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Fabrication of Carbon Nanotube High-Frequency Nanoelectronic Biosensor for Sensing in High Ionic Strength Solutions
Published on: July 22, 2013
An electrothermal carbon nanotube gas sensor
Takeshi Kawano1, Heather C Chiamori, Marcel Suter
1Berkeley Sensor and Actuator Center, Department of Mechanical Engineering, University of California at Berkeley, CA 94720, USA.
Nano Letters
|November 16, 2007
Summary
This study demonstrates multiwalled carbon nanotube (MWCNT) sensors that detect gas pressure and species using an electrothermal effect. The sensors offer compact, fast, and reversible responses, integrating with microelectronics.
Area of Science:
- Materials Science
- Nanotechnology
- Chemical Sensing
Background:
- The electrothermal effect in materials offers potential for novel sensing applications.
- Multiwalled carbon nanotubes (MWCNTs) possess unique electrical and thermal properties suitable for sensor development.
Purpose of the Study:
- To investigate the gas pressure and species sensing capabilities of MWCNTs utilizing their electrothermal effect.
- To develop a rapid and efficient method for fabricating suspended MWCNT sensors.
Main Methods:
- Fabrication of suspended MWCNTs using localized chemical vapor deposition with real-time electrical feedback control.
- Exposure of heated MWCNTs to various gaseous environments to observe resistance changes.
- Analysis of sensor response to vacuum pressure and different gas species.
Main Results:
- MWCNT resistance changes were observed due to conductive heat-transfer variations caused by gas molecules.
- The sensors demonstrated sensitivity to vacuum pressure.
- Differentiability of various gas species was achieved.
- The developed sensors exhibited compact size, fast response times, and reversibility.
Conclusions:
- Suspended MWCNT electrothermal sensors are effective for both gas pressure and species detection.
- The fabrication method allows for rapid sensor construction.
- These sensors are highly integrable with existing microelectronic systems.
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