Ammonia gas sensor and preparation technology thereof

An ammonia gas sensor and a preparation process technology, applied in directions such as material resistance, can solve problems such as unstable response, and achieve the effects of fewer preparation steps, high conductivity and simple process

Active Publication Date: 2015-12-23
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For ammonia sensors, Lu et al. from the University of Wisconsin in the United States made sensors from partially reduced graphene annealed in an Ar environment, which can detect NO 2 and NH 3 Response, while for NH 3 The response is unstable

Method used

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  • Ammonia gas sensor and preparation technology thereof
  • Ammonia gas sensor and preparation technology thereof
  • Ammonia gas sensor and preparation technology thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] The ammonia gas sensor includes a gas-sensing material and a substrate, the gas-sensing material is evenly coated on the surface of the substrate, the composition of the gas-sensing material includes graphene-modified titanium dioxide composite nanoparticles with a bridging structure, and the coating thickness of the gas-sensing material is 0.4- 0.5 μm. Graphene-modified titanium dioxide composite nanoparticles with a bridging structure, including graphene and titanium dioxide, the bridging structure means that graphene is bridged between the titanium dioxide, and the graphene accounts for 4.7% of the mass fraction of the composite nanoparticles, The preparation method comprises the following steps:

[0037] Step 1, prepare titanium dioxide microsphere particles: dissolve 5.3g of hexadecylamine (hexadecylamine) in 800ml of absolute ethanol (ethanol), then add 3.2ml of KCl (0.1mol / L) solution, in a water bath stirrer at room temperature Stir, add 17.6ml of isopropyl tit...

Embodiment 2

[0047] The ammonia gas sensor comprises a gas-sensitive material and a substrate, the gas-sensitive material is evenly coated on the surface of the substrate, the gas-sensitive material composition includes graphene-modified titanium dioxide composite nanoparticles with a bridging structure, the gas-sensitive material The coating thickness is 0.4-0.5 μm. Graphene-modified titanium dioxide composite nanoparticles with a bridging structure, including graphene and titanium dioxide, the bridging structure means that graphene is bridged between the titanium dioxide, and the graphene accounts for 1.9% of the mass fraction of the composite nanoparticles, The preparation method comprises the following steps:

[0048] Step 1, prepare titanium dioxide microsphere particles: dissolve 5.3g of hexadecylamine (hexadecylamine) in 800ml of absolute ethanol (ethanol), then add 3.2ml of KCl (0.1mol / L) solution, in a water bath stirrer at room temperature Stir, add 17.6ml of isopropyl titanate ...

Embodiment 3

[0055] A novel ammonia gas sensor, comprising a gas-sensing material and a substrate, the gas-sensing material is evenly coated on the surface of the substrate, the gas-sensing material composition includes graphene-modified titanium dioxide composite nanoparticles with a bridging structure, the The coating thickness of the gas-sensitive material is 0.4-0.5 μm. Graphene-modified titanium dioxide composite nanoparticles with a bridging structure, including graphene and titanium dioxide, the bridging structure means that graphene is bridged between the titanium dioxide, and the graphene accounts for 9.0% of the mass fraction of the composite nanoparticles, The preparation method comprises the following steps:

[0056] Step 1, prepare titanium dioxide microsphere particles: dissolve 5.3g of hexadecylamine (hexadecylamine) in 800ml of absolute ethanol (ethanol), then add 3.2ml of KCl (0.1mol / L) solution, in a water bath stirrer at room temperature Stir, add 17.6ml of isopropyl ti...

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Abstract

The invention discloses an ammonia gas sensor, which comprises a gas sensitive material and a substrate. The gas sensitive material is painted on the substrate surface and comprises graphene modified titanium dioxide composite nano particles with a bridge connection structure. The composite nano particle comprises graphene and titanium dioxide, and the graphene is arranged between titanium dioxide as a bridge. Graphene accounts for 0.2 to 20 wt% of the composite nano material. The thickness of the gas sensitive material coating is 0.4 to 0.5 [mu]m. The substrate is made of Si or Al2O3 and is provided with an Au electrode. The gas sensitive material of the ammonia gas sensor is composed of graphene modified titanium dioxide composite nano particles with a bridge connection structure, can respond to NH3 gas more selectively, restoratively, and stably, and has a lower work temperature.

Description

technical field [0001] The invention belongs to the technical field of nanometer materials, and in particular relates to an ammonia gas sensor and a preparation process thereof. Background technique [0002] Gas sensors in the prior art are mainly used for the detection of carbon monoxide gas, methane gas, coal gas, freon (R11, R12), ethanol in exhaled breath, bad breath in human oral cavity, etc. It converts the gas type and its concentration-related information into electrical signals, and according to the strength of these electrical signals, information related to the existence of the gas to be measured in the environment can be obtained, so that detection, monitoring, and alarm can be carried out; It can form an automatic detection, control and alarm system through the interface circuit and computer. Among them, although ammonia exists in the atmosphere at a lower concentration, the lower concentration of ammonia still has adverse effects on people's health and environ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N27/04
Inventor 李晓干赵阳阳王雪燕王兢唐祯安
Owner DALIAN UNIV OF TECH
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