Enhanced superoxide sensitivity in organic field-effect transistor sensors by introducing nanoclay-polyphenol-polymer hybrid sensing channels

Chulyeon Lee; Jaehoon Jeong; Hwajeong Kim; Youngkyoo Kim

doi:10.1016/j.jhazmat.2019.04.013

Enhanced superoxide sensitivity in organic field-effect transistor sensors by introducing nanoclay-polyphenol-polymer hybrid sensing channels

J Hazard Mater. 2019 Jul 15:374:159-166. doi: 10.1016/j.jhazmat.2019.04.013. Epub 2019 Apr 2.

Authors

Chulyeon Lee¹, Jaehoon Jeong¹, Hwajeong Kim², Youngkyoo Kim³

Affiliations

¹ Organic Nanoelectronics Laboratory and KNU Institute for Nanophotonics Applications (KINPA), Department of Chemical Engineering, School of Applied Chemical Engineering, Kyungpook National University, Daegu, 41566, Republic of Korea.
² Organic Nanoelectronics Laboratory and KNU Institute for Nanophotonics Applications (KINPA), Department of Chemical Engineering, School of Applied Chemical Engineering, Kyungpook National University, Daegu, 41566, Republic of Korea; Research Institute of Environmental Science & Technology, Kyungpook National University, Daegu, 41566, Republic of Korea. Electronic address: khj217@knu.ac.kr.
³ Organic Nanoelectronics Laboratory and KNU Institute for Nanophotonics Applications (KINPA), Department of Chemical Engineering, School of Applied Chemical Engineering, Kyungpook National University, Daegu, 41566, Republic of Korea. Electronic address: ykimm@knu.ac.kr.

PMID: 30999139
DOI: 10.1016/j.jhazmat.2019.04.013

Abstract

Here we report that nanoclay-polyphenol-polymer hybrid sensing channels can greatly enhance the sensitivity for hazardous reactive oxygen species (ROS) in organic field-effect transistor (OFET) sensors. The hybrid layers were prepared by introducing nanoclay into the binary mixtures of poly(3-hexylthiophene) (P3HT) and rutin (a polyphenol) at various weight ratios. The presence of nanoclay improved the P3HT crystallinity in the hybrid films, which contributed to the increased drain current and well-maintained hole mobility even at the reduced amount of charge-transporting P3HT part. At the best composition (P3HT:rutin:nanocaly = 10:1:2 by weight), the OFETs with the hybrid layers were able to sense even 1 nM superoxide (a ROS) and exhibited pronouncedly enhanced sensitivity compared to those without nanoclay. The morphology investigation disclosed that rutin-nanoclay complexes formed in the hybrid films might be responsible for the enhanced sensitivity, because they let more rutin molecules protrude on the surface of channel layers for reactions with superoxide.

Keywords: Hybrid channel; Nanoclay; OFET; Polyphenol; Reactive oxygen species.

Publication types

Research Support, Non-U.S. Gov't