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Study of Gas Sensitivity of Doped Polyaniline and Its Composite Materials

Author: ZhangLianMing
Tutor: JiangDengGao
School: Zhengzhou University
Course: Chemical processes
Keywords: Polyaniline Composites Gas Sensing Properties Sensing mechanism
CLC: TQ317
Type: Master's thesis
Year: 2007
Downloads: 248
Quote: 3
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Abstract


The gas sensor is an important chemical sensors, and has a wide range of applications in the aerospace, petrochemical, environmental and food testing. The gas-sensitive gas sensor material is the core of the traditional gas-sensitive materials such as SnO 2 , ZnO, Fe 2 O 3 and other selectivity, the operating temperature is high, the stability is not satisfactory, and thus limits the development and application of the gas sensor. Compared to the inorganic semiconductor material, a polymer-gas-sensitive materials such as polypyrrole, polythiophene, polyaniline has a cheap, simple preparation advantages, the most important is that it can be used at room temperature, thereby expanding the gas sensor range of applications. More systematic study of issues related to synthesis gas sensing performance and sensing mechanism of polyaniline. The main contents are as follows: chemical oxidation polymerization of aniline monomer, ammonium persulfate as oxidant synthesized polyaniline in acidic medium, different synthesis conditions on the performance of the product gas sensing, the results show that the acid doping after polyaniline has better sensitivity at room temperature on NH 3 ; using Fourier transform infrared spectroscopy and UV-visible spectra of polyaniline doped structural changes before and after the HCl, while taking advantage of the heat - differential thermal analysis techniques different acid doped polyaniline thermal stability test different proton acid doped polyaniline gas sensing performance results show that the macromolecular organic sulfonic acid doped polyaniline with compared to traditional HCl doped polyaniline, not only has better environmental stability, and the sensitivity has also been improved in different degrees, wherein the best effect of the sulfo acid (SSA) doped polyaniline, at room temperature under the 1000ppmNH 3 sensitivity reached 16; were prepared by mechanical blending SSA-PAn/SnO 2 and SSA-PAn/In 2 O 3 composite materials to improve the processability of polyaniline, the study results show that the gas-sensing properties of composite materials for SSA-PAn/SnO 2 , materials increase in sensitivity with SnO 2 increasing content of SnO 2 content of 50%, reaches a maximum, at room temperature on 1000ppmNH 3 a sensitivity of 25; SSA-PAn/In 2 O 3 , the sensitivity of In with 2 O 3 The increase of the content decrease. Compared with the single the SSA-PAN material, the composite material has a better workability and environmental stability.

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