Abstract
The report is on high performance LPG gas sensor based ZnGa2O4/Graphene (ZGO/GR) structure by using facile hydrothermal approach. The heterostructure was characterized by X-ray diffraction (XRD), Field emission scanning electron microscope (FESEM), Transmission electron microscope (TEM), Raman and Brunauer-Emmett-Teller (BET) analysis. XRD results exposed that ZGO/GR is cubic phase with spinel structure. The fibers and platelets morphologies obtained were ZnGa2O4 and ZGO/GR sample, confirmed through FESEM and TEM analysis. Mesoporous with high porous nature and huge surface area (108 m2/g) of ZGO/GR hybrid samples was confirmed by N2 adsorption-desorption analysis. The resistive sensor was fabricated and the prepared sensors were evaluated towards LPG and NO2 gases with various concentrations at room temperature. The results deliver that the hybrid sensors have excellent sensing performance such as high sensitivity (52%), fast response (32 s) and recovery time (41 s) as well as high stability towards LPG gas. The obtained hybrid sensor is not only high sensitivity, it also high selectivity to LPG gas then other gas spices (NH3, ethanol, ammonia, CO and acetone). The improved mechanism is also proposed in detail.
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