Polypyrrole-Bonded Quaternary Semiconductor LiCuMo(2)O(11)–Graphene Nanocomposite for a Narrow Band Gap Energy Effect and Its Gas-Sensing Performance

[Image: see text] In this study, we demonstrate the fabrication and characterization of a new quaternary semiconductor nanocomposite of LiCuMo(2)O(11)/graphene oxide/polypyrrole (LCMGP) via a hydrothermal method and testing of an NH(3) and H(2)SO(4) sensor operating in gaseous states at room temperature. We used X-ray diffraction, transmission electron microscopy, scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy to characterize the properties of LCMGP nanostructures. Our sensor is capable of detecting NH(3) and H(2)SO(4) and quantifying their concentration in the gas flow. These results have been confirmed by exposing the sensor to different concentrations of NH(3) and H(2)SO(4) (100–1000 ppm). The obtained results confirm the exceptional sensing properties of the graphene–polymer-combined quaternary semiconductor nanocomposite related to the oxidation–reduction process that can be used for detection, identification, and quantification purposes.