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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.

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

Polypyrrole-Bonded Quaternary Semiconductor LiCuMo2O11–Graphene Nanocomposite for a Narrow Band Gap Energy Effect and Its Gas-Sensing Performance

Polypyrrole-Bonded Quaternary Semiconductor LiCuMo₂O₁₁–Graphene Nanocomposite for a Narrow Band Gap Energy Effect and Its Gas-Sensing Performance