tailieunhanh - Báo cáo hóa học: "Enhanced Field Emission from Argon Plasma-Treated Ultra-sharp a-Fe2O3 Nanoflakes"

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: Research Enhanced Field Emission from Argon Plasma-Treated Ultra-sharp a-Fe2O3 Nanoflakes | Nanoscale Res Lett 2009 4 1115-1119 DOI S11671-009-9363-1 NANO IDEAS Enhanced Field Emission from Argon Plasma-Treated Ultra-sharp a-Fe2O3 Nanoflakes Z. Zheng L. Liao B. Yan J. X. Zhang Hao Gong Z. X. Shen T. Yu Received 6 February 2009 Accepted 26 May 2009 Published online 12 June 2009 to the authors 2009 Abstract Hematite nanoflakes have been synthesized by a simple heat oxide method and further treated by Argon plasmas. The effects of Argon plasma on the morphology and crystal structures of nanoflakes were investigated. Significant enhancement of field-induced electron emission from the plasma-treated nanoflakes was observed. The transmission electron microscopy investigation shows that the plasma treatment effectively removes amorphous coating and creates plenty of sub-tips at the surface of the nanoflakes which are believed to contribute the enhancement of emission. This work suggests that plasma treatment technique could be a direct means to improve fieldemission properties of nanostructures. Keywords Field emission Metal oxide Plasma treated Introduction One-dimensional 1-D and quasi-1-D nanostructures due to their high crystal quality large aspect ratio and sharp tips are well known as promising candidates for applications related to cold cathode field emission of electrons 1 . Field emission also called Fowler-Nordheim tunneling 2 is a form of quantum tunneling in which Z. Zheng L. Liao B. Yan Z. X. Shen T. Yu El Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University Singapore 637371 Singapore e-mail yuting@ J. X. Zhang H. Gong Department of Materials Science and Engineering National University of Singapore Blk E3A 9 Engineering Drive 1 117576 Singapore Singapore electrons pass through a barrier in the presence of a high electric field. This phenomenon is highly dependent on both the structural properties of materials and the shape of particular cathode. Practically high .