Synthesis And Sensing Property Of One Dimensional Metal Oxide Nanocrystal

One-dimensional (ID) ZnO nanocrystals have been synthesized by hydrothermal and solvothermal process. The morphology, crystallinity, surface component and structure of crystals were characterized by SEM, TEM, XRD and XPS analysis. In order to optimize the process of ZnO synthesis, several methods and different synthesis condition have been compared and discussed.For investigated crystal growth mechanism, the ZnO nanocrystal syntheses by different base ratio and surfactant have been conducted in hydrothermal process. By comparing SDS-assisted and CTAB-assisted low-temperature hydrothermal synthesis, the effect of surfactant on the performance of gas sensing material was studied. The gas sensing selectivity of ZnO nanocrystal synthesis by CTAB-assisted low-temperature hydrothermal process was measured. And the effect of calcination temperature and time on ZnO response was systematically studied.In order to optimize the process, One-dimensional SnO2 nanocrystals have been synthesized by several methods. In order to modify the surface of SnO2 nanocrystal, Pd metal was doped on the SnO2 as secondary component. The morphology, crystallinity, surface component and structure of crystals were characterized by SEM, TEM, XRD, EDX and XPS analysis.In order to study the dynamics and thermodynamics of crystal growth factors, an orthogonal experiment was designed to investigate the effect of time and temperature, alkali concentration and the initial concentration on morphology of tin oxide crystals. The effect of calcination temperature on SnO2 response was discussed. In order to improve the gas sensing performance, the surface of SnO2 nanocrystal was modified.