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

Abstract

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.

Cu- and Sn-Codoped Mesoporous BaTiO3-G-SiO2 Nanocomposite for Bioreceptor-Free, Sensitive, and Quick Electrochemical Sensing of Rhizopus stolonifer Fungus

“…Electrochemical sensors using graphene have shown exceptional performance. Graphene is a single layer of graphite, with a two-dimensional plane of sp 2 -linked carbon atoms organized in a honeycomb lattice structure with a single-atom thickness. − Because of its high surface to volume ratio and better π-stacking contact between hexagonal cells and carbon-based ring structures, it also efficiently adsorbs biomolecules . Graphene is commonly studied to improve absorbability in biosensors .…”

Synthesis of Polypyrrole and Its Derivatives as a Liquid Marble Stabilizer via a Solvent-Free Chemical Oxidative Polymerization Protocol

“…Polypyrrole (PPy) is a promising conjugated polymer that was reported in a scientific journal for the first time more than 100 years ago , and has been applied to electrodes, antistatic coating, gas/metal ion adsorbents, sensors, actuators, biomaterials, and models for micrometeorites because of its tunable electrical conductivity, coloration, biocompatibility and environmental stability. − PPy has been widely synthesized by chemical oxidative polymerization of pyrrole (Py) using ferric chloride (FeCl 3 ) as an oxidant in aqueous media, which is a simple and cost-effective process. In addition to PPy, PPy derivatives carrying an alkyl group at the N -position of the Py ring, namely poly­( N -methylpyrrole) (PMPy) and poly­( N -ethylpyrrole) (PEPy), have also received interest because of their potential applications as biosensors, antibacterial agents and anticorrosions, and electrodes. − Similar to PPy, PMPy and PEPy have been synthesized by chemical oxidative polymerization in liquid media, such as water and chloroform.…”

A flexible mesoporous Cu doped FeSn–G–SiO2composite based biosensor for microalbumin detection

“…[10][11][12][13] Research on the absorbability of biosensors using graphene is prevalent. [14][15][16][17] In addition, Cudoping in nanoparticles is widely regarded as an effective method to enhance device performance by increasing electrical conductivity. 18 The combination of mesoporous SiO 2 with graphene was used to improve biosensor performance as a channel material by improving the surface area and active site.…”