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URN etd-0630104-002745 Statistics This thesis had been viewed 2890 times. Download 605 times. Author Ching-Hong Yang Author's Email Address email@example.com Department Materials Engineering Year 2004 Semester 2 Degree Master Type of Document Master's Thesis Language English Page Count 78 Title The Synthesis of Nano Hybrid CNTs/TiO2 Materials Keyword CNTs sol-gel TiO2 TiO2 sol-gel CNTs Abstract In recent years, carbon nanotubes have become intriguing materials, and have been studied in many fields of their unique properties such as high ratio of length to diameter, super strength, nano-scale structure, hydrogen storage, property of semiconductor and unknowable fields. In this experiment, the elaboration of an inorganic matrix containing embedded carbon nanotubes leads to a new nanocomposite. The possible applications of this CNTs nanocomposite are the intrinsic mechanical or electrical properties and gas sensing etc. In the study, the electrical properties of the new nanocomposite material have been examined. The carbon nanotubes provide the large surface area that can enhance the adsorption properties of gases and the conductivity at the room temperature for gas sensing.
In this study, TiO2 is prepared by sol-gel technique. The precursor was obtained by mixing titanium tetraisopropoxide and isopropyl alcohol. After mixing, the CNTs add and mix in the sol-gel solution. The methanol and deionic water are used to control the particle size and precipation of TiO2. Thin films of TiO2 and CNTs/TiO2 were deposited by a spin-coating method onto pre-cleaned silicon and alumina substrates. The CNTs/TiO2 thin film calcined in an electric furnace in air to 400℃. SEM, TEM, XRD, AFM and Raman instruments were examined the compositional and structural properties of these specimens.
Experiments results show the successful coating of TiO2 on the surface of carbon nanotubes by a sol-gel method. The surface morphology of TiO2 coated CNTs are likes the pearl necklace structure. The process of CNTs-hybridization shows the decreasing the sensing operation temperature and the enhancement the gas sensitivity for detecting CO gas at room temperature.
Advisor Committee Hong-Ming Lin - advisor
Files Date of Defense 2003-06-07 Date of Submission 2004-06-30