tailieunhanh - Báo cáo hóa học: " Field Emission Properties and Fabrication of CdS Nanotube Arrays"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Field Emission Properties and Fabrication of CdS Nanotube Arrays | Nanoscale Res Lett 2009 4 955-961 DOI S11671-009-9324-8 NANO PERSPECTIVES Field Emission Properties and Fabrication of CdS Nanotube Arrays Xuemin Qian Huibiao Liu Yanbing Guo Shiqun Zhu Yinglin Song Yuliang Li Received 23 February 2009 Accepted 14 April 2009 Published online 5 May 2009 to the authors 2009 Abstract A large area arrays ca. 40 cm2 of CdS nanotube on silicon wafer are successfully fabricated by the method of layer-by-layer deposition cycle. The wall thicknesses of CdS nanotubes are tuned by controlling the times of layer-by-layer deposition cycle. The field emission FE properties of CdS nanotube arrays are investigated for the first time. The arrays of CdS nanotube with thin wall exhibit better FE properties a lower turn-on field and a higher field enhancement factor than that of the arrays of CdS nanotube with thick wall for which the ratio of length to the wall thickness of the CdS nanotubes have played an important role. With increasing the wall thickness of CdS nanotube the enhancement factor b decreases and the values of turn-on field and threshold field increase. X. Qian S. Zhu Y. Song School of Physical Science and Technology Suzhou University Suzhou Jiangsu Province 215006 People s Republic of China e-mail ylsong@ X. Qian e-mail qianxuemin1813@ S. Zhu e-mail szhu@ X. Qian H. Liu Y. Guo Y. Li Beijing National Laboratory for Molecular Sciences BNLMS CAS Key Laboratory of Organic Solid Institute of Chemistry Chinese Academy of Sciences Beijing 100190 People s Republic of China e-mail liuhb@ Y. Guo e-mail guoyb@ Y. Li e-mail ylli@ Keywords CdS Nanotube arrays Layer-by-layer deposition Field emission Introduction One-dimensional semiconductor nanostructures have been intensively investigated in recent years due to their interesting optical and electronic properties and promising applications in nanoscale devices 1-3 . Among the II-VI semiconductors CdS has been attracted special .