Journal
CHEMISTRY OF MATERIALS
Volume 35, Issue 21, Pages 9257-9263Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.chemmater.3c02034
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A robust electrolyte-gated organic field-effect transistor (EGOFET) that can respond to pH in the range of 1-10 is reported. The sensor uses the pH-dependent supramolecular host-guest complexation of imidazole/beta-cyclodextrin to achieve response to different pH substances.
A robust electrolyte-gated organic field-effect transistor (EGOFET) able to respond to pH in the range 1-10 is reported. This is realized by exploiting the pH-dependent supramolecular host-guest complexation of imidazole/beta-cyclodextrin (beta-CD). The sensing protocol is performed by incubating magnetic nanoparticles functionalized with beta-CD with imidazole solutions at different pHs and trapping them in a magnetic carbon electrode. Such an electrode is then implemented as gate contact in the EGOFET. At higher pH, the complexation is more favored, resulting in a negative shift of the device transfer characteristics. Remarkably, the carbon gate electrode can be polished and reused and the devices show high stability and reproducibility.
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