Lu, Ye

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2009 - 20102
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  • Publication
    DNA-decorated Graphene Chemical Sensors
    (2010-01-01) Lu, Ye; Goldsmith, Brett R; Kybert, Nicholas; Johnson, Charlie
    Graphene is a two-dimensional material with exceptional electronic properties and enormous potential for applications. Graphene’s promise as a chemical sensor material has been noted but there has been little work on practical chemical sensing using graphene, and in particular, how chemical functionalization may be used to sensitize graphene to chemical vapors. Here we show one route towards improving the ability of graphene to work as a chemical sensor by using single stranded DNA as a sensitizing agent. The resulting devices show fast response times, complete and rapid recovery to baseline at room temperature, and discrimination between several similar vapor analytes.
  • Publication
    Intrinsic Response of Graphene Vapor Sensors
    (2009-03-06) Dan, Yaping; Lu, Ye; Luo, Zhengtang; Johnson, A.T. Charlie; Kybert, Nicholas J
    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.