Cart (Loading....) | Create Account
Close category search window
 

Improving Carbon Nanotubes Sensor Time Response and Responsivity Using Constant-Power Activation

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

4 Author(s)
Mengxing Ouyang ; Centre for Micro & Nano Syst., Chinese Univ. of Hong Kong, Shatin, China ; Li, W.J. ; Leong, P.H.W. ; Ka Wai Wong

For classical resistive-based signal transduction methods, constant-power (CP) and constant-current (CC) activation methods have been utilized since the 1970s. However, since the discovery of carbon nanotube (CNT) in 1991, not much has been done in the past 20 years in terms of comparing how these transduction methods affect CNT-based sensor output. In this paper, we compare the responsivity, sensitivity, transient response, and instantaneous power consumption of CNT sensors activated by CC and CP modes. As an application example, multiwall CNTs were functionalized with COOH groups and used as ethanol (alcohol) vapor sensors. A CP control circuit has been built in order to test the CNT-based ethanol vapor sensors. A commercial source meter was used to activate the CNT sensors under CC mode. The CP configuration was shown to be effective in minimizing the self-heating effect, which is a significant factor that affects sensor performance, especially for resistive-based sensors. Compared to CC mode, CP mode of sensor activation demonstrated not only shorter transient response time but also larger responsivity, especially when the input activation power is low or ethanol concentration is relatively high.

Published in:

Nanotechnology, IEEE Transactions on  (Volume:11 ,  Issue: 3 )

Date of Publication:

May 2012

Need Help?


IEEE Advancing Technology for Humanity About IEEE Xplore | Contact | Help | Terms of Use | Nondiscrimination Policy | Site Map | Privacy & Opting Out of Cookies

A not-for-profit organization, IEEE is the world's largest professional association for the advancement of technology.
© Copyright 2014 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.