Transfer-Free Electrical Insulation of Epitaxial Graphene from its Metal Substrate

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• 作者：Silvano Lizzit ; Rosanna Larciprete ; Paolo Lacovig ; Matteo Dalmiglio ; Fabrizio Orlando ; Alessandro Baraldi ; Lauge Gammelgaard ; Lucas Barreto ; Marco Bianchi ; Edward Perkins ; Philip Hofmann
• 刊名：Nano Letters
• 出版年：2012
• 出版时间：September 12, 2012
• 年：2012
• 卷：12
• 期：9
• 页码：4503-4507
• 全文大小：269K
• 年卷期：v.12,no.9(September 12, 2012)
• ISSN：1530-6992

文摘

High-quality, large-area epitaxial graphene can be grown on metal surfaces, but its transport properties cannot be exploited because the electrical conduction is dominated by the substrate. Here we insulate epitaxial graphene on Ru(0001) by a stepwise intercalation of silicon and oxygen, and the eventual formation of a SiO₂ layer between the graphene and the metal. We follow the reaction steps by X-ray photoemission spectroscopy and demonstrate the electrical insulation using a nanoscale multipoint probe technique.

Keywords:

Graphene; epitaxial growth; electrical transport; X-ray photoelectron spectroscopy