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Suspended GaN nanowires as NO2 sensor for high temperature applications
Jaesam Sim1, Kwanoh Kim, Soonho Song
1School of Mechanical Engineering, Yonsei University, 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, Republic of Korea.
The Analyst
|March 7, 2013
Summary
This study presents a novel gas sensor using suspended Gallium Nitride (GaN) nanowires for detecting nitrogen dioxide (NO2) at high temperatures. The sensor demonstrates stable and enhanced responsiveness, making it suitable for wide-ranging applications.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Sensing
Background:
- Gas sensors are crucial for environmental monitoring and industrial safety.
- Existing sensors often face limitations in operating temperature range and responsiveness.
- Gallium Nitride (GaN) nanowires offer potential for high-temperature applications due to their thermal stability.
Purpose of the Study:
- To develop a gas sensor with a wide operating temperature range.
- To enhance sensor responsiveness using functionalized suspended nanowires.
- To investigate the sensor's performance for detecting nitrogen dioxide (NO2) at elevated temperatures.
Main Methods:
- Batch fabrication of suspended Gallium Nitride (GaN) nanowires on silicon microelectrodes.
- Functionalization of GaN nanowires with Platinum-Palladium (Pt-Pd).
- Testing sensor response to NO2, NH3, and CO2 at temperatures up to 350 °C.
Main Results:
- The sensor operates effectively up to 350 °C without performance degradation.
- A linear increase in relative response to NO2 (100-1000 ppm) was observed at 350 °C.
- The sensor showed a two- to four-fold higher responsiveness to NO2 compared to NH3 and CO2.
Conclusions:
- Suspended, functionalized GaN nanowires enable high-temperature gas sensing with enhanced responsiveness.
- The sensor's design, with increased surface area and substrate isolation, contributes to improved performance.
- This technology holds promise for reliable gas detection in demanding environments.
