TITLE:
Room-Temperature Humidity Sensing Using Graphene Oxide Thin Films
AUTHORS:
Gautam Naik, Sridhar Krishnaswamy
KEYWORDS:
Graphene, Thin Film, Sensor, Humidity, Hysteresis
JOURNAL NAME:
Graphene,
Vol.5 No.1,
December
3,
2015
ABSTRACT: In this article, we report on a room-temperature humidity sensing device using graphene oxide
(GO) thin films synthesized by chemical exfoliation. Changes in the device conductivity are measured
for varying relative humidity in the experimental chamber. Experiments are carried out for
relative humidity varying from 30% to 95%. We observe a difference in the results obtained for
low relative humidity (50%), and propose a sensing mechanism
to explain this difference. Although the sensor exhibits some hysteresis at high relative humidities,
a method to “reset” the sensor is also proposed. The sensing device has high sensitivity
and fast response time.