By E. L. Wolf
Graphene is gifted and analyzed in its place for silicon. the first concentration is on sunlight mobilephone and CMOS gadget applied sciences, with consciousness to the fabrication equipment, together with extensions wanted, in each one case. really expert purposes for graphene in the current silicon expertise are mentioned and located to be promising.
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Extra info for Applications of Graphene: An Overview
Sample text
1998); Affoune et al. (2001); Harigaya and Enoki (2002). Limited solubility of C in the substrate can restrict the production to single layers of graphene, a desirable outcome. An important discovery of Reina et al. (2008) was that single crystal (and, later, also continuous polycrystalline CVD) graphene could be released from the traditional oxidized silicon substrate to be relocated to a different target substrate. The steps used by Reina et al. (2008) include covering (spin-coating) the film with poly(methyl methacrylate) (PMMA, 950,000 molecular weight, 9–6 wt % in anisole), followed by partially etching the surface of the SiO2 in 1 M NaOH aqueous solution.
A useful summary of synthesis methods for graphene with emphasis on patent applications filed has been given by Samba Sivudu and Mahajan (2012). php 38 2 Practical Productions of Graphene, Supply and Cost The patent survey suggests that large companies (Samsung leading with 16 patent applications) focus on CVD methods (92 patent applications total) suitable for electronics, while small companies (see also Segal 2009) including Angstron Materials, XG Sciences, Vorbeck Materials Corp, focus on exfoliation methods for small platelets (94 patent applications total).
The result, a large-area, ‘‘release tape’’ polymer/graphene/copper sheet sandwich is then rolled through a chemical bath to remove the copper. The next step is to place the graphene side of the assembled sheet onto the substrate of final choice, that is often a roll of 188 lm thick polyethylene terephthalate (PET). 4 Chemical Vapor Deposition-Based Methods CVD 33 sandwich between rollers at mild heat *100 °C transfers the graphene from the ‘‘thermal release tape’’ to the desired final support. In typical cases the procedure is iterated to give a stack of four graphene layers (whose azimuthal orientations are random) on the wide area PET supporting sheet, and with diagonal dimension as large as 30 in.