濺鍍法調控二氧化鈦奈米結構形貌及其光觸媒效應

林昭安

doi:10.6844/NCKU.2013.00061

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濺鍍法調控二氧化鈦奈米結構形貌及其光觸媒效應

Nanostructure morphology tuning of TiO2 using sputtering for the application of photocatalysis

林昭安 , Masters　　Advisor：張高碩　　

英文 DOI： 10.6844/NCKU.2013.00061

二氧化鈦奈米柱；光觸媒；高效能濺鍍法； TiO2 nanorods ； photocatalysis ； combinatorial sputtering

Abstract │ Reference (53) │ Times Cited (14) │ Altmetrics

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TiO2 is a promising photocatalyst due to its superior chemical, mechanical, and optical properties. However, the wide band gap ( 3.2 eV) of TiO2 has limited its application in the UV range. Band gap tuning  is extremely critical to extend its applications under visible light,. In addition, high aspect ratio morphology tuning, ex. nanorods structure, is another strategy to enhance its photocatalysis.
We have tried to grow TiO2 nanorods directly on a substrate by reactive sputtering. We have discussed the key factors to grow the TiO2 nanorod structure by sputtering, including the working distance, working pressure and substrate morphology. Nitrogen and chromium were incorporated into TiO2 nanorods to tune their band gaps. Various characterization tools such as GIXRD, SEM, TEM, and UV-vis were used to study the properties of TiO2 nanorods. Methylene blue (MB), which can be photodegraded, heavily depending on the morphology of TiO2, the amounts of Cr and N dopants, and the chemical environment (pH), was used as the target pollutant for a photodegradation test. We found N doped TiO2 nanorods made by the approach (b) and Cr-gradient doped TiO2 nanorods showed the best photodegraded efficiency at pH = 7. Modification of pristine TiO2 nanorods has been demonstrated an effective approach to enhance their photodegration ability.

Reference ( 53 ) 〈TOP〉

1. Linsebigler, A.L., G.Q. Lu, and J.T. Yates, PHOTOCATALYSIS ON TIO2 SURFACES - PRINCIPLES, MECHANISMS, AND SELECTED RESULTS. Chemical Reviews, 1995. 95(3): p. 735-758.
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2. Asahi, R., et al., Visible-light photocatalysis in nitrogen-doped titanium oxides. Science, 2001. 293(5528): p. 269-271.
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3. Fujishima, A. and K. Honda, ELECTROCHEMICAL PHOTOLYSIS OF WATER AT A SEMICONDUCTOR ELECTRODE. Nature, 1972. 238(5358): p. 37-+.
連結：
4. Frank, S.N. and A.J. Bard, HETEROGENEOUS PHOTOCATALYTIC OXIDATION OF CYANIDE AND SULFITE IN AQUEOUS-SOLUTIONS AT SEMICONDUCTOR POWDERS. Journal of Physical Chemistry, 1977. 81(15): p. 1484-1488.
連結：
6. Oregan, B. and M. Gratzel, A LOW-COST, HIGH-EFFICIENCY SOLAR-CELL BASED ON DYE-SENSITIZED COLLOIDAL TIO2 FILMS. Nature, 1991. 353(6346): p. 737-740.
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