Here, we present a room temperature operating chemi-sensor based on a graphene film that shows sensitivity to NO2 up to a 50 parts-per-billion (ppb) with extremely limited interference from relative humidity and can be also calibrated in a sub-parts-per-million (ppm) range with a response and recovery time of few seconds. The device has been fabricated using as active material, a solution of graphene nanosheets suspended in N-methyl-pyrrolidone drop casted on an alumina substrate with gold interdigitated electrodes. The derivative of the device response is found to be univocally correlated to NO2 concentrations from 100ppb up to 1000ppb and the sensor can therefore be calibrated in this same range. © 2014 AIP Publishing LLC.
|Titolo:||A calibrated graphene-based chemi-sensor for sub parts-per-million NO 2 detection operating at room temperature|
|Data di pubblicazione:||2014|
|Appare nelle tipologie:||1.1 Articolo in rivista|