title: Tuning surface-enhanced Raman scattering from graphene substrates using the electric field effect and chemical doping.
abstract: Graphene recently has been demonstrated to support surface-enhanced Raman scattering. Here, we show that the enhancement of the Raman signal of methylene blue on graphene can be tuned by using either the electric field effect or chemical doping. Both doping experiments show that hole-doped graphene yields a larger enhancement than one which is electron-doped; however, chemical doping leads to a significantly larger modulation of the enhancements. The observed enhancement correlates with the changes in the Fermi level of graphene, indicating that the enhancement is chemical in nature, as electromagnetic enhancement is ruled out by hybrid electrodynamical and quantum mechanical simulations.
authors: Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA ; Department of Physics, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.
authors: Qingzhen
authors: Q
authors: Hao
authors: Seth M
authors: SM
authors: Morton
authors: Bei
authors: B
authors: Wang
authors: Yanhui
authors: Y
authors: Zhao
authors: Lasse
authors: L
authors: Jensen
authors: Tony
authors: T
authors: Jun Huang
references: Proc Natl Acad Sci U S A. 2012 Jun 12;109(24):9281-6
references: 22623525
references: ACS Nano. 2010 Oct 26;4(10):5617-26
references: 20857921
references: Nano Lett. 2012 Mar 14;12(3):1571-7
references: 22335788
references: ACS Nano. 2011 Jul 26;5(7):5472-7
references: 21657215
references: Phys Rev Lett. 2006 Nov 3;97(18):187401
references: 17155573
references: Chem Rev. 2011 Jun 8;111(6):3962-94
references: 21344862
references: Nano Lett. 2010 Dec 8;10(12):4944-51
references: 21069971
references: Nat Nanotechnol. 2008 Oct;3(10):598-602
references: 18838998
references: Appl Phys Lett. 2012 Mar 5;100(10):101903-1019033
references: 22454552
references: Nano Lett. 2010 Feb 10;10(2):553-61
references: 20039694
references: Chem Soc Rev. 2008 May;37(5):1061-73
references: 18443690
references: J Chem Phys. 2011 Oct 7;135(13):134103
references: 21992278
references: J Phys Chem C Nanomater Interfaces. 2012 Apr 5;116(13):7249-7254
references: 24772200
references: Small. 2012 May 7;8(9):1365-72
references: 22359411
references: Small. 2011 Oct 17;7(20):2945-52
references: 21901822
references: Nat Nanotechnol. 2008 Apr;3(4):210-5
references: 18654505
references: ACS Nano. 2011 Feb 22;5(2):952-8
references: 21210657
references: J Am Chem Soc. 2009 Mar 25;131(11):4090-8
references: 19254020
references: Small. 2010 Sep 20;6(18):2020-5
references: 20730826
references: Nano Lett. 2008 Jan;8(1):173-7
references: 18085811
references: Sci Rep. 2012;2:586
references: 22905317
references: ACS Nano. 2008 Apr;2(4):707-18
references: 19206602
references: ACS Nano. 2011 Jul 26;5(7):5338-44
references: 21678950