HYDROTHERMAL SYNTHESIS OF POROUS ZnO NANO/MICRORODS FOR HIGHLY SENSITIVE NO2 GAS SENSING

Lưu Hoàng Minh; Phạm Thị Thùy Thu; Phạm Văn Tòng

doi:10.34238/tnu-jst.13189

HYDROTHERMAL SYNTHESIS OF POROUS ZnO NANO/MICRORODS FOR HIGHLY SENSITIVE NO2 GAS SENSING

About this article

Received: 08/07/25 Revised: 21/11/25 Published: 25/11/25

Authors

1. Luu Hoang Minh, Hanoi University of Civil Engineering
2. Pham Thi Thuy Thu, Hanoi University of Civil Engineering
3. Pham Van Tong , Hanoi University of Civil Engineering

Abstract

This study presents a simple, low-cost hydrothermal synthesis method for fabricating porous ZnO nano/microrods without the use of surfactants, combined with a thermal treatment process. The resulting material exhibits a highly porous structure, which significantly increases the specific surface area and enhances effective interactions with gas molecules. When applied in gas sensors, the material demonstrates excellent NO₂ detection capabilities at low concentrations (0.1–2.0 ppm), with a high response and an optimal operating temperature of only 150 °C. The sensor also shows fast response time, stable repeatability, good recovery, and high selectivity toward NO₂ compared to reducing gases and volatile organic compounds such as H₂, CO, NH₃, ethanol, and acetone. These results affirm the potential of porous ZnO nanorods for developing high-performance NO₂ gas sensors, paving the way for practical applications in air quality monitoring.

Keywords

Gas sensor; ZnO; Hydrothermal; NO2; Nano/Microstructures

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DOI: https://doi.org/10.34238/tnu-jst.13189

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