LPG sensing application of graphene/Bi2O3 quantum dots composites

• Graphene/Bi2O3 quantum dots composites were synthesized to detect LPG.
• The sensing response of chemiresistors is fast, stable and highly sensitive.
• Good relation is observed between the fluorescence intensity and sensing response.

Liquid petroleum gas (LPG) sensing characteristics of graphene/Bi2O3 quantum dots (QDs) composites have been studied. The prepared materials were characterized through X-ray diffraction, atomic force microscopy, Raman, high resolution-transmission electron microscopy along with selected area electron diffraction, ultraviolet–visible spectroscopy, fluorescence spectroscopy and thermo gravimetric-differential thermal analysis. The X-ray diffraction pattern of Bi2O3 showed broad peaks and intense absorption at 362 nm in UV–VIS spectrum confirms that chemically synthesized Bi2O3 particles are quantum dots. The composites show significant better performance towards the LPG. The defects chemistry was employed to analyse the increasing gas sensing properties with an increasing wt.% of graphene. Also, excellent correlation observed between the defects concentration (IUV/IDL) and sensing response as a function of wt.% of graphene.

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