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Studies On Preparation, Structure, Properties Of Low-Dimensional Oxide Of Semiconductor

Posted on:2005-10-07Degree:MasterType:Thesis
Country:ChinaCandidate:S F MaFull Text:PDF
GTID:2168360122998782Subject:Materials Processing Engineering
Abstract/Summary:PDF Full Text Request
Low-dimensional semiconductor oxides materials of ZnO andTiO2 which have peculiar properties were mainly studied. In this work, the synthesis, Microstructure and properties of tetrapod ZnO (T-ZnO) with hollow arms, nanowire and nanotube of TiO2 were researched here.T-ZnO hollow arms whiskers with three-dimensional structure which were first discovered and reported have been studied by our group. T-ZnO were synthesized through carbon thermal reduction method. Influencing factors of reaction such as temperature, time and quantity of reactant were studied. Their structures and some properties have been characterized by XRD, SEM, TEM, SAED, EDS, PL and so on. The results show that formation of T-ZnO is properly that twin-octahedron was first formed, and then four hollow arms grow on its alternating places. PL spectrum reveals that emission of intense green light under excitation. Otherwise, comb-like and net-like ZnO were achieved by same method.TiO2 has many important applications in areas including environmental purification, photo-catalyst, and high effect solar cell.TiO2 nanotubes were obtained by hydrothermal reaction from TiO2 and the mixture solution of NaOH. These nanotubes have open-ends, multiplayer and a wide distribution in size which outer diameter is about range of 6-50nm. Their structures and some properties have been characterized by XRD, SEM, TEM, HRTEM and PL. We also investigated the growth mechanism of nanotubes by the HRTEM observation of the naliotubes growth process. Moreover, UV-VIS absorption and PL experiments both show blue shift phenomena.TiO2 nanowires were also prepared by hydrothermal reaction. We characterized microstructure and crystal phase of nanowires too. The results showed that nanowires were anatase TiOa, diameter about 50nm, and length up to several micrometers. The nanowires and nanotubes with high specific surface area will play an important role in catalysis application.
Keywords/Search Tags:semiconductor nano-material, metal oxide, hydrothermal synthesis, tetropod hollow whisker, microstructure characterization, photoluminescence
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