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Sensing material based on adjustable P-to-N type conversion and preparation method thereof

A sensing material, N-type technology, applied in the analysis of materials, material resistance, material analysis by electromagnetic means, etc., to achieve the effect of strong repeatability, simplified preparation process, good sensitivity and selectivity

Active Publication Date: 2016-03-16
NANJING UNIV OF INFORMATION SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems and deficiencies of the existing sensing materials, the present invention uses an in-situ synthesis method to prepare a high-performance sensor integrating sensing materials and devices, and prepares a new type of sensing material with controllable thickness and aperture through a steam hydrothermal synthesis method.

Method used

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  • Sensing material based on adjustable P-to-N type conversion and preparation method thereof
  • Sensing material based on adjustable P-to-N type conversion and preparation method thereof
  • Sensing material based on adjustable P-to-N type conversion and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] In the glove box, weigh 0.004g of platinum chloride and 0.12g of anhydrous tin chloride, dissolve them in 2.5g of anhydrous n-butanol, add 0.024g of polymer P103, then add 0.18g of concentrated sulfuric acid, stir and mix evenly A clear solution was obtained which was stirred overnight. Start the homogenizer, fix the sensing substrate device in the chamber of the homogenizer, use a pipette to pipette 100l of sol solution each time, control the humidity in the chamber to be 30%, spin-coating speed is 3500rpm, and spin-coating time is 40sec, spin coating was repeated 5 times. The device coated with the thin film material was dried at 60° C. for 2 hours to obtain a gel material. Prepare a sodium chloride supersaturated solution, put the supersaturated solution into an airtight container, ensure that the relative humidity in the airtight container is stable at about 75% at room temperature, and then put the device coated with the gel sensing material into the airtight cont...

Embodiment 2

[0030] In the glove box, weigh 0.004g of platinum chloride and 0.12g of anhydrous tin chloride, dissolve them in 3.6g of anhydrous n-butanol, add 0.036g of polymer P103, then add 0.2g of concentrated sulfuric acid, stir and mix evenly A clear solution was obtained which was stirred overnight. Start the homogenizer, fix the sensing substrate device in the chamber of the homogenizer, use a pipette to pipette 100l of sol solution each time, control the humidity in the chamber to 20%, spin-coating speed is 3500rpm, and spin-coating time is 40sec, spin coating was repeated 5 times. The device coated with the thin film material was dried at 40° C. for 8 hours to obtain a gel material. Prepare a potassium chloride supersaturated solution, put the supersaturated solution into an airtight container, ensure that the relative humidity in the airtight container is stable at about 85% at room temperature, and then put the device coated with the gel sensing material into the airtight conta...

Embodiment 3

[0032] In the glove box, weigh 0.002g of platinum chloride and 0.12g of anhydrous tin chloride, dissolve them in 4.8g of anhydrous n-butanol, add 0.06g of polymer P103, then add 0.24ml of concentrated sulfuric acid, stir and mix evenly A clear solution was obtained which was stirred overnight. Start the homogenizer, fix the sensing substrate device in the chamber of the homogenizer, use a pipette to pipette 100l of sol solution each time, control the humidity in the chamber to 50%, spin-coating speed is 4000rpm, and spin-coating time is 30sec, spin coating was repeated 5 times. The device coated with the thin film material was dried at 30° C. for 12 hours to obtain a gel material. Prepare a copper sulfate supersaturated solution, put the supersaturated solution into an airtight container, ensure that the relative humidity in the airtight container is stable at about 95% at room temperature, and then put the device coated with the gel sensing material into the airtight contain...

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Abstract

The invention discloses a sensing material based on adjustable P-to-N type conversion and a preparation method thereof. An in-situ synthesis method is employed for preparation of a sensing material-device integrated high performance sensor, and a steam hydrothermal synthesis method is employed to prepare the novel sensing material with controllable thickness and pore diameter; and controllable synthesis of the sensing material with performance conversion from P type to N type is realized by adjusting and controlling roasting temperature and the content of doping matters. The method can effectively adjust and control nanostructure ordering, nanometer grain size and the ratios of component by adjusting and controlling the roasting temperature and platinum content. According to the invention, through adjusting and controlling the roasting temperature, sensing performance of the sensing material is converted from P type to N type, sensing response time under the condition of room temperature can be controlled at about 25 seconds, and the sensing material has good sensitivity and selectivity to trace toluene.

Description

technical field [0001] The invention belongs to a novel gas sensing device, in particular to a sensing material based on adjustable P-to-N conversion and a preparation method thereof. Background technique [0002] In recent years, chemical gas sensors have become more and more important not only in scientific fields but also in people's daily life, such as food safety, biomedicine, and urban safety. At present, the research focus of gas sensors is mainly on the detection of toxic and harmful substances. Among the many toxic and harmful substances, toluene is irritating to human skin and can damage the nervous system of the human body. Therefore, immediate and accurate detection of traces of toluene is critical to public health as well as environmental sanitation. [0003] At present, the testing methods used to detect traces of toluene mainly include electrochemical methods, optical testing methods and chemical resistance testing methods. Among these three types of method...

Claims

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Application Information

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IPC IPC(8): G01N27/12C01G19/02
CPCC01G19/02C01P2002/72C01P2004/04G01N27/127
Inventor 邵绍峰江凡傅瑞雪王世敏雷雅婷
Owner NANJING UNIV OF INFORMATION SCI & TECH
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