Sensors 2010, 10(4), 3057-3072; doi:10.3390/s100403057
Article

The Assessment for Sensitivity of a NO2 Gas Sensor with ZnGa2O4/ZnO Core-Shell Nanowires—a Novel Approach

1 Micro Systems Technology Center, ITRI South, Industrial Technology Research Institute, Tainan 709, Taiwan 2 College of Dental Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan 3 Chemical Engineering Department, National Chung-Cheng University, Chia-Yi, 621, Taiwan 4 Department of Electronic Engineering National University of Tainan, Tainan, 700, Taiwan 5 National Nano Device Laboratories, Tainan 741, Taiwan
* Authors to whom correspondence should be addressed.
Received: 15 March 2010; in revised form: 23 March 2010 / Accepted: 24 March 2010 / Published: 30 March 2010
(This article belongs to the Section Chemical Sensors)
PDF Full-text Download PDF Full-Text [698 KB, uploaded 30 March 2010 14:33 CEST]
Abstract: The application of novel core-shell nanowires composed of ZnGa2O4/ZnO to improve the sensitivity of NO2 gas sensors is demonstrated in this study. The growth of ZnGa2O4/ZnO core-shell nanowires is performed by reactive evaporation on patterned ZnO:Ga/SiO2/Si templates at 600 °C. This is to form the homogeneous structure of the sensors investigated in this report to assess their sensitivity in terms of NO2 detection. These novel NO2 gas sensors were evaluated at working temperatures of 25 °C and at 250 °C, respectively. The result reveals the ZnGa2O4/ZnO core-shell nanowires present a good linear relationship (R2 > 0.99) between sensitivity and NO2 concentration at both working temperatures. These core-shell nanowire sensors also possess the highest response (<90 s) and recovery (<120 s) values with greater repeatability seen for NO2 sensors at room temperature, unlike traditional sensors that only work effectively at much higher temperatures. The data in this study indicates the newly-developed ZnGa2O4/ZnO core-shell nanowire based sensors are highly promising for industrial applications.
Keywords: ZnGa2O4; ZnO; core shell; nanowire; NO2; gas sensor; sensitivity

Article Statistics

Load and display the download statistics.

Citations to this Article

Cite This Article

MDPI and ACS Style

Chen, I.-C.; Lin, S.-S.; Lin, T.-J.; Hsu, C.-L.; Hsueh, T.J.; Shieh, T.-Y. The Assessment for Sensitivity of a NO2 Gas Sensor with ZnGa2O4/ZnO Core-Shell Nanowires—a Novel Approach. Sensors 2010, 10, 3057-3072.

AMA Style

Chen I-C, Lin S-S, Lin T-J, Hsu C-L, Hsueh TJ, Shieh T-Y. The Assessment for Sensitivity of a NO2 Gas Sensor with ZnGa2O4/ZnO Core-Shell Nanowires—a Novel Approach. Sensors. 2010; 10(4):3057-3072.

Chicago/Turabian Style

Chen, I-Cherng; Lin, Shiu-Shiung; Lin, Tsao-Jen; Hsu, Cheng-Liang; Hsueh, Ting Jen; Shieh, Tien-Yu. 2010. "The Assessment for Sensitivity of a NO2 Gas Sensor with ZnGa2O4/ZnO Core-Shell Nanowires—a Novel Approach." Sensors 10, no. 4: 3057-3072.

Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert