Intrinsic Response of Graphene Vapor Sensors

Details Intrinsic Response of Graphene Vapor Sensors Intrinsic Response of Graphene Vapor Sensors

2008-11-19

arxiv.org/abs/0811.3091v1

Nano Lett., 2009, 9 (4), pp 1472 - 1475

Physics

Condensed Matter

Materials Science

9 pages and 2 figures

Scientific paper

10.1021/nl8033637

Graphene is a purely two-dimensional material that has extremely favorable chemical sensor properties. It is known, however, that conventional nanolithographic processing typically leaves a resist residue on the graphene surface, whose impact on the sensor characteristics of the system has not yet been determined. Here we show that the contamination layer both degrades the electronic properties of the graphene and masks graphene s intrinsic sensor responses. 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 graphene to be measured.

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