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Issue 13, 2019, Issue in Progress
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A highly porous and conductive composite gate electrode for OTFT sensors

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Abstract

Ionic/protonic to electronic transducers based on organic thin film transistors have shown great promise for applications in bioelectronic interface devices and biosensors, and development of materials that exhibit mixed ionic/electronic conduction are an essential part of these devices. In this work, we investigated the proton sensing properties of an all solid-state and low voltage operating organic thin film transistor (OTFT) that uses the organic mixed conductor poly(3,4-ethylenedioxythiophene) doped with poly(styrene sulfonate) (PEDOT:PSS) as the gate electrode. To address the limited sensitivity due to the lack of porosity in PEDOT:PSS base sensors, we proposed a composite gate electrode material composed of PEDOT:PSS and proton conducting mesoporous SO3H-Si-MCM-41 nanoparticles for improved proton sensitivity. The composite gate electrode doubles the proton sensitivity of the OTFT, indicating a clear advantage of adding SO3H-Si-MCM-41 in the PEDOT:PSS gate. Moreover, the OTFTs with the composite gate electrode maintained OTFT characteristics similar to that of the PEDOT:PSS gated OTFT. A detailed and systematic study of the effect of variation in the composition of PEDOT:PSS:SO3H-Si-MCM-41 on OTFT characteristics and sensing properties is carried out. Our results open up the possibility of combining inorganic nanomaterials with organic conductors in the development of highly efficient bioelectronic sensing platforms.

Graphical abstract: A highly porous and conductive composite gate electrode for OTFT sensors

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Publication details

The article was received on 08 Jan 2019, accepted on 19 Feb 2019 and first published on 04 Mar 2019


Article type: Paper
DOI: 10.1039/C9RA00148D
RSC Adv., 2019,9, 7278-7284
  • Open access: Creative Commons BY license
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    A highly porous and conductive composite gate electrode for OTFT sensors

    S. D. Yambem, S. Burns, Joshua N. Arthur, J. Timm, M. A. Woodruff, A. K. Pandey and R. Marschall, RSC Adv., 2019, 9, 7278
    DOI: 10.1039/C9RA00148D

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