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Highly Sensitive Hot-Wire Anemometry Based on Macro-Sized Double-Walled Carbon Nanotube Strands
Dingqu Wang1,2,3, Wei Xiong4, Zhaoying Zhou5
1Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, China. wangdq@tsinghua.edu.cn.
Sensors (Basel, Switzerland)
|August 2, 2017
Summary
This study introduces a novel flow-rate sensor utilizing carbon nanotubes (CNTs) as sensitive elements. The developed CNT-based sensor demonstrates superior sensitivity compared to traditional platinum-coated sensors, operating efficiently at low power.
Area of Science:
- Materials Science
- Nanotechnology
- Sensor Technology
Background:
- Traditional flow-rate sensors often face limitations in sensitivity and power consumption.
- Carbon nanotubes (CNTs) offer unique electrical and thermal properties suitable for advanced sensor applications.
Purpose of the Study:
- To develop and characterize a highly sensitive flow-rate sensor using double-walled carbon nanotubes (DWCNTs).
- To investigate the relationship between sensor surface area ratio and sensitivity.
- To compare the performance of the CNT-based sensor with existing technologies.
Main Methods:
- Fabrication of a flow sensor by suspending DWCNT strands on tungsten prongs.
- Utilizing the self-heating effect of DWCNTs under constant current for flow detection.
- Theoretical analysis of sensor sensitivity based on surface area ratio.
- Experimental validation of flow-rate sensing capabilities.
Main Results:
- The DWCNT exhibits a high positive temperature coefficient of resistance (TCR) of 1980 ppm/K.
- The sensor demonstrates a clear response to fluid flow rate with minimal power consumption (milliwatts).
- The CNT-based flow sensor shows significantly higher sensitivity than a platinum-coated DWCNT sensor.
Conclusions:
- The developed DWCNT flow sensor is a promising technology for sensitive and low-power fluid velocity measurement.
- Sensor sensitivity is positively correlated with its surface area ratio.
- CNT-based sensors offer a viable and improved alternative to conventional flow-sensing devices.
