Charge transfer properties through graphene for applications in gaseous detectors

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• 作者：S. Franchino^a ; D. Gonzalez-Diaz^a ; R. Hall-Wilton^b ; R.B. Jackman^c ; H. Muller^a ; T.T. Nguyen^c ; R. de Oliveira^a ; E. Oliveri^a ; D. Pfeiffer^a ; ^b ; F. Resnati^a ; ^b ; ^{filippo.resnati@cern.ch" class="auth_mail" title="E-mail the corresponding author} ; L. Ropelewski^a ; J. Smith^c ; M. van Stenis^a ; C. Streli^d ; P. Thuiner^a ; ^d ; R. Veenhof^a ; ^e
• 关键词：Graphene ; Micro-Pattern Gaseous Detectors ; GEM ; Ion back-flow
• 刊名：Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
• 出版年：2016
• 出版时间：11 July 2016
• 年：2016
• 卷：824
• 期：Complete
• 页码：571-574
• 全文大小：471 K

文摘

Graphene is a single layer of carbon atoms arranged in a honeycomb lattice with remarkable mechanical and electrical properties. Regarded as the thinnest and narrowest conductive mesh, it has drastically different transmission behaviours when bombarded with electrons and ions in vacuum. This property, if confirmed in gas, may be a definitive solution for the ion back-flow problem in gaseous detectors. In order to ascertain this aspect, graphene layers of dimensions of about 2×2 cm², grown on a copper substrate, are transferred onto a flat metal surface with holes, so that the graphene layer is freely suspended. The graphene and the support are installed into a gaseous detector equipped with a triple Gaseous Electron Multiplier (GEM), and the transparency properties to electrons and ions are studied in gas as a function of the electric fields. The techniques to produce the graphene samples are described, and we report on preliminary tests of graphene-coated GEMs.