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Chemiresistors for the Real-Time Wireless Detection of Anions

Title
Chemiresistors for the Real-Time Wireless Detection of Anions
Author
최선진
Keywords
anion sensing; deprotonation; hydrogen bonding; single-walled carbon nanotubes; squaramide
Issue Date
2019-11
Publisher
WILEY-V C H VERLAG GMBH
Citation
ADVANCED FUNCTIONAL MATERIALS, v. 30, no. 7, article no. 1907087
Abstract
Reported is an electrical transduction platform for real-time wireless anion sensing using single-walled carbon nanotubes (SWCNTs) noncovalently functionalized with squaramide-based anion binding selectors. Systematically studied are anion-binding properties and efficiency of the electrical transduction of the functionalized SWCNT composites using the squaramide-based selectors with two similar electron-withdrawing groups, 3,5-bis(trifluoromethyl)benzyl (1) and 3,5-bis(trifluoromethyl)phenyl (2), which induce hydrogen-bonding interaction with anions and deprotonation of a squaramide N-H proton upon addition of acetate (AcO-), respectively. Charge transduction occurs with AcO- as a result of charge transfer from the deprotonated selector 2, whereas less sensitive transduction is observed with selector 1 via hydrogen-bonding interaction. These results provide guidelines to efficiently transduce the chemical interaction between selectors and anions to create resistive transduction with functionalized SWCNTs. Electron-withdrawing groups adjacent to the squaramide as well as proximate cationic pyridyl groups, enhance the anion binding affinity and also lower the selector's pK(a). The chemiresistive sensor arrays are readily integrated with a wireless sensing module and demonstrated real-time sensing of multiple anions with a smartphone readout.
URI
https://onlinelibrary.wiley.com/doi/full/10.1002/adfm.201907087https://repository.hanyang.ac.kr/handle/20.500.11754/155126
ISSN
1616-301X; 1616-3028
DOI
10.1002/adfm.201907087
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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