Low-temperature NO₂ gas sensor fabricated with NiO and reduced graphene oxide hybrid structure

다국어 초록 (Multilingual Abstract)

<P><B>Abstract</B></P> <P>The fabrication of highly sensitive gas sensors that can monitor environmental toxic gases, such as nitrogen dioxide (NO<SUB>2</SUB>), which is one the most harmful gases to human health, attracts considerable attention. In this study, a hybrid structure composed of reduced graphene oxide (rGO) and a p-type NiO hierarchical structure (NiO-rGO) is fabricated using a facile solution process. The morphology and surface properties are analyzed by Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray diffraction, X-ray photoelectron spectroscopy, and scanning electron microscopy. The NO<SUB>2</SUB> sensitivity is enhanced by the high surface to volume ratio of the NiO hierarchical structures as well as the enhanced charge transfer of NiO to rGO. The fabricated sensor with a hierarchical NiO and rGO hybrid structure exhibiting high sensitivity and selectivity at a low temperature (100°C) with a rapid response time.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Low temperature operable and highly sensitive gas sensors were fabricated. </LI> <LI> The rGO plays important roles in effective charge transfer from NiO. </LI> <LI> The well-developed NiO flower structures on the rGO surface enhanced the sensitity. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>