Liquid petroleum gas-sensing behaviour of graphene/SrO quantum dots (QDs) composites was investigated. Structure and morphology of prepared materials were analysed through X-ray diffraction (XRD) and transmission electron microscopy along with selected-area diffraction pattern. The optical properties were analysed through fluorescence spectroscopy. The thermal behaviour of optimized sensing material was examined using thermogravimetric differential thermal analysis (TG-DTA). The gas-sensing properties of composites were measured by resistance change as a function of gas concentration. A notable better sensing performance was observed for liquefied petroleum gas (LPG). The enhanced gas-sensing properties with increasing amount of graphene are discussed by using defect chemistry. A good correlation is observed between the fluorescence intensity ratio (I UV/I DL) and the sensing response as a function of the amount of graphene.
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Nemade et al. (2013) studied this question.
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