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Visualizing Local Doping Effects of Individual Water Clusters on Gold(111)-Supported Graphene

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. https://resolver.caltech.edu/CaltechAUTHORS:20120507-073422918

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Abstract

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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1021/nl2041673 DOIArticle
http://pubs.acs.org/doi/abs/10.1021/nl2041673PublisherArticle
ORCID:
AuthorORCID
Heath, James R.0000-0001-5356-4385
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).
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG03-01ER46175
Subject Keywords:Graphene, local doping, water, substrate, gold, scanning tunneling microscopy
Issue or Number:3
Record Number:CaltechAUTHORS:20120507-073422918
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20120507-073422918
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 Letters 2012 12 (3), 1459-1463
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:31318
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:08 May 2012 18:34
Last Modified:03 Oct 2019 03:50

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