Controlled covalent functionalization of a graphene-channel of a field effect transistor as an ideal platform for (bio)sensing applications

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Mishyn, Vladyslav | Rodrigues, Teresa | Leroux, Yann R. | Aspermair, Patrik | Happy, Henri | Bintinger, Johannes | Kleber, Christoph | Boukherroub, Rabah | Knoll, Wolfgang | Szunerits, Sabine

Edité par HAL CCSD ; Royal Society of Chemistry

International audience. The controlled covalent functionalization of the graphene channel of a field effect transistor, based on interdigitated gold electrodes (source and drain), via electrochemical grafting, using specifically designed aryl diazonium species is demonstrated to allow the simple fabrication of a general platform for (bio)sensing applications. The electrochemical grafting of a protected ethynylphenyl diazonium salt leads to the deposition of only a monolayer on the graphene channel. This controlled covalent functionalization of the graphene channel results in a charge mobility of the GFET of 1739 ± 376 cm2 V−1 s−1 and 1698 ± 536 cm2 V−1 s−1 for the holes and electrons, respectively, allowing their utilization as (bio)sensors. After deprotection, a dense and compact ethynylphenyl monolayer is obtained and allows the immobilization of a wide range of (bio)molecules by a “click” chemistry coupling reaction (Huisgen 1,3-dipolar cycloaddition). This finding opens promising options for graphene-based (bio)sensing applications.

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