The Preparation And Property Of TiO₂ Nanotube

The nanotube materials , as a new type material , have many particular qualities which exhibit very wide application foreground . Its many specialities have intimate relation with this unique structure . The research of nanotube抯 microstructure has positive meaning for its forming mechanism, for improving preparation technique and even for artificially controlling the size of nanotube materials. is a broad band-gap semiconductor which has excellent quality and extensive useness Mading Ti02 into nanotube structure can improve its physical and chemical properties and extend its applications. Moreover , nanotube can be the templet of composite materials , which must bring out the potential application for new type materials. Comparing with carbon nanotube, the study on its preparation, forming mechanism and structure properties of Ti02 nanotube have just begun. These work have seldom been reported except for several paper . Therefore investigation in this aspect has an important significance and very strong exploration. Under this background , the preparation and the research structure propreties of Ti02 nanotube were carried out in this thesis. Some meaningful results were obtained for the further. They are shown in the below: This thesis mainly involve three parts: (1): Preparation, of Ti02 nanotubes Ti02 nanotube are successfully made by chemical synthesis method basing on literatures. TEM indicates that the nanotube has muti-layer structure, inner diameter is about 4.2?.9 nm and outer diameter is about 7.6? mm . This nanotube which have 5? times surface area than general Ti02 nanoparticles , is promising as high quality * catalyzer or catayzer carrier. DSR indicates Ti02 nanotube has strong interband III I B absorbance , which implies special energy band structure. This may have a strong influence on absorbance, fluorescence and light activity and its potential application. (2) The micro structure and the formation mechanism of Ti02 nanotube Ti02 nanotube have been studied by many means of characterization. The studies of micro-Raman spectra show there is a series of phase-change during the formation of nanotube structure from nanoparticles. The Raman spectra of Ti02 nanotube structure are very different from that of the nanoparticle: After the fonnation of nanotube , while the Raman peaks 146cm?640cm抰hat represent the cubic frame vibration of Eg phonon model remain, which indicate the Ti02 nanotube has the configuration of distortion cubic frame, there are two new characteristic vibration in Raman spectra :266cm?and 452cm? The experiments under high temperature prove the structure of Ti02 nanotube has changed during the increase of the temperature. At 400 it has changed totally to anatase; the DSC studies show the phase-transition was accompanied with the exothermic reaction at about 3800C. The studies of TG and JR show that the OH relaxation is related to the course. All of these showed that OW play a very important role in the formation of Ti02 nanotube from the nanoparticle: the strong basic circumstance firstly destroyed the original structure of nanoparticle Ti02 to...