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Paper Abstract and Keywords
Presentation 2017-12-01 14:00
Improvement of hybrid sensing devices with solution-processed carbon nanotube electrodes and the development of their measurement systems
Eiji Itoh (Shinshu Univ.) OME2017-44
Abstract (in Japanese) (See Japanese page) 
(in English) We have developed printed capacitive humidity sensors with highly gas permeable carbon nanotube top electrodes using solution techniques. The hydrophobic, porous multiwalled carbon nanotube (MWCNT) network was suitable for gas permeation, and the response of the capacitive humidity sensors was faster than that of a device with a single-walled carbon nanotube (SWCNT) top electrode. The also newly developed measurement system and it enabled us to vary the ambient relative humidity within 0.03 s. A comparative study of the devices revealed that the rise time (humidification process) of the device with MWCNTs in the transient measurement was shorter than that with SWCNTs owing to the hydrophobic surface of the MWCNTs. A much larger difference was observed during the drying process (recovery time) probably owing to the hydrophilic parts of the SWCNT surface. It was revealed that the response time was almost proportional to the square of the thickness of the polyimide dielectric layer, d, and the sensitivity was inversely proportional to d. The rise time decreased to less than 0.1 s and higher sensitivity was obtained in a device with thin polyimide and MWCNT top electrodes. This value is suitable for use in high-speed humidity sensors to realize a real-time humidity and breath-sensing measurement system.
We also fabricated SWCNT-based stretchable strain sensors (gauge) with 100 um-thick poly(urethane) base films and demonstrated the resistive motion sensors.
Keyword (in Japanese) (See Japanese page) 
(in English) Carbon nanotubes / polyimde / capacitive humidity sensor / poly(urethane) / strain sensor / / /  
Reference Info. IEICE Tech. Rep., vol. 117, no. 334, OME2017-44, pp. 43-47, Dec. 2017.
Paper # OME2017-44 
Date of Issue 2017-11-24 (OME) 
ISSN Print edition: ISSN 0913-5685    Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF OME2017-44

Conference Information
Committee OME  
Conference Date 2017-12-01 - 2017-12-01 
Place (in Japanese) (See Japanese page) 
Place (in English) Sun Messe Tosu 
Topics (in Japanese) (See Japanese page) 
Topics (in English) Organic molecular devices, biotechnology, thin film, novel material, evaluation method, etc 
Paper Information
Registration To OME 
Conference Code 2017-12-OME 
Language Japanese 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Improvement of hybrid sensing devices with solution-processed carbon nanotube electrodes and the development of their measurement systems 
Sub Title (in English)  
Keyword(1) Carbon nanotubes  
Keyword(2) polyimde  
Keyword(3) capacitive humidity sensor  
Keyword(4) poly(urethane)  
Keyword(5) strain sensor  
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1st Author's Name Eiji Itoh  
1st Author's Affiliation Shinshu University (Shinshu Univ.)
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Speaker Author-1 
Date Time 2017-12-01 14:00:00 
Presentation Time 20 minutes 
Registration for OME 
Paper # OME2017-44 
Volume (vol) vol.117 
Number (no) no.334 
Page pp.43-47 
#Pages 5 
Date of Issue 2017-11-24 (OME) 

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