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(a) AFM line scans of ssDNA on graphene. (b) AFM image with z-scale of 25 nm. White lines indicate the scan lines of (a). (c) characteristics for a graphene device through the steps of functionalization showing the expected doping shifts due to ssDNA application.
Normalized changes in current vs time for ssDNA-graphene vapor responses. Lower arrows indicate introduction of analyte at progressively larger concentrations, while upper arrows indicate flushing with pure carrier gas. Clean graphene devices (black data) show very weak vapor responses that are barely above the noise floor. Devices functionalized with sequence 1 (red data with squares) or sequence 2 (blue data with circles) show significant responses that are sequence-dependent. (a) Measurement of DMMP at concentrations of 20, 40, 60, 80, 100, and 120 ppm (b) Measurement of propionic acid at concentrations of 90, 220, 435, and 650 ppm.
Sensing response for several analytes.
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