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Updated: Feb 28, 2026

Aerosol-assisted Chemical Vapor Deposition of Metal Oxide Structures: Zinc Oxide Rods

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Published on: September 14, 2017

NO₂ Gas Sensor Based on WO₃/SiNWs Composite Structure.

Fengyun Sun¹, Encheng Zhang²

¹Engineering College, China University of Petroleum-Beijing at Karamay, Karamay 834000, China.

|February 27, 2026

Summary

This summary is machine-generated.

This study presents a novel tungsten oxide/silicon nanowire (WO3/SiNWs) heterojunction sensor for detecting nitrogen dioxide (NO2). The new sensor achieves high sensitivity at low temperatures, offering a promising solution for efficient gas sensing applications.

Keywords:

NO2 gas sensing SiNWs WO3 heterojunction

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Published on: October 3, 2015

Area of Science:

Materials Science
Chemical Engineering
Nanotechnology

Background:

Tungsten oxide (WO3)-based sensors are widely used for nitrogen dioxide (NO2) detection.
A key challenge is enhancing sensitivity at low operating temperatures for energy efficiency.

Purpose of the Study:

To develop a high-performance WO3/SiNWs heterojunction sensor for NO2 detection.
To improve sensor sensitivity and operating efficiency at lower temperatures.

Main Methods:

Fabrication of WO3/SiNWs heterojunction using metal-assisted chemical etching and hydrothermal synthesis.
Characterization of structural and morphological properties.
Performance evaluation of the sensor for NO2 detection at various temperatures.

Main Results:

Uniform integration of WO3 nanorods onto SiNWs confirmed.
Effective p-n junction formation in the WO3/SiNWs heterojunction.
Optimized sensor achieved a response of 238 to 1 ppm NO2 at 127 °C.
Rapid response (14.8 s) and recovery (99.2 s) times were recorded.

Conclusions:

The WO3/SiNWs heterojunction significantly enhances charge carrier separation and surface adsorption.
This design offers a viable pathway for developing low-power, high-performance gas sensors.
The developed sensor demonstrates potential for advanced NO2 monitoring applications.