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A gas sensor based on metal molybdate nanocomposite material and its preparation method

A nanocomposite material, gas sensor technology, applied in nanotechnology for sensing, nanotechnology for materials and surface science, material resistance, etc., can solve problems such as poor timeliness and low sensitivity, and achieve response time and The effect of short recovery time, improved sensitivity, and simple synthesis method

Active Publication Date: 2021-06-04
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to overcome the shortcomings of the prior art, for existing laboratory monitoring methods have the shortcomings of poor timeliness and low sensitivity, etc.

Method used

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  • A gas sensor based on metal molybdate nanocomposite material and its preparation method
  • A gas sensor based on metal molybdate nanocomposite material and its preparation method
  • A gas sensor based on metal molybdate nanocomposite material and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] The gas sensor based on the metal molybdate nanocomposite material that the present embodiment relates to, it has the Al with 2 discrete annular gold electrodes on the outer surface 2 o 3 Insulated ceramic tube 1, passing through Al 2 o 3 The nickel-cadmium alloy coil 2 inside the insulating ceramic tube and coated in Al 2 o 3 The outer surface of the insulating ceramic tube and the sensitive material thin film 3 on the annular gold electrode are composed, and the sensitive material is a metal molybdate nanocomposite material;

[0055] The concrete preparation technology of described metal molybdate nanocomposite material is:

[0056] Step 1: Prepare molybdenum sulfide powder: prepare MoS by hydrothermal synthesis of ammonium molybdate, thiourea, ammonium fluoride and citric acid 2 suspension, and then the MoS 2 Preparation of MoS by suspension washing, sonication, centrifugation and drying 2 powder;

[0057] Step 2: preparing a semiconducting metal oxide suspen...

Embodiment 2

[0061] The nano-flower-like In based on this embodiment involves 2 (MoO 4 ) 3 @In 2 o 3 Nanocomposite ethanol gas sensor consisting of Al with 2 discrete ring-shaped gold electrodes on the outer surface 2 o 3 Insulating ceramic tube 1, passing through Al 2 o 3 The nickel-cadmium alloy coil 2 inside the insulating ceramic tube and coated in Al 2 o 3 The outer surface of the insulating ceramic tube and the sensitive material thin film 3 on the annular gold electrode, the sensitive material is nano-flower In 2 (MoO 4 ) 3 @In 2 o 3 nanocomposites;

[0062] The nanoflower-like In 2 (MoO 4 ) 3 @In 2 o 3 The specific preparation process of nanocomposite materials is as follows:

[0063] Step 1: Prepare molybdenum sulfide powder: prepare MoS by hydrothermal synthesis of ammonium molybdate, thiourea, ammonium fluoride and citric acid 2 suspension, and then the MoS 2 Preparation of MoS by suspension washing, sonication, centrifugation and drying 2 Powder, the speci...

Embodiment 3

[0082] In this example, the In prepared in Example 2 2 (MoO 4 ) 3 @5In 2 o 3 、In 2 (MoO 4 ) 3 @2.5In 2 o 3 、In 2 (MoO 4 ) 3 @1.25In 2 o 3 and In 2 o 3 Mix with 3-8 drops of deionized water respectively to form a paste, and then spread the paste evenly on the gas sensor alumina ceramic tube 1, and dry it at 60°C for 12 hours to obtain In 2 (MoO 4 ) 3 @5In 2 o 3 、In 2 (MoO 4 ) 3 @2.5In 2 o 3 、In 2 (MoO 4 ) 3 @1.25In 2 o 3 and In 2 o 3 Four gas sensors.

[0083] Such as image 3 Shown, In 2 (MoO 4 ) 3 @5In 2 o 3 、In 2 (MoO 4 ) 3 @2.5In 2 o 3 、In 2 (MoO 4 ) 3 @1.25In 2 o 3 and In 2 o 3 The gas sensing performance of the four gas sensors is closely related to the operating temperature, which is caused by the gas reaction kinetics, such as chemisorbed oxygen and the interaction of the detected gas with the n-type semiconductor In 2 o 3 The electron gain and loss relationship between, when the temperature is 300 °C, based on In 2 (M...

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Abstract

The invention belongs to the technical field of gas sensors, and relates to a gas sensor based on a metal molybdate nanocomposite material and a preparation method thereof; the ring-shaped gold electrode of the sensor is coated with a metal molybdate nanocomposite film, and the metal The specific preparation process of molybdate nanocomposites is as follows: first, ammonium molybdate, thiourea and ammonium fluoride are prepared by hydrothermal synthesis of MoS 2 At the same time, the semiconducting metal oxide suspension is prepared by hydrothermal synthesis of the semiconducting metal salt; then the molybdenum sulfide powder and the semiconducting metal oxide suspension are hydrothermally synthesized into the molybdenum sulfide nanocomposite precursor, and the prepared molybdenum sulfide The metal molybdate nanocomposite material is obtained by calcining the precursor of the nanocomposite material in an atmosphere; the ethanol gas sensor has high selectivity to ethanol, high sensitivity, good stability, long service life, and short response time and recovery time to ethanol gas , excellent performance, quick and timely alarm for ethanol gas.

Description

Technical field: [0001] The invention belongs to the technical field of gas sensors, and relates to a gas sensor element with high gas response and selectivity and a preparation method thereof, in particular to a gas sensor based on a metal molybdate nanocomposite material and a preparation method thereof. Background technique: [0002] Metal molybdates are an important family of inorganic salt materials, and have attracted widespread attention because of their unique structures and physical and chemical properties. Metal molybdates have the advantages of high stability, excellent optical and electrochemical properties, which make them widely used in various fields. For example, molybdate can be used as phosphors, scintillators, etc. in the optical field; it can be used for mildew suppression, antibacterial and seawater corrosion inhibition in the environmental field; in the field of energy storage, it can be used in the production of lithium-ion batteries and super capacito...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/22G01N27/12B82Y30/00B82Y15/00
Inventor 谢万峰王昱冲张峰华袁子童关延峰孟玉杨沛霖
Owner QINGDAO UNIV
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