Next Article in Journal
Evaluation of Performance and Uncertainty of Infrared Tympanic Thermometers
Previous Article in Journal
Data Centric Storage Technologies: Analysis and Enhancement
Article Menu

Export Article

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

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

Micro Systems Technology Center, ITRI South, Industrial Technology Research Institute, Tainan 709, Taiwan
College of Dental Medicine, Kaohsiung Medical University, Kaohsiung 807, Taiwan
Chemical Engineering Department, National Chung-Cheng University, Chia-Yi, 621, Taiwan
Department of Electronic Engineering National University of Tainan, Tainan, 700, Taiwan
National Nano Device Laboratories, Tainan 741, Taiwan
Authors to whom correspondence should be addressed.
Received: 15 March 2010 / Revised: 23 March 2010 / Accepted: 24 March 2010 / Published: 30 March 2010
(This article belongs to the Section Chemical Sensors)
View Full-Text   |   Download PDF [698 KB, uploaded 21 June 2014]   |  


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. View Full-Text
Keywords: ZnGa2O4; ZnO; core shell; nanowire; NO2; gas sensor; sensitivity ZnGa2O4; ZnO; core shell; nanowire; NO2; gas sensor; sensitivity

This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & 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.

Show more citation formats Show less citations formats

Related Articles

Article Metrics

Article Access Statistics



[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top