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Preparation and Gas Sensing Properties of In2O3-based Nanomaterials with Different Structures

Author: WangJinXing
Tutor: WuFengQing
School: Jilin University
Course: Physical and chemical
Keywords: In2O3 Nanoparticle materials Nanofiber materials Nanosized mesoporous materials Gas sensors
CLC: TB383.1
Type: PhD thesis
Year: 2010
Downloads: 308
Quote: 1
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Abstract


Semiconductor metal oxides In 2 O 3 is an important functional materials, has been widely used because of its excellent physical and chemical properties of the solar cell, a transparent electrode, the photoelectric sensors, antistatic coatings, as well as the field of gas sensors. As a gas-sensitive material, the sensitive characteristics are strongly dependent on the nano-structure of the material (i.e., grain size, than the type of the surface area, the number of dimensions, the network and pore structure), and dopant. The papers prepared by different synthesis methods a different structure In the 2 O 3 based nanomaterials, material structure and the sensitive nature of the relationship between. In addition, by adding dopants to improve the sensitivity of the gas sensors to study the doping element sensitivity can impact performance preparation toxic and hazardous gas sensors. The main contents are as follows: 1 sol - gel prepared In 2 O 3 and the doping of Ag nanoparticles material. The synthetic crystal grain size of approximately of In 2 O 3 Debye length of two times, and provides a large number of active sites for the gas-sensitive reaction. In addition, the catalyst of Ag doped effectively avoid interference from other gases, and improve the sensitivity of the sensor and the response and recovery time. This sensor can be realized at a lower working temperature on the detection of formaldehyde. Using electrospinning technology, prepared In 2 O 3 doped Ag nanofiber materials. Synthetic nano-fibers having a high aspect ratio and the stability of the porous structure, is very conducive to gas adsorption and desorption reactions, and effectively avoid the decrease of the stability of the material due to agglomeration caused. The formaldehyde gas detection results show that the optimum doping ratio of Ag to 8 wt.%, Of formaldehyde exhibit fast response and recovery time (5-10 s) as well as a good stability. 3. Electrospinning technology, preparation the Ni doped In of 2 O 3 nanofiber materials. Characterization results show that in the doping process NI 2 partially substituted in 3 and the position of forming a substitution type solid solution In 2-x Ni < sub> x O 3 . The solid solution of trimethylamine performance, high sensitivity, fast response and recovery time as well as good stability and reproducibility. Superior to the sensitive nature of these nanofibers is mainly attributed to a combination of solid solution system with one-dimensional nanostructures. 4 hard template method, In (NO 3 ) 3 · 4.5H 2 O and Ni (the of NO 3 ) 2 · 6H 2 O filled to the mesoporous molecular sieve KIT-6 pore structure. Remove the template, synthesized Ni-doped In 2 O 3 nano mesoporous materials. Synthetic material characterization results show a highly ordered mesoporous structure and pore size distribution uniform. The gas-sensitive test results show, this nano-mesoporous sensitive material having a higher sensitivity than the fibrous structure to trimethylamine. This is mainly due to its mesoporous structure having a regular, uniform pore size and a large specific surface area. Through the above sections of the paper, a more systematic study of the structure of the gas-sensitive materials, the relationship between the synthetic methods and dopant gas sensing properties. The experimental and theoretical basis for improving the performance of gas sensors.

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