Intrinsic Response of Graphene Vapor Sensors

Graphene is a two-dimensional material with extremely favorable chemical sensor properties. Conventional nanolithography typically leaves a resist residue on the graphene surface, whose impact on the sensor characteristics has not yet been determined. Here we show that the contamination layer chemic...

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Bibliographic Details
Published in:Nano letters 2009-04, Vol.9 (4), p.1472-1475
Main Authors: Dan, Yaping, Lu, Ye, Kybert, Nicholas J, Luo, Zhengtang, Johnson, A. T. Charlie
Format: Article
Language:English
Subjects:
Cross-disciplinary physics: materials science
rheology
Exact sciences and technology
Fullerenes and related materials
diamonds, graphite
General equipment and techniques
Instruments, apparatus, components and techniques common to several branches of physics and astronomy
Materials science
Methods of nanofabrication
Nanolithography
Physics
Sensors (chemical, optical, electrical, movement, gas, etc.)
remote sensing
Specific materials
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Summary:Graphene is a two-dimensional material with extremely favorable chemical sensor properties. Conventional nanolithography typically leaves a resist residue on the graphene surface, whose impact on the sensor characteristics has not yet been determined. Here we show that the contamination layer chemically dopes the graphene, enhances carrier scattering, and acts as an absorbent layer that concentrates analyte molecules at the graphene surface, thereby enhancing the sensor response. We demonstrate a cleaning process that verifiably removes the contamination on the device structure and allows the intrinsic chemical responses of the graphene monolayer to be measured. These intrinsic responses are surprisingly small, even upon exposure to strong analytes such as ammonia vapor.
ISSN:1530-6984
1530-6992
DOI:10.1021/nl8033637