This thesis is divided into two parts. One focuses on the diffusion process of Ti atom on Si(111), and the other part aims on the nanostructures of GdSi1.7. Ti atom diffusion on Si(111) was investigated by scanning tunneling microscopy (STM) and density functional theory (DFT). The preferable adsorption sites and favorable diffusion paths are disclosed by STM and examined by DFT calculations. On the other hand, two distinct types of GdSi1.7 nanowires (NWs) were grown. The electrical properties of the epitaxial GdSi1.7 NWs were measured. The superb field emission properties were obtained on the free-standing GdSi1.7 NWs.

本論文主要分成兩大部分：第一部分著重在鈦原子在Si(111)-7×7表面的擴散過程研究；另一部分著重在GdSi1.7 的奈米結構研究。第一部分利用掃描穿隧式電子顯微鏡(STM)以及密度泛函理論(DFT)來觀察並討論鈦原子在Si(111)表面的吸附與擴散過程。優選的吸附位置與較易發生的擴散路徑皆藉由STM 觀察得到，並由DFT 的計算結果得到驗證。另一方面，藉由不同的基板成長了兩種不同型態的GdSi1.7 的奈米線(NWs)。首先測量討論在Si(001)上磊晶成長的GdSi1.7 奈米線的電性及電阻率。而對於直立(free-standing)成長的GdSi1.7 奈米線也對其優異的場發射特性做了一系列的量測與討論。

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4.13 Z. Li, S. Long, C. Wang, M. Liu, W. Wu, Y. Hao, and X. Zhao, “Resistivity measurements of self-assembled epitaxially grown erbium silicide nanowires,” J. Phys. D: Appl. Phys. 39, 2839-2842 (2006).
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Chapter 5
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5.20 S. A. Shakirova, and E. V. Serova, “Gd silicides formation heat treatment of coadsorbed Si and Gd ultrathin films on a W(1 1 1) surface,” Appl. Surf. Sci., 219, 363-369 (2003).
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5.24 C. Li, G. Fang, S. Sheng, Z. Chen, J. Wang, S. Ma, and X. Zhao, “Raman spectroscopy and field electron emission properties of aligned silicon nanowire arrays,” Physica E, 30, 169-173 (2005).
5.25 V. Filip, D. Nicolaescu, M. Tanemura, and F. Okuyama, “Modeling the electron field emission from carbon nanotube films,” Ultramicroscopy, 89, 39-49 (2001).
5.26 C. Y. Lee, M. P. Lu, K. F. Liao, W. F. Lee, C. T. Huang, S. Y. Chen, and L. J. Chen, “Free-standing single-crystal NiSi2 nanowires with excellent electrical transport and field emission properties,” J. Phys. Chem. C, 113, 2286-2289 (2009).
5.27 L. Nilsson, O. Groening, C. Emmenegger, O. Kuettel, E. Schaller, L. Schlapbach, H. Kind, J-M. Bonard, and K. Kern, “Scanning field emission from patterned carbon nanotube films,” Appl. Phys. Lett. 76, 2071-2072 (2000).
5.28 Y. L. Chueh, L. J. Chou, J. Song, and Z. L. Wang, “Mechanical and magnetic properties of Ni-doped metallic TaSi2 nanowires,” Nanotechnology, 18, 145604 (2007).
5.29 J. Choi, S. J. Oh, H. Ju, and J. Cheon, “Massive fabrication of free-standing one-dimensional Co/Pt nanostructures and modulation of ferromagnetism via a programmable barcode layer effect,” Nano Lett., 5, 2179-2183 (2005).
5.30 P. Crespo, R. Litra´n, T. C. Rojas, M. Multigner, J.M. de la Fuente, J. C. Sa´nchez-Lo´pez, M. A. Garcı´a, A. Hernando, S. Penade´s, and A. Ferna´ndez, “Permanent magnetism, magnetic anisotropy, and hysteresis of thiol-capped gold nanoparticles,” Phys. Rev. Lett. 93, 087204 (2004).
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Chapter 6
6.1 Z. Li, S. Long, C. Wang, M. Liu, W. Wu, Y. Hao, and X. Zhao, “Resistivity measurements of self-assembled epitaxially grown erbium silicide nanowires,” J. Phys. D: Appl. Phys. 39, 2839-2842 (2006).
6.2 H. Okino, I. Matsuda, R. Hobara, Y. Hosomura, and S. Hasegawa, “In situ resistance measurements of epitaxial cobalt silicide nanowires on Si(110),” Appl. Phys. Lett. 86, 233108 (2005).
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