Sensitivity Enhancement of Ammonia Gas Sensor Based on Hydrothermally Synthesized rGO/WO3 Nanocomposites

An ultrasensitive ammonia gas sensor based on hydrothermally synthesized rGO/WO3 nanocomposite with interdigitated chromium electrode has been fabricated. Device properties such as structural, morphological, optical, and electrical were analyzed and reported. A correlation between stability and performance of the device with electrical properties has been established. Sensor shows excellent selectivity and sensitivity towards ammonia detection, even at lower gas concentration and low operating temperature. At room temperature, the sensor depicts the sensing response 4.35 with 13/20 sec response/recovery time for 10 PPM NH3 gas concentration. Although the best sensing performance has been obtained for 150 & x00B0;C operating temperature. For 10 PPM and 100 PPM NH3 gas concentration, we found sensor response 10.89 and 27.7 with 11/17 and 7/19 sec response/recovery time. The sensor has been tested for different period/interval of time and found that the proposed nanocomposite has excellent stability and reproducibility thus can be utilized for various gas sensing applications.