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Updated: May 28, 2025

Preparation and Use of Photocatalytically Active Segmented Ag|ZnO and Coaxial TiO2-Ag Nanowires Made by Templated Electrodeposition

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WO_3-x/WS₂ Nanocomposites for Fast-Response Room Temperature Gas Sensing.

Svetlana S Nalimova¹, Zamir V Shomakhov², Oksana D Zyryanova¹

¹Micro- and Nanoelectronics Department, Saint Petersburg Electrotechnical University "LETI", Professora Popova 5, 197022 Saint Petersburg, Russia.

Molecules (Basel, Switzerland)

|February 13, 2025

Summary

New semiconductor gas sensors using WO3-x/WS2 nanostructures operate effectively at room temperature. These materials show significant potential for gas detection applications with rapid response and recovery times.

Keywords:

WO3−x/WS2 nanostructures alcohol vapor detection hydrothermal method room temperature semiconductor gas sensor

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Area of Science:

Materials Science
Nanotechnology
Chemical Sensing

Background:

Semiconductor gas sensors are crucial for environmental, industrial, and medical applications.
A key challenge is reducing their operating temperature to room temperature for energy efficiency and portability.
WO3-x/WS2 nanostructures offer a promising avenue for developing low-temperature gas sensors.

Purpose of the Study:

To synthesize and characterize WO3-x/WS2 nanostructures for gas sensing applications.
To investigate the performance of these nanostructures at room temperature.
To evaluate their response to alcohol vapors.

Main Methods:

Hydrothermal synthesis method for creating WO3-x/WS2 nanostructures.
Surface morphology and elemental composition analysis using techniques like SEM and EDX.
Optical band gap determination.
Gas sensing measurements of resistance changes upon exposure to alcohol vapors.

Main Results:

WO3-x/WS2 nanostructures were successfully synthesized and characterized.
The sensor layers demonstrated significant resistance changes in response to isopropanol and ethanol vapors at room temperature.
High sensitivity was observed, with a response value of 1.25 to 1000 ppm isopropanol (13s response, 12s recovery) and 1.35 to 1000 ppm ethanol (20s response, 20s recovery).

Conclusions:

The developed WO3-x/WS2 nanostructures are effective for room-temperature gas sensing.
The materials exhibit excellent response and recovery characteristics for alcohol detection.
These nanostructures hold considerable promise for practical gas sensor applications.