Organic-based field effect transistors for protein detection fabricated by inkjet-printing

• Published in: Organic electronics Vol. 84; p. 105794
• Main Authors: Martínez-Domingo, Carme, Conti, Silvia, de la Escosura-Muñiz, Alfredo, Terés, Lluís, Merkoçi, Arben, Ramon, Eloi
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01-09-2020
• Subjects: Inkjet-printing; Organic electronics; Surface functionalization; Thin-film transistor; Surface functionalization; Inkjet-printing; Thin-film transistor; Organic electronics
• ISSN: 1566-1199; 1878-5530
• DOI: 10.1016/j.orgel.2020.105794

Biosensors based on Organic Field-Effect Transistors (OFETs) have attracted increasing attention due to the possibility of rapid, label-free, and inexpensive detection. Among all the different possibilities, inkjet-printed top-gate organic Field Effect Transistors-Based Biosensors (BioFETs) using a polymeric gate insulator have been seldom reported. In this work, a systematic investigation in terms of topographical and electrical characterization was carried out in order to find the optimal fabrication process for obtaining a reliable polymer insulator. Previous studies have demonstrated that the best electrical performance arises from the use of the perfluoropolymer Cytop™[12,13,14]. Consequently, a simple immobilization protocol was used to ensure the proper attachment of a model biomolecule onto the Cytop's hydrophobic surface whilst keeping its remarkable insulating properties with gate current in the range of dozens of pico-amperes. The top-gate inkjet-printed BioFETs presented in this study operate at threshold voltages in the range of 1–2 V and show durability even when exposed to oxygen plasma, wet amine functionalization treatments, and aqueous media. As a preliminary application, the inkjet-printed top-gate BioFETs is used for monitoring an immunoreaction by measuring changes in the drain current, paving the way for further use of this device in the immunosensing field.
A systematic study and optimization of a simple functionalization procedure to attach antibodies onto Cytop film for obtaining inkjet printed top-gate BioFETs is presented. [Display omitted]
•· The proposed inkjet-printed organic transistor-based flexible sensor delivers a label-free response for immunosensing applications.•It is shown that the use of the perfluoropolymer Cytop as gate insulator presents the best electrical performance in terms of leakage current.•A functionalization procedure is presented to attach biomolecules onto the Cytop surface while keeping its remarkable insulating properties.•The BioFET has been evaluated as a proof-of-concept sensor to detect a model biomolecule through drain current changes.