Biofunctional Electrolyte‐Gated Organic Field‐Effect Transistors

Buth, Felix; Donner, A.; Sachsenhauser, Matthias; Stutzmann, M.; Garrido, José Antonio

doi:10.1002/adma.201201841

Cited by 96 publications

(105 citation statements)

References 38 publications

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“…We therefore tested both types of ZnO films in TFTs gated by phosphate-buffered saline (PBS) as an aqueous gate medium. PBS is often used to simulate bodily fluids [2][3][4] and is thus a realistic medium for biosensor applications.…”

Section: Resultsmentioning

confidence: 99%

“…TFT devices gated by a biologically realistic aqueous electrolyte, phosphate-buffered saline (PBS) solution, were sensitised (e.g. by enzymes) either at the semiconductor/water interface [2,3], or at the gate electrode [4]. The latter is easier and more versatile as it requires no chemical modification of the semiconductor, which can lead to loss of performance.…”

Section: Introductionmentioning

confidence: 99%

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Precursor-route ZnO films from a mixed casting solvent for high performance aqueous electrolyte-gated transistors

Althagafi

Algarni

Naim

et al. 2015

Phys. Chem. Chem. Phys.

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eprints@whiterose.ac.uk https://eprints.whiterose.ac.uk/ Reuse Unless indicated otherwise, fulltext items are protected by copyright with all rights reserved. The copyright exception in section 29 of the Copyright, Designs and Patents Act 1988 allows the making of a single copy solely for the purpose of non-commercial research or private study within the limits of fair dealing. The publisher or other rights-holder may allow further reproduction and re-use of this version -refer to the White Rose Research Online record for this item. Where records identify the publisher as the copyright holder, users can verify any specific terms of use on the publisher's website. TakedownIf you consider content in White Rose Research Online to be in breach of UK law, please notify us by emailing eprints@whiterose.ac.uk including the URL of the record and the reason for the withdrawal request. This is an Accepted Manuscript, which has been through the Royal Society of Chemistry peer review process and has been accepted for publication.Accepted Manuscripts are published online shortly after acceptance, before technical editing, formatting and proof reading. Using this free service, authors can make their results available to the community, in citable form, before we publish the edited article. We will replace this Accepted Manuscript with the edited and formatted Advance Article as soon as it is available. AbstractWe significantly improved the performance of precursor-route semiconducting zinc oxide (ZnO) films in electrolyte-gated thin film transistors (TFTs). We find that the organic precursor to ZnO, Zinc Acetate (ZnAc), dissolves more readily in a 1:1 mix of ethanol (EtOH) and acetone than in either pure EtOH, pure acetone, or pure isopropanol. XPS and SEM characterisation show improved morphology of ZnO films converted from mixed solvent cast ZnAc precursor compared to EtOH cast precursor. When gated with a biocompatible electrolyte, phosphate buffered saline (PBS), ZnO thin film transistors (TFTs) derived from mixed solvent cast ZnAc give 4 times larger field effect current than similar films derived from ZnAc cast from pure EtOH. Sheet resistance at V G = V D = 1V is 30 kΩ/!, lower than for any organic TFT, and lower than for any electrolyte-gated ZnO TFT reported to date.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Precursor-route ZnO films from a mixed casting solvent for high performance aqueous electrolyte-gated transistors

Althagafi

Algarni

Naim

et al. 2015

Phys. Chem. Chem. Phys.

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“…Presently, there is a tremendous activity to explore organic semiconducting materials because they can be processed from solution at low temperature [1][2][3][4][5][6][7][8] hence, traditional printing technologies can be adapted to manufacture printed sensors and detectors. Such types of devices represent an important corner stone for applications such as distributed monitoring and medical surveillance.…”

Section: Introductionmentioning

confidence: 99%

On the mode of operation in electrolyte-gated thin film transistors based on different substituted polythiophenes

Toss¹,

Suspène²,

Piro³

et al. 2014

Organic Electronics

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Organic Thin Film Transistors (OTFT), gated through an aqueous electrolyte, have extensively been studied as sensors in various applications. These water-gated devices are known to work both as electrochemical (Organic ElectroChemical Transistor - OECT) and field-effect (Organic Field-Effect Transistor - OFET) devices. To properly model and predict the response of water-gated OTFT sensors it is important to distinguish between the mechanism, field-effect or electrochemical, by which the transistor is modulated and thus how the gate signal can be affected by the analyte. In this present study we explore three organic polymer semiconductors, poly-(3-hexyl-thiophene) (P3HT), poly-(3-carboxypentyl-thiphene) (P3CPT) and a co-polymer P3HT-co-poly-(3-ethoxypentanoic acid-thiophene) (monomer ratio 1:6, P3HT-COOH15) in water-gated OTFT structures. We report a set of transistor characteristics, including standard output parameters, impedance spectroscopy and current transients, to investigate the origin of the mode of operation in these water-gated OTFTs. Impedance characteristics, including both frequency and voltage dependence, were recorded for capacitor stacks corresponding to the gate/electrolyte/semiconductor/source structure. It is shown that P3HT as well as P3HT-COOH15 both can function as semiconductors in water gated OTFT devices operating in field-effect mode. P3CPT on the other hand shows typical signs of electrochemical mode of operation. The -COOH side group has been suggested as a possible anchoring site for biorecognition elements in EGOFET sensors, rendering P3HT-COOH15 a possible candidate for such applications.

Funding Agencies|European Union [248728]; Swedish Government (SFO-AFM); Onnersjo Foundation (Holmen); Knut and Alice Wallenberg Foundation (Power Papers); VINNOVA (PEA)

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“…Stille coupling is catalysed by the organometallic Pd(0) complex tris(dibenzylideneacetone)dipalladium(0), Pd 2 (dba) 3 [6]. Sensitisers used in PVC membranes typically also are organic metal-complexing agents at low concentration [12,13], including the membrane used by List-Kratochvil et al [5] which is described in [14].…”

Section: Discussionmentioning

confidence: 99%

“…Since then a number of water-gated organic TFTs (OTFTs) have been demonstrated that respond selectively to water-borne analytes due to specific sensitisers that were introduced into the transistor architecture [2,3]. This provides an alternative to the traditional ion-sensitive field between semiconductor and water-borne analyte [4] Of particular interest to the present work is the report by List-Kratochvil et al on a water-gated transistor that is sensitised for the selective detection of Na + ions with an ion-selective PVC membrane [5].…”

Section: Introductionmentioning

confidence: 99%