Organic Transistor Based on Cyclopentadithiophene-Benzothiadiazole Donor-Acceptor Copolymer for the Detection and Discrimination between Multiple Structural Isomers

M Khatib, Tan Phat Huynh, JJ Sun, Do TT, P Sonar, F Hinkel, K Müllen, H Haick

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Distinguishing structural isomers is a critical and challenging task for biotechnology, chemical industry, and environmental monitoring. Approaches currently available are limited in terms of selectivity and simplicity. In this paper, a highly sensitive organic field-effect transistor (OFET) using the cyclopentadithiophene-benzothiadiazole (CDT-BTZ) copolymers as a semiconductor is presented for easy and selective detection of different families of structural isomers, as well as between different isomers within each family. High accuracy discrimination is achieved over a range of concentrations using only a single sensing parameter derived from the OFET characteristic transfer curve. As a reference, other homopolymer- and donor-acceptor copolymer-based OFET sensors are examined but do not have an equivalent sensing performance to that of the CDT-BTZ-based OFETs. Investigating the link between isomer absorption and swelling, supramolecular order and energy levels of the active layer reveals a unique effect of each isomer on the energy bands of the semiconducting polymer.
Original languageUndefined/Unknown
Pages (from-to)
Number of pages8
JournalAdvanced Functional Materials
Issue number9
Publication statusPublished - 2019
MoE publication typeA1 Journal article-refereed


  • donor-acceptor copolymers
  • isomers
  • xylenes
  • organic field-effect transistor

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