Impact of Doping on GO: Fast Response–Recovery\nHumidity Sensor

Abstract

Nowadays, humidity\nsensors have become essential in numerous applications.\nHowever, there are several problems while using them for humidity\ndetection, such as low sensitivity, delayed response and recovery\ntimes, less stability, and narrow humidity detection ranges. Here,\nwe demonstrate for the first time a highly sensitive chemiresistive\nsensor for low-level humidity detection in ambient atmosphere by introducing\ngraphene oxide (GO) and doped GO (Li-doped GO and B-doped GO) as a\nthin film in a facile manner. The sensitivity, repeatability, and\nstability studies show that thin film-based fabricated humidity sensors\nare unprecedently efficient in the detection of different percentages\nof humidity from 11 to 97% at room temperature. The incorporation\nof doping into GO induces a dramatic change in the sensing behavior\nof the base film (undoped GO). This allows the sensor to be used in\na variety of applications such as humidity sensing, which we validate\nthrough our experiment with a “cheap and readily available”\nrecognition system.