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. 2020 Apr 26;20(9):2455. doi: 10.3390/s20092455

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© 2020 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

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(a) Photocurrent responses of 100 μM GSSG, 100 μM glutathione (GSH), and pure PBS in 500 μL. Photocurrent response of biosensors to the following cells in 50 μL; (b) without esophageal cancer cells; (c) esophageal cancer cells (OE21); (d) esophageal cancer cells (OE21-1); (e) Cu₂O 25 min + Cu₂O with HMTA 5 min/PEDOT:PSS/ZnO shows considerable photocurrent response difference between OE21 and OE21-1. Cu₂O with HMTA/PEDOT:PSS/ZnO presents high gain of 5.8 and 6.2 times in the detection of OE21 and OE21-1, respectively.