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A kind of ammonia gas sensor with nanocomposite material as sensing film

A nanocomposite material and ammonia gas sensor technology, applied in the field of ammonia gas sensor, can solve the problems of long response and recovery time, inability to achieve detection requirements, poor selectivity, etc., and achieve high temperature working conditions, good response reversibility, and processability. Good results

Active Publication Date: 2022-04-12
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing ammonia sensors based on graphene materials usually use reduced graphene oxide materials modified by silver nanoparticles or reduced graphene oxide materials prepared by various reduction methods, which have low sensitivity, poor selectivity, The defect of long response and recovery time cannot meet the detection requirements of trace amounts of ammonia at room temperature and in the presence of various interfering gases

Method used

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  • A kind of ammonia gas sensor with nanocomposite material as sensing film
  • A kind of ammonia gas sensor with nanocomposite material as sensing film
  • A kind of ammonia gas sensor with nanocomposite material as sensing film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The preparation of the Fe2O3 nanorod / reduced graphene oxide composite sensing film comprises the following steps:

[0032] Prepare a graphene oxide aqueous solution with a concentration of 1mg / mL, then add ferric chloride hexahydrate, sodium hydroxide and cetyltrimethylammonium bromide, ferric chloride hexahydrate, graphene oxide, sodium hydroxide and hexadecyl The weight ratio of alkyltrimethylammonium bromide is 1:0.01:0.2:0.5. Stir and ultrasonically oscillate to fully mix, transfer to a hydrothermal kettle for microwave hydrothermal reaction at 100°C for 20 minutes, and the reaction product is centrifuged to remove water Annealing at 200° C. for 1 hour in a tube furnace to prepare ferric oxide nanorods / reduced graphene oxide composites, wherein the percentage of ferric oxide nanorods is 95%, and the percentage of ferric oxide nanorods is 95%. 100nm in diameter and 350nm in length.

Embodiment 2

[0034] Construction of the ammonia sensor

[0035] An ammonia gas sensor is composed of a sensing film, a pair of electrodes, and an insulating substrate, wherein the insulating substrate is made of ceramics, rectangular in shape and 1.5mm×1.0mm in size; the pair of electrodes is an interdigitated gold electrode; the sensing film is The sensing film described in embodiment 1; the forked gold electrode is fixed on the surface of the ceramic substrate, the sensing film is covered on the ceramic substrate between the forked gold electrode and the forked gold electrode, and there are leads on the forked gold electrode for transmit electrical signals.

[0036] The ferric oxide nanorod / reduced graphene oxide composite material described in Example 1 was drop-coated on the surface of the interdigitated gold electrode with a ceramic substrate, and the thickness of the sensing film was 100 nm. A room-temperature ammonia sensor based on Fe2O3 nanorods / reduced graphene oxide composite w...

Embodiment 3

[0043]Preparation method as described in Example 1, wherein the weight ratio of ferric chloride hexahydrate, graphene oxide, sodium hydroxide and cetyltrimethylammonium bromide is 1:0.1:0.6:2, prepared The Fe2O3 nanorod / reduced graphene oxide composite material, wherein the percentage of the Fe2O3 nanorod is 50%, the diameter of the Fe2O3 nanorod is 300nm, and the length is 800nm.

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Abstract

The invention provides an ammonia gas sensor using a nanocomposite material as a sensing film, belonging to the technical field of gas sensors. The sensing film of the ammonia gas sensor is a composite material of ferric oxide nanorod / reduced graphene oxide; the ferric oxide nanorod is embedded on the surface of the reduced graphene oxide layered structure. The film made of ferric oxide nanorod / reduced graphene oxide composite material is the sensitive element, and the sensitive element is coated on the ceramic substrate with surface photolithography and evaporated interdigitated electrodes to prepare a resistive thin film ammonia sensor; The ammonia sensor based on ferric oxide nanorod / reduced graphene oxide composite material of the present invention has high sensitivity, high selectivity, strong repeatability and good stability, greatly reduces the power consumption during the use of the sensor, and improves It ensures the portability of sensor use, which has important practical and research value for this technical field.

Description

technical field [0001] The invention belongs to the technical field of gas sensors, and in particular relates to an ammonia gas sensor using a nanocomposite material as a sensing film. Background technique [0002] With the improvement of people's quality of life, the requirements for industrial production and living conditions are getting higher and higher, and people's demand for gas sensors is also increasing. The research and development of gas sensors, especially the research of toxic and harmful gas sensors, has been developing rapidly. Ammonia is a toxic gas widely used in industry. It is colorless and has a pungent odor. It has irritating and corrosive effects on the upper respiratory tract of animals or humans. life threatening. At present, the gas sensor for detecting ammonia has been widely used in municipal, fire protection, gas, telecommunications, petroleum, chemical, coal, electric power, pharmaceutical, metallurgy, coking, storage and transportation and oth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/06
Inventor 冯亮孟虎
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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