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The Preparation of In2O3 Nanomaterials with Different Phase Structures and Their Gas Sensing Properties

Author: WangBin
Tutor: GuoGuangSheng
School: Beijing University of Chemical Technology
Course: Chemical Engineering and Technology
Keywords: Indium oxide Nanomaterials Hydrothermal reaction Gas sensors
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 82
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Abstract


Indium oxide (In203) has a larger forbidden band width is an important oxide semiconductor , is widely used in solar cells , photocatalyst , and gas sensors , and many other fields . The In203 There are two crystal forms : cubic type (C-In2O3) and hexagonal (H-In2O3). InCl3 · 4H2O as raw materials in this paper hydrothermal ( solvothermal ) were prepared In (OH) 3 and InOOH precursor after calcination were two kinds of crystal indium oxide nanomaterials . The resulting material gas sensor to test its gas sensing performance differences and analyze the causes of the gas-sensing properties , compare different materials . The main tasks of this thesis is as follows : 1. Hydrothermal ( solvothermal ) method were prepared two kinds of crystal indium oxide nanomaterials studied different reaction conditions on the composition , structure and morphology . The results showed that in the the the lower hydrothermal reaction temperature , the initial temperature of the morphology of the precursor has a greater influence, this may be due to the ethylenediamine molecule plays a role of the templating agent ; When the temperature of the hydrothermal reaction is higher or ethylenediamine and the proportion of water is large , easy to generate InOOH precursor , and does not occur during calcination and in (OH) 3 and InOOH mutual conversion , the conversion between the two may occur in only a hydrothermal reaction stage , ethylenediamine InOOH generation play a key role . 2 to DEG and DMF as solvents, reaction step preparation of C -In2O3 influence of reaction conditions on product composition and morphology of the optimization of reaction conditions . The results showed that C-In2O3 DEG as solvent by one step reaction , by adding a small amount of water will procure In2O3 directly generate the presence of ethylenediamine would hinder In203 generated directly ; when DMF as solvent , the presence of a small amount of water but not the conducive In2O3 generated directly , in both cases the reaction temperature at 220 ℃ optimum . 3 will be made ??of different materials resulting gas sensors, gas sensing performance test of acetone and ethanol vapor , to determine the optimum operating temperature of various materials , the comparative material gas sensing performance differences , and the use of methods such as XPS and FL the gas sensing performance analysis of material reasons for the differences . The results showed that the thickness of the space charge layer of the material surface and the quantity of oxygen vacancies Gas sensing properties of the material have a significant effect .

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