Exploring the NH_3 gas sensing efficiency of polyvinylpyrrolidone based tungsten trioxide (PVP/WO_3) Nanocomposites: A recent progression in the toxic gas sensing materials

摘要

In this paper, a room temperature operable, highly reproducible, stable and selective ammonia gas sensor of PVP, WO_3, and PVP/WO_3 nanocomposites were investigated. Drop casting method was used to deposit the sensing materials on interdigitated copper electrode. Chemical reduction and ultrasonication methods were adopted for the preparation of WO_3 and PVP/WO_3 nanocomposites, respectively. The as-produced sensing materials were characterized by using FTIR, XRD, and SEM techniques. LCR meter was used to analyze the gas sensing properties of PVP, WO_3 and PVP/WO_3 (5-25 wt%) nanocomposites. Under same condition of temperature (300 K), humidity (40%RH), and NH_3 vapors (100 ppm) the sensor based on PVP/WO_3 20 wt% showed higher sensing response of 87.26 as compared to pure PVP and WO_3 nanosheets sensor which was 15.36 and 3.37, respectively. The PVP/WO_3 20 wt% based sensor exhibited excellent results in term of reproducibility, stability (90 days), response time (14 s), and recovery time (10 s).