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<p>Metal-oxide-based nanocomposites have emerged as efficient materials for gas-sensing applications owing to their high surface activity and capability to detect hazardous gases at low concentrations. In the present work, MnO<sub>2</sub>–Fe<sub>2</sub>O<sub>3</sub> nanocomposites were synthesized successfully via a simple chemical combustion method and characterized using XRD, SEM, HR-TEM, EDS and other complementary techniques. Structural analysis confirmed the formation of tetragonal <i>β</i>-MnO<sub>2</sub> and rhombohedral <i>α</i>-Fe<sub>2</sub>O<sub>3</sub> phases, while the composite exhibited a mixed-phase structure. SEM revealed well-defined nanoporous morphology. The HR-TEM images further validated the nanostructured features of the synthesized material. The elemental composition of the pure and composite samples was confirmed by energy dispersive x-ray spectroscopy. The PL spectra show quenching of peak intensity in the composite sample suggesting the formation of oxygen vacancies. Gas-sensing studies demonstrated that the MnO<sub>2</sub>–Fe<sub>2</sub>O<sub>3</sub> nanocomposite exhibited significantly enhanced ethanol sensing performance, with a sensitivity of 62.89% toward 24&#xa0;ppm ethanol at an optimum operating temperature of 300&#xa0;°C. The superior sensing behavior is attributed to the formation of an n–n heterojunction between MnO<sub>2</sub> and Fe<sub>2</sub>O<sub>3</sub>, which facilitates charge transfer, improves conductivity, thereby enhancing sensor sensitivity. These results suggest that MnO<sub>2</sub>–Fe<sub>2</sub>O<sub>3</sub> nanocomposites hold strong potential for application in highly sensitive ethanol gas sensors.</p>

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Facile combustion synthesis of MnO2–Fe2O3 nanocomposites: interface-driven ethanol gas sensing with enhanced response and stability

  • 期刊论文

  • 发表日期：

    2026年4月18日

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  • K. S. Pakhare,
  • S. S. Potdar,
  • M. C. Naik,
  • B. M. Sargar,
  • G. M. Kharmate,
  • I. S. Jamadar,
  • A. B. Deore

摘要

Metal-oxide-based nanocomposites have emerged as efficient materials for gas-sensing applications owing to their high surface activity and capability to detect hazardous gases at low concentrations. In the present work, MnO2–Fe2O3 nanocomposites were synthesized successfully via a simple chemical combustion method and characterized using XRD, SEM, HR-TEM, EDS and other complementary techniques. Structural analysis confirmed the formation of tetragonal β-MnO2 and rhombohedral α-Fe2O3 phases, while the composite exhibited a mixed-phase structure. SEM revealed well-defined nanoporous morphology. The HR-TEM images further validated the nanostructured features of the synthesized material. The elemental composition of the pure and composite samples was confirmed by energy dispersive x-ray spectroscopy. The PL spectra show quenching of peak intensity in the composite sample suggesting the formation of oxygen vacancies. Gas-sensing studies demonstrated that the MnO2–Fe2O3 nanocomposite exhibited significantly enhanced ethanol sensing performance, with a sensitivity of 62.89% toward 24 ppm ethanol at an optimum operating temperature of 300 °C. The superior sensing behavior is attributed to the formation of an n–n heterojunction between MnO2 and Fe2O3, which facilitates charge transfer, improves conductivity, thereby enhancing sensor sensitivity. These results suggest that MnO2–Fe2O3 nanocomposites hold strong potential for application in highly sensitive ethanol gas sensors.