Synthesis of TiO2 nanowires for rapid NO2 detection

• Published in: Sensors and actuators. A. Physical. 2018-04, Vol.272, p.288-294
• Main Authors: Zhu, Zhen, Lin, Shu-Jing, Wu, Chun-Han, Wu, Ren-Jang
• Format: Article
• Language: English
• Subjects: Gas sensor; Nanowires; Nitrogen dioxide; Titanium dioxide
• ISSN: 0924-4247; 1873-3069
• DOI: 10.1016/j.sna.2018.02.006

A titanium dioxide nanowires (TiO2-NWs) has been successfully fabricated by hydrothermal method. It was found that the sensor based on TiO2-NWs showed excellent stability, selectivity and high response 3.10 towards 100 ppm NO2 concentration at room temperature with rapid response and recovery times of 10 s and 19 s, respectively. [Display omitted] •A novel titanium dioxide nanowire (TiO2-NWs) was prepared for the detection of NO2 gas.•The rapid response and recovery times of 10 s and 19 s–100 ppm NO2 gas, respectively.•The sensor exhibited good selectivity and stability tests. In this study, a highly sensitive nitrogen dioxide (NO2) gas sensor based on titanium dioxide nanowires (TiO2-NWs) was successfully fabricated using a hydrothermal method. The structure of the sensor was investigated using scanning electron microscopy, X-ray diffraction, energy-dispersive X-ray spectroscopy, and transmission electron microscopy. The sensor properties were also investigated. We found that the TiO2-NW sensor showed excellent selectivity and high sensitivity down to 100 ppm NO2 at room temperature with rapid response and recovery times of 10 s and 19 s, respectively. Additionally, the TiO2-NWs displayed good repeatability and selectivity against various interfering gases such as NH3, H2, and CH4. We propose a possible mechanism for NO2 sensing by the TiO2-NW sensor.