Detail publikačního výsledku

Mechanistic insights into ethanol sensing by Pt-decorated WO3 nanowires

ŠIMŮNKOVÁ, H.; HRUSKA, M.; OTTA, J.; MISEK, J.; SMÍSITEL, P.; JANATA, M.; FITL, P.; VALLEJOS, S.; KOLÍBALOVÁ, E.; MATOLINOVA, I.; VOROCHTA, M.; VRNATA, M.; HUBÁLEK, J.

Originální název

Mechanistic insights into ethanol sensing by Pt-decorated WO3 nanowires

Anglický název

Mechanistic insights into ethanol sensing by Pt-decorated WO3 nanowires

Druh

Článek WoS

Originální abstrakt

This study investigates the fabrication and gas-sensing properties of Pt-decorated tungsten trioxide (WO3) nanowires (NWs) for chemiresistor applications. Single-standing WO3 and Pt/WO3 NWs were synthesized via aerosol-assisted chemical vapor deposition (AACVD) and assembled onto sensor chips using dielectrophoresis. Structural and morphological characterization was conducted using scanning electron microscopy (SEM), highresolution transmission electron microscopy (HR-TEM), and energy-dispersive X-ray spectroscopy (EDX). Sensor performance was evaluated through resistance measurements under varying ethanol concentrations and operating temperatures. Pt-decorated WO3 NWs demonstrated a significantly enhanced response compared to pristine WO3 NWs. It is also shown that Pt decoration resulted in an increased baseline resistance, consistent with electronic sensitization effects. Notably, Pt-functionalized sensors displayed a substantial response even at 100 degrees C, indicating promise for low-temperature operation. To elucidate the surface chemistry and electronic interactions during ethanol detection, near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) was employed. Based on this study, the superior sensing performance is attributed to the catalytic spill-over effect of Pt nanoparticles, charge transfer interactions, and the generation of surface oxygen vacancies. These findings offer valuable insights into the sensing mechanisms of noble metal-decorated metal oxide chemiresistors toward volatile organic compounds.

Anglický abstrakt

This study investigates the fabrication and gas-sensing properties of Pt-decorated tungsten trioxide (WO3) nanowires (NWs) for chemiresistor applications. Single-standing WO3 and Pt/WO3 NWs were synthesized via aerosol-assisted chemical vapor deposition (AACVD) and assembled onto sensor chips using dielectrophoresis. Structural and morphological characterization was conducted using scanning electron microscopy (SEM), highresolution transmission electron microscopy (HR-TEM), and energy-dispersive X-ray spectroscopy (EDX). Sensor performance was evaluated through resistance measurements under varying ethanol concentrations and operating temperatures. Pt-decorated WO3 NWs demonstrated a significantly enhanced response compared to pristine WO3 NWs. It is also shown that Pt decoration resulted in an increased baseline resistance, consistent with electronic sensitization effects. Notably, Pt-functionalized sensors displayed a substantial response even at 100 degrees C, indicating promise for low-temperature operation. To elucidate the surface chemistry and electronic interactions during ethanol detection, near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) was employed. Based on this study, the superior sensing performance is attributed to the catalytic spill-over effect of Pt nanoparticles, charge transfer interactions, and the generation of surface oxygen vacancies. These findings offer valuable insights into the sensing mechanisms of noble metal-decorated metal oxide chemiresistors toward volatile organic compounds.

Klíčová slova

Pt/WO3 Nanowires; Chemiresistors; Ethanol Detection; Surface Chemistry; In-Situ Study; NAP-XPS

Klíčová slova v angličtině

Pt/WO3 Nanowires; Chemiresistors; Ethanol Detection; Surface Chemistry; In-Situ Study; NAP-XPS

Autoři

ŠIMŮNKOVÁ, H.; HRUSKA, M.; OTTA, J.; MISEK, J.; SMÍSITEL, P.; JANATA, M.; FITL, P.; VALLEJOS, S.; KOLÍBALOVÁ, E.; MATOLINOVA, I.; VOROCHTA, M.; VRNATA, M.; HUBÁLEK, J.

Rok RIV

2026

Vydáno

15.03.2026

Periodikum

SENSORS AND ACTUATORS B-CHEMICAL

Číslo

451

Stát

Švýcarská konfederace

Strany počet

11

URL

https://www.sciencedirect.com/science/article/abs/pii/S0925400525020647?via%3Dihub

BibTex

@article{BUT200139,
  author="Helena {Šimůnková} and  {} and  {} and  {} and Petr {Smísitel} and  {} and  {} and  {} and Eva {Kolíbalová} and  {} and  {} and  {} and Jaromír {Hubálek}",
  title="Mechanistic insights into ethanol sensing by Pt-decorated WO3 nanowires",
  journal="SENSORS AND ACTUATORS B-CHEMICAL",
  year="2026",
  number="451",
  pages="11",
  doi="10.1016/j.snb.2025.139287",
  url="https://www.sciencedirect.com/science/article/abs/pii/S0925400525020647?via%3Dihub"
}