Connecting Dopant Bond Type with Electronic Structure in N-Doped Graphene
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- 作者：Theanne Schiros ; Dennis Nordlund ; Lucia P谩lov谩 ; Deborah Prezzi ; Liuyan Zhao ; Keun Soo Kim ; Ulrich Wurstbauer ; Christopher Guti茅rrez ; Dean Delongchamp ; Cherno Jaye ; Daniel Fischer ; Hirohito Ogasawara ; Lars G. M. Pettersson ; David R. Reichman ; Philip Kim ; Mark S. Hybertsen ; Abhay N. Pasupathy
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：August 8, 2012
- 年：2012
- 卷：12
- 期：8
- 页码：4025-4031
- 全文大小：369K
- 年卷期：v.12,no.8(August 8, 2012)
- ISSN：1530-6992
文摘
Robust methods to tune the unique electronic properties of graphene by chemical modification are in great demand due to the potential of the two dimensional material to impact a range of device applications. Here we show that carbon and nitrogen core-level resonant X-ray spectroscopy is a sensitive probe of chemical bonding and electronic structure of chemical dopants introduced in single-sheet graphene films. In conjunction with density functional theory based calculations, we are able to obtain a detailed picture of bond types and electronic structure in graphene doped with nitrogen at the sub-percent level. We show that different N-bond types, including graphitic, pyridinic, and nitrilic, can exist in a single, dilutely N-doped graphene sheet. We show that these various bond types have profoundly different effects on the carrier concentration, indicating that control over the dopant bond type is a crucial requirement in advancing graphene electronics.