Enhanced performance in capacitive sensors using carbon nanotube/polydimethylsiloxane nanocomposites with high dielectric properties

Title
Enhanced performance in capacitive sensors using carbon nanotube/polydimethylsiloxane nanocomposites with high dielectric properties
Authors
이상수김희숙최재유장혜영윤형석고영표전인수김종호
Issue Date
2016-03
Publisher
Nanoscale
Citation
VOL 8, 5667-5675
Abstract
Force sensors have attracted tremendous attention owing to their applications in various fields such as touch screens, robots, smart scales, and wearable devices. The force sensors reported so far have been mainly focused on high sensitivity based on delicate microstructured materials, resulting in low reproducibility and high fabrication cost that are limitations for wide applications. As an alternative, we demonstrate a novel capacitive-type force sensor with enhanced performance owing to the increased dielectric properties of elastomers and simple sensor structure. We rationally design dielectric elastomers based on alkylamine modified-multi-walled carbon nanotube (MWCNT)/polydimethylsiloxane (PDMS) composites, which have a higher dielectric constant than pure PDMS. The alkylamine-MWCNTs show excellent dispersion in a PDMS matrix, thus leading to enhanced and reliable dielectric properties of the composites. A force sensor array fabricated with alkylamine-MWCNT/PDMS composites presents an enhanced response due to the higher dielectric constant of the composites than that of pure PDMS. This study is the first to report enhanced performance of capacitive force sensors by modulating the dielectric properties of elastomers. We believe that the disclosed strategy to improve the sensor performance by increasing the dielectric properties of elastomers has great potential in the development of capacitive force sensor arrays that respond to various input forces.
URI
http://pubs.kist.re.kr/handle/201004/59129
ISSN
20403364
Appears in Collections:
KIST Publication > Article
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