覆銠、銥於鎢針上產生的皺化行為及其相關研究

The faceting structures and related issues on Rh and Ir covered W tips

林砡君(Yu-Jun Lin)

指導教授 ： 傅祖怡

國立臺灣師範大學/理學院/物理學系/碩士(2004年)

摘要

無資料

關鍵字

銠 ； 銥 ； 皺化 ； 單元子針尖

並列摘要

The faceting structures and related issues on Rh and Ir covered W tips
Abstract
The faceting structures of Rh and Ir covered W tips are observed by field ion microscope. Two kinds of the single atom pyramidal tips are found for both of the Rh and Ir covered W tips. One we named type I , which the top three layers are constituted with 1, 3, and 10 atoms. The other we named type II , which constituted with 1, 6, and 15 atoms for the top three layers. To get the energy state of two kinds pyramidal tips, the appearance probability distribution are counted by repeated observing and annealing. The difference of activation barriers and binding energy of these two types are determined to be 0.08eV and 0.064eV for Rh covered single atom tip, and 0.05eV and 0.14eV for Ir covered single atom tip. Additionally, we found the double pyramidal structure on Ir covered W tip at 1029K. This new pyramid is sited on W{221} facet. Finally, we conclude the common phenomenon for Pd, Pt, Rh and Ir covered W single atom pyramidal tips and compare their different characters to provide users’ proper choice for different purposes.

參考文獻

[3]吳俊毅, 國立台灣師範大學碩士論文, 單原子尖度金字塔形鎢針的結構與應用之研究

[6] Hong-Shi Kuo, Ing-Shouh Hwang, Tsu-Yi Fu, Jun-Yi Wu, Che-Cheng and Tien T. Tsong, Nano Lett. 4, 2379-2382 (2004)

[2] Tsu-Yi Fu, Lung-Chieh Cheng, C.-H. Nien and Tien T. Tsong, Phys. Rev. B 64, 113401

[1] Hans-Werner Fink, IBM J. Res. Develop. 30, 460 (1986)

[7] Vu Thien Binh and S.T. Purcell,Appl. Phys. Lett. 111, 157-164 (1997)