rGO-wrapped porous LaFeO3 microspheres for high-performance triethylamine gas sensors

Abstract Design and synthesis of reduced graphene oxide (rGO) and metal oxide semiconductor composites with controlled morphology has been an enduring attracting research theme. In this work, we have prepared rGO sheets-wrapped porous LaFeO3 microspheres using via a simple electrostatic self-assembly strategy. The results show that the tight interface contact between LaFeO3 microspheres and rGO tablets is realized. Particularly, the prepared rGO/LaFeO3 nanocomposites have the advantages of high response speed and good selectivity for triethylamine (TEA). The superior gas sensing performance of the rGO/LaFeO3 nanocomposites can be attributed to the synergetic effects of rGO sheets and porous LaFeO3 microspheres. The unique hybrid structure in the rGO/LaFeO3 nanocomposites shows a significantly enhanced TEA sensing performance, which clearly reveals the advantages of structural design and a reasonable integration with the rGO nanosheets. The reported synthesis offers a commonly approach to perovskite-based semiconductor composites for effective gas sensing applications.