Low-temperature selectivity study of chemically treated graphene oxide for detection of hydrogen gas

Abstract

Chemically Reduced Graphene Oxide (CRGO) based resistive gas sensor exhibits exceptional hydrogen (H2) selectivity. The device sensitivity in the temperature range, room temperature (RT)-150 °C, was tested. A response of 1.83% towards hydrogen at RT, and nil cross-sensitivity to carbon monoxide (CO) and methane (CH4) gases was observed. The devices also showed hydrogen selectivity at elevated temperatures (≥75 °C). However, the nature of hydrogen sensing showed a typical transition upon increasing the temperature. A suitable sensing mechanism is used to explain the selective device characteristics at different temperatures.