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Of SnO_2 , the In2O3 nanostructures prepared by chemical vapor deposition and its field emission , light-induced luminescence and chemical sensing performance

Author: WangXueWen
Tutor: YangHeQing
School: Shaanxi Normal University
Course: Materials Science
Keywords: SnO2 In2O3 Nanorod arrays Three-dimensional network nanostructures Four-fold symmetric nanostructures Low V-S Growth Chemical vapor deposition Field emission properties Photoluminescence Gas-sensitive sensor
CLC: TB383.1
Type: Master's thesis
Year: 2010
Downloads: 68
Quote: 0
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Abstract


The use of low-temperature chemical vapor deposition method (CVD), respectively, in the single crystal Si, SnO2 nanorod arrays prepared on FTO conductive glass and quartz glass substrate and SnO2 nanorods assembled structure of the flower-like microspheres. SnO2 nanorod arrays on Si substrates field emission (FE) performance, light-induced luminescence (PL) properties and surface wetting properties and photoconductive properties of SnO2 nanorods assembled flower-like structure of microspheres and ethanol acetone, triethylamine, and ammonia gas-sensitive sensor performance. Growth by in situ Prepared In2O3 three-dimensional network nanostructures and quadruple symmetrical hierarchical nanostructures possible growth mechanism, ethanol, acetone and triethylamine gas sensing pass In2O3 three-dimensional network nanostructures sense of characteristics. These studies for the preparation of SnO2 and In2O3 nanostructures, the study of the physical and chemical properties and the presence of emitting devices, gas sensors, optical detection devices and dye-sensitized solar cells and other fields of application laid a theoretical foundation. Specific study results are as follows: as the source material by a CVD method to a mixture of SnCl2 · 2H2O and ZnCl2, in a muffle furnace in air atmosphere, 600 ° C for reaction, respectively, prepared in the monocrystalline Si, quartz glass, and an FTO glass substrate highly oriented SnO2 nanorod arrays. SnO2 nanorod arrays controllable preparation of different sizes and different orientations to achieve by the reaction temperature and SnCl2 · 2H2O and ZnCl2 percentage change in the source material, the possible growth mechanism of SnO2 nanorod arrays and SnO2 polycrystalline thin films, The field emission properties, and field emission properties have been reported in the SnO2 other nanostructures. The results show that the upright SnO2 nanorod arrays with enhanced field emission properties, and have potential applications in the preparation of field emission devices. Study of SnO2 nanorods array of different sizes photoluminescence performance and surface wetting properties, for the first time found a SnO2 nanorod arrays in 424nm blue - green luminescence. By chemical vapor deposition (CVD) technology, in a tube furnace, SnCl · 2H2O and ZnCl2 as original material SiO2 substrate successfully prepared SnO2 nanorods self-assembled microsphere structure, using a scanning electron microscope (SEM), X ray powder diffraction (XRD) and transmission electron microscopy (TEM) of the products were characterized. Design a simple way to test the photoconductivity characteristics and gas sensing sensing characteristics of SnO2 thin film-like nanostructures. 254 nm and 365 nm UV irradiation IV characteristics of the samples, and found that the nanostructure of a wavelength of 254 nm UV response sensitivity up to 7.06. SnO2 nano-rods self-assembled microsphere structure at 350 ° C Operating Temperature sensing properties of different concentrations of ethanol, acetone, triethylamine and ammonia. The results show that the highest sensitivity of the nanostructure of triethylamine gas, the sensitivity with concentrations greater response - a shorter recovery time, and the concentration detection limits can be achieved 9 ppm. In a N2 gas atmosphere, As powder and ZnCl2 as catalyst, 700 ℃ reaction 1H metal in particle surface in situ growth of In2O3-dimensional net-like nanostructures. In2O3 four-fold symmetry nanostructure is obtained by changing the position of the AS of powder in a tube furnace. As powder and ZnCl2 in the three-dimensional mesh nanostructure formed In2O3 the role of possible growth mechanism. In2O3 3D mesh nanostructure the Gas sensing sensing properties of ethanol, acetone and triethylamine. The structure shows that the nanostructure has a lower limit of detection, higher sensitivity and faster response - recovery time. Among them, the limit of detection of acetone up to 1.7ppm.

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