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Gas sensor based on metal molybdate nano composite material and preparation method thereof

A nanocomposite material, gas sensor technology, applied in nanotechnology for sensing, nanotechnology for materials and surface science, nanotechnology, etc., can solve problems such as poor timeliness and low sensitivity

Active Publication Date: 2019-05-21
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 shortcoming that prior art exists, there is the shortcoming that timeliness is poorer, sensitivity is lower etc. for existing laboratory monitoring method

Method used

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  • Gas sensor based on metal molybdate nano composite material and preparation method thereof
  • Gas sensor based on metal molybdate nano composite material and preparation method thereof
  • Gas sensor based on metal molybdate nano composite material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0054] The gas sensor based on the metal molybdate nanocomposite that the present embodiment relates to has 2 discrete ring-shaped gold electrodes on the outer surface of the Al 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 on 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 formed, 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 suspension: prepari...

Embodiment 2

[0061] The nano-flower-like In based on this embodiment involves 2 (MoO 4 ) 3 @In 2 o 3 The ethanol gas sensor of the nanocomposite material, it is made of Al with 2 discrete annular 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 film 3 on the ring-shaped gold electrode are composed of a nano-flower-like 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 nanocomposites 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 sp...

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, 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 between the detected gas and 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 (Mo...

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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 and a preparation method thereof. An annular gold electrode of the sensor is coated with a metal molybdate nanocomposite film; the specific preparation process of the metal molybdate nano composite material comprises the following steps: firstly, preparing MoS2 powder from ammonium molybdate, thiourea, ammonium fluoride and the like according to a hydrothermal synthesis method, and meanwhile, preparing a semiconductor metal oxide suspension from semiconductor metalsalt through the hydrothermal synthesis method; carrying out hydrothermal synthesis on the molybdenum sulfide powder and the semiconductor metal oxide suspension liquid to obtain a molybdenum sulfidenano composite material precursor, and calcining the prepared molybdenum sulfide nano composite material precursor in an atmosphere to obtain a metal molybdate nano composite material. The ethanol gassensor has the advantages of high selectivity, high sensitivity, good stability, long service life, short response time and recovery time to ethanol gas, excellent performance, and rapid and timely ethanol gas alarm.

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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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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