成長單一方向氧化鋅奈米線及其光學、場發射、電子傳輸與光催化特性之分析

朱釜萱

doi:10.6842/NCTU.2011.00366

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成長單一方向氧化鋅奈米線及其光學、場發射、電子傳輸與光催化特性之分析

Well-aligned ZnO Nanowires: Synthesis, Optical, Field Emission, Electrical Transport and Photocatalytic Properties

朱釜萱 , Masters　　Advisor：吳文偉　　

繁體中文 DOI： 10.6842/NCTU.2011.00366

氧化鋅；奈米線；碳熱還原法；螢光光譜；光催化； ZnO ； nanowires ； carbothermal reduction ； PL ； photocatalytic

Abstract │ Reference (57) │ Times Cited (1) │ Altmetrics

Abstract 〈TOP〉

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In this study, we have successfully synthesized well-aligned ZnO nanowires (NWs) on Si(100) by using the process of carbothermal reduction and vapor-liquid-solid method. Scanning electron microscopy and transmission electron microscopy results confirm that ZnO NWs exhibit nearly perfect single crystal of wurtzite structure and grow along [0001] direction. The influences of substrate temperature, total pressure and oxygen partial pressure on the growth were discussed. Room temperature photoluminescence spectra of as-prepared ZnO NWs were recorded, which reveals a strong UV emission and a broad green emission. The green emission was resulted from oxygen vacancies, and the intensity increased as the decrease of partial oxygen pressure and the chamber pressure as well as the increase of ZnO NWs surface ratio. The well-aligned ZnO NWs show good field emission properties, and the constructed emitter of pencil-like ZnO NWs exhibit low turn-on field (3.82 V/μm) and high field enhancement factor(β= 2303). The electrical transport properties of a single ZnO NW field-effect transistors (FETs) prepared by the electron-beam lithography with a back-gate structure were investigated. The device exhibited the N-type semiconductor character, and the drain current can be controlled by changing gate voltage. Finally, we showed that as-prepared ZnO NWs with small diameter on substrate have good photocatalytic activity toward degradation of MB. We also added Au nanoparticles on the surface of ZnO NWs using e-gun deposition and annealing. The smaller Au nanoparticles decreased the recombination rate of hole-electron pair due to the greater of Fermi level shift to conduction band. Hence, adding Au nanoparticles that was a promising method to enhance the photocatalytic activity of ZnO NWs. It is significant that photocatalyst fabricated by ZnO NWs can apply to the degradation of organic pollution, and solved the environmental problems.

Reference ( 57 ) 〈TOP〉

1. A. Umar and Y.B. Hahn, "Metal oxide nanostructures and their applications." American Scientific Publishers 5 (2010).
連結：
2. E. Comini, C. Baratto, G. Faglia, M. Ferroni, A. Vomiero, and G. Sberveglieri, "Quasi-one dimensional metal oxide semiconductors: Preparation, characterization and application as chemical sensors." Progress in Materials Science 54, 1-67 (2009).
連結：
3. Z.L. Wang, " Nanostructures of zinc oxide." Materials Today 7, 26 (2004).
連結：
4. P.D. Yang and C.M. Lieber, "Nanostructured high-temperature superconductors: Creation of strong-pinning columnar defects in nanorod/superconductor composites." Journal of Materials Research 12, 2981-2996 (1997).
連結：
5. T.J. Trentler, K.M. Hickman, S.C. Goel, A.M. Viano, P.C. Gibbons, and W.E. Buhro, "Solution-liquid-solid growth of crystalline III-V semiconductors an analogy to vapor-liquid-solid growth." Science 270, 1791-1794 (1995).
連結：

Times Cited (1) 〈TOP〉

謝凱力(2012)。探索氧化鋅奈米線元件在不同電極尺度下的電性傳輸。交通大學電子物理系所學位論文。2012。1-54。

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