Cao, Peigen and Varghese, Joseph O. and Xu, Ke and Heath, James R. (2012) Visualizing Local Doping Effects of Individual Water Clusters on Gold(111)-Supported Graphene. Nano Letters, 12 (3). pp. 1459-1463. ISSN 1530-6984 http://resolver.caltech.edu/CaltechAUTHORS:20120507-073422918
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The local charge carrier density of graphene can exhibit significant and highly localized variations that arise from the interaction between graphene and the local environment, such as adsorbed water, or a supporting substrate. However, it has been difficult to correlate such spatial variations with individual impurity sites. By trapping (under graphene) nanometer-sized water clusters on the atomically well-defined Au(111) substrate, we utilize scanning tunneling microscopy and spectroscopy to characterize the local doping influence of individual water clusters on graphene. We find that water clusters, predominantly nucleated at the atomic steps of Au(111), induce strong and highly localized electron doping in graphene. A positive correlation is observed between the water cluster size and the local doping level, in support of the recently proposed electrostatic-field-mediated doping mechanism. Our findings quantitatively demonstrate the importance of substrate-adsorbed water on the electronic properties of graphene.
|Additional Information:||© 2012 American Chemical Society. Received: November 27, 2011. Revised: January 31, 2012. Published: February 10, 2012. We thank the Department of Energy for support (DE-FG03-01ER46175).|
|Subject Keywords:||Graphene, local doping, water, substrate, gold, scanning tunneling microscopy|
|Official Citation:||Visualizing Local Doping Effects of Individual Water Clusters on Gold(111)-Supported Graphene Peigen Cao, Joseph O. Varghese, Ke Xu, and James R. Heath Nano Letters201212 (3), 1459-1463|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||08 May 2012 18:34|
|Last Modified:||26 Dec 2012 15:09|
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