Liquid Crystal-on-Organic Field-Effect Transistor Sensory Devices for Perceptive Sensing of Ultralow Intensity Gas Flow Touch

We demonstrate liquid crystal-on-organic field-effect transistor (LC-on-OFET) sensory devices that can perceptively sense ultralow level gas flows. The LC-on-OFET devices were fabricated by mounting LC molecules (4-cyano-4′-pentylbiphenyl – 5CB) on the polymer channel layer of OFET. Results showed t...

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Bibliographic Details
Published in:Scientific reports 2013-08, Vol.3 (1), p.2452-2452, Article 2452
Main Authors: Seo, Jooyeok, Park, Soohyeong, Nam, Sungho, Kim, Hwajeong, Kim, Youngkyoo
Format: Article
Language:English
Subjects:
639/301/923/919
639/766/1130/2798
639/766/25
639/925/927/998
Equipment Design
Equipment Failure Analysis
Gases - analysis
Humanities and Social Sciences
Liquid Crystals - chemistry
multidisciplinary
Nitrogen
Polymers
Rheology - instrumentation
Science
Skin
Touch
Transducers, Pressure
Transistors
Transistors, Electronic
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Summary:We demonstrate liquid crystal-on-organic field-effect transistor (LC-on-OFET) sensory devices that can perceptively sense ultralow level gas flows. The LC-on-OFET devices were fabricated by mounting LC molecules (4-cyano-4′-pentylbiphenyl – 5CB) on the polymer channel layer of OFET. Results showed that the presence of LC molecules on the channel layer resulted in enhanced drain currents due to a strong dipole effect of LC molecules. Upon applying low intensity nitrogen gas flows, the drain current was sensitively increased depending on the intensity and time of nitrogen flows. The present LC-on-OFET devices could detect extremely low level nitrogen flows (0.7 sccm–11 μl/s), which could not be felt by human skins, thanks to a synergy effect between collective behavior of LC molecules and charge-sensitive channel layer of OFET. The similar sensation was also achieved using the LC-on-OFET devices with a polymer film skin, suggesting viable practical applications of the present LC-on-OFET sensory devices.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep02452