Stomata-Inspired Photomechanical Ion Nanochannels Modified by Azobenzene Composites
- Authors
- Chun, Kyoung-Yong; Son, Young Jun; Jo, Sunghwan; Han, Chang-Soo
- Issue Date
- 26-4월-2018
- Publisher
- WILEY-V C H VERLAG GMBH
- Keywords
- azobenzene; ion channels; photomechanical sensors; pore actuation; stomata
- Citation
- SMALL, v.14, no.17
- Indexed
- SCIE
SCOPUS
- Journal Title
- SMALL
- Volume
- 14
- Number
- 17
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/76091
- DOI
- 10.1002/smll.201703618
- ISSN
- 1613-6810
- Abstract
- A low-powered and highly selective photomechanical sensor system mimicking stomata in the epidermis of leaves harvested from nature is demonstrated. This device uses a light-responsive composite consisting of 4-amino-1,1-azobenzene-3,4-disulfonic acid monosodium salt (AZO) and poly(diallyldimethylammonium chloride) (PDDA) coated on a membrane with tens of nanometer-size pores. The ionic current change through the pore channels as a function of pore size variation is then measured. The tran-cis isomerism of AZO-PDDA during light irradiation and the operation mechanism of photomechanical ion channel sensor are discussed and analyzed using UV-vis spectroscopy and atomic force microscopy analysis. It presents the discriminative current levels to the different light wavelengths. The response time of the photoreceptor is about 0.2 s and it consumes very low operating power (approximate to 15 nW) at 0.1 V bias. In addition, it is found that the change of the pore diameter during the light irradiation is due to the photomechanical effect, which is capable of distinguishing light intensity and wavelength.
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Collections - College of Engineering > Department of Mechanical Engineering > 1. Journal Articles
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