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(a) Schematic of HEMT based sensor. (b) plan view photomicrograph of PEI/starch functionalized HEMT sensor.
Drain current of PEI/starch functionalized HEMT sensor measured at fixed source drain during the exposure to different concentration ambients. The drain bias voltage was and measurements were conducted at .
The drain current changes of HEMT sensor as a function of concentration. The inset is the current change in the sensors as function of lower concentrations (0.9%–10%).
Drain current of PEI/starch functionalized HEMT sensor as a function of time measured at a drain bias voltage of and at .
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