title: Highly stable carbon nanotube field emitters on small metal tips against electrical arcing.
abstract: Carbon nanotube (CNT) field emitters that exhibit extremely high stability against high-voltage arcing have been demonstrated. The CNT emitters were fabricated on a sharp copper tip substrate that produces a high electric field. A metal mixture composed of silver, copper, and indium micro- and nanoparticles was used as a binder to attach CNTs to the substrate. Due to the strong adhesion of the metal mixture, CNTs were not detached from the substrate even after many intense arcing events. Through electrical conditioning of the as-prepared CNT emitters, vertically standing CNTs with almost the same heights were formed on the substrate surface and most of loosely bound impurities were removed from the substrate. Consequently, no arcing was observed during the normal operation of the CNT emitters and the emission current remained constant even after intentionally inducing arcing at current densities up to 70 mA/cm2.
authors: Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology (KAIST), 373-1 Guseong, Yuseong, Daejeon 305-701, Republic of Korea. socho@kaist.ac.kr.
authors: Jun Mok
authors: JM
authors: Ha
authors: Hyun Jin
authors: HJ
authors: Kim
authors: Hamid Saeed
authors: HS
authors: Raza
authors: Sung Oh
authors: SO
authors: Cho
references: Phys Rev Lett. 2004 Aug 13;93(7):075501
references: 15324247
references: Rev Sci Instrum. 2007 Jan;78(1):013305
references: 17503916
references: Nature. 2002 Nov 28;420(6914):393-5
references: 12459778
references: Nanoscale Res Lett. 2012 May 17;7(1):258
references: 22594627
references: Nanotechnology. 2009 Aug 12;20(32):325707
references: 19620758
references: Phys Rev Lett. 2002 Mar 11;88(10):105502
references: 11909368