temperatures (>150°C).

Method used

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  • Room temperature ammonia gas sensor using p-type delafossite structure oxide as sensitive material, and preparation method thereof
  • Room temperature ammonia gas sensor using p-type delafossite structure oxide as sensitive material, and preparation method thereof
  • Room temperature ammonia gas sensor using p-type delafossite structure oxide as sensitive material, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] A room temperature ammonia sensor using p-type delafossite structure oxide as a sensitive material, including a gas-sensing material and a substrate, the gas-sensing material is evenly coated on the surface of the substrate, the coating thickness of the gas-sensing material is 10 μm, and the gas-sensing material is p-type delafossite structure AgAlO 2 Nanoparticles, particle diameter is 200nm-500nm;

[0032] Its preparation method comprises the following steps:

[0033] Step 1: Preparation of p-type delafossite structure AgAlO 2 Nanoparticles: 0.015mol Al(NO 3 ) 3 9H 2 O and 0.015molAgNO 3 Dissolve in 70 ml deionized water, add 2.4 g NaOH after dissolving, pour the above solution into 100 ml polytetrafluoroethylene lining, put the autoclave in an oven at 210 ° C for 64 hours, cool to room temperature and take it out, silver white The powder is washed with 1M / L dilute ammonia water, 1M / L dilute nitric acid, deionized water, and dried for use;

[0034] Step 2, prep...

Embodiment 2

[0038] A room temperature ammonia sensor using p-type delafossite structure oxide as the sensitive material, including a gas-sensing material and a substrate, the gas-sensing material is evenly coated on the surface of the substrate, the coating thickness of the gas-sensing material is 50 μm, and the gas-sensing material is p-type delafossite structure AgAlO 2 Nanoparticles, the particle diameter is 1μm-3μm;

[0039] Its preparation method comprises the following steps:

[0040] Step 1: Preparation of p-type delafossite structure AgAlO 2 Nanoparticles: 0.015mol Al(NO 3 ) 3 9H 2 O and 0.01575mol AgNO 3 Dissolve in 70 ml deionized water, add 3 g NaOH after dissolving, pour the above solution into 100 ml polytetrafluoroethylene lining, put the autoclave in an oven at 220 ° C for 64 hours, cool to room temperature and take it out, silver white The powder is washed with 1M / L dilute ammonia water, 1M / L dilute nitric acid, deionized water, and dried for use;

[0041] Step 2, p...

Embodiment 3

[0044] A room temperature ammonia sensor using p-type delafossite structure oxide as a sensitive material, including a gas-sensing material and a substrate, the gas-sensing material is evenly coated on the surface of the substrate, the coating thickness of the gas-sensing material is 100 μm, and the gas-sensing material is p-type delafossite structure AgAlO 2 Nanoparticles, the particle diameter range is 200nm-500nm;

[0045] Its preparation method comprises the following steps:

[0046] Step 1: Preparation of p-type delafossite structure AgAlO 2 Nanoparticles: 0.015mol Al(NO 3 ) 3 9H 2 O and 0.015molAgNO 3 Dissolve in 70 ml deionized water, add 2.4 g NaOH after dissolving, pour the above solution into 100 ml polytetrafluoroethylene lining, put the autoclave in an oven at 220 ° C for 64 hours, cool to room temperature and take it out, silver white The powder is washed with 1M / L dilute ammonia water, 1M / L dilute nitric acid, deionized water, and dried for use;

[0047] S...

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Abstract

The invention discloses a room temperature ammonia gas sensor using a p-type delafossite structure oxide as a sensitive material, and a preparation method thereof. According to the present invention,the resistive room temperature ammonia gas sensor with excellent performance is constructed by using the p-type delafossite structure AgAlO2 as the sensitive material of the ammonia gas sensor; by completely utilizing the advantages of high sensitivity, low cost, simple device, easy integration and easy on-site continuous detection of the semiconductor resistor type sensing material and the characteristic of high selectivity of AgAlO2 to ammonia gas at a room temperature, the resistive sensor with characteristics of working at a room temperature, sensitive response to ammonia gas (the detection lower limit can reach 1000000-level), good selectivity, good stability, economy and environmental protection can be constructed, the good sensitive material is provided for ammonia sensors, and thenew application field is provided for P-type wide band gap delafossite structure oxides.

Description

technical field [0001] The invention belongs to the technical field of sensitive materials and sensors, and in particular relates to a room temperature ammonia sensor using a p-type delafossite structure oxide as a sensitive material and a preparation method thereof. Background technique [0002] Ammonia is widely used in chemical industry, light industry, chemical fertilizer, pharmaceutical, synthetic fiber and other fields. It is often used to manufacture ammonia water, nitrogen fertilizer (urea, ammonium bicarbonate, etc.), and some nitrogen-containing inorganic salts and organic intermediates Both need to directly use ammonia as raw material. Ammonia exists in the form of gas at normal temperature and pressure, called ammonia gas. Ammonia is a colorless gas with a strong pungent smell, which can irritate and burn human skin, eyes and mucous membranes of respiratory organs. If inhaled too much, it can cause lung swelling and even death. Metal-semiconductor materials are...

Claims

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Application Information

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IPC IPC(8): G01N27/12
CPCG01N27/127
Inventor 邓赞红方晓东孟钢董伟伟邵景珍王时茂
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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