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: A Study on Field Emission Characteristics of Planar Graphene Layers Obtained from a Highly Oriented Pyrolyzed Graphite Block | Nanoscale Res Lett 2009 4 1218-1221 DOI S11671-009-9384-9 NANO EXPRESS A Study on Field Emission Characteristics of Planar Graphene Layers Obtained from a Highly Oriented Pyrolyzed Graphite Block Seok Woo Lee Seung S. Lee Eui-Hyeok Yang Received 23 April 2009 Accepted 1 July 2009 Published online 12 July 2009 to the authors 2009 Abstract This paper describes an experimental study on field emission characteristics of individual graphene layers for vacuum nanoelectronics. Graphene layers were prepared by mechanical exfoliation from a highly oriented pyrolyzed graphite block and placed on an insulating substrate with the resulting field emission behavior investigated using a nanomanipulator operating inside a scanning electron microscope. A pair of tungsten tips controlled by the nanomanipulator enabled electric connection with the graphene layers without postfabrication. The maximum emitted current from the graphene layers was 170 nA and the turn-on voltage was V. Keywords Graphene Field emission Nanomanipulator Nanoelectronics Field emission is a quantum mechanical tunneling phenomenon in which electrons escape from a solid surface into vacuum as explained theoretically by R. H. Fowler and L. Nordheim in 1928. Field emission is widely used in many kinds of vacuum electronic applications such as flat panel displays microwave power tubes electron sources and electron-beam lithography. Over the past decade research groups worldwide have shown that carbon nanotubes CNTs are excellent candidates for electron emission 1 2 . CNTs possess advantages in aspect ratios tip S. W. Lee S. S. Lee Department of Mechanical Engineering KAIST Daejeon Korea . Yang H Department of Mechanical Engineering Stevens Institute of Science and Technology Hoboken NJ USA e-mail radius of curvature chemical stability and mechanical strength. However issues related to the placement and throughput of CNT arrays has hampered the development of such arrays .
