Electrolytic Gated Organic Field-Effect Transistors for Application in Biosensors—A Review

Wang, Denjung; Noël, Vincent; Piro, Benoı̂t

doi:10.3390/electronics5010009

Cited by 121 publications

(110 citation statements)

References 106 publications

(149 reference statements)

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“…The operational mechanism of these devices shares the same features widely studied in ions sensitive field-effect transistors23. In particular, the two electrical double layers (EDLs) established at both gate electrode/water and water/OSC interfaces are responsible for the electrical tuning of EGOFETs14. Since the aqueous media acts as the effective gate dielectric, a drastic lowering of the operational voltages is intrinsically guaranteed, because the usual EDL capacitance spans from few up to hundreds of μF/cm 2 compared to nF/cm 2 of standard dielectrics5.…”

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confidence: 75%

“…One direct consequence was the extensive exploitation of surface treatments on both gate electrode and OSC, which directly affects the overall performance. Due to such interface sensitivity and water compatibility, EGOFETs can be turned into (bio)-transducers46. Accordingly, it has been possible to monitor different biological events such as host-guest recognition78, DNA hybridization9, or electro-catalysis of metabolites10, whose natural environment is the aqueous media.…”

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confidence: 99%

“…To date, there are no precedents of EGOFETs that meet all these criteria. Undoubtedly, the choice of the OSC and its consequent processing are pivotal4. A high degree of crystallinity along with an extended homogeneity at long-range length scales ( i.e.…”

mentioning

confidence: 99%

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High performing solution-coated electrolyte-gated organic field-effect transistors for aqueous media operation

Zhang

Leonardi

Casalini

et al. 2016

Sci Rep

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Since the first demonstration, the electrolyte-gated organic field-effect transistors (EGOFETs) have immediately gained much attention for the development of cutting-edge technology and they are expected to have a strong impact in the field of (bio-)sensors. However EGOFETs directly expose their active material towards the aqueous media, hence a limited library of organic semiconductors is actually suitable. By using two mostly unexplored strategies in EGOFETs such as blended materials together with a printing technique, we have successfully widened this library. Our benchmarks were 6,13-bis(triisopropylsilylethynyl)pentacene and 2,8-difluoro-5,11-bis(triethylsilylethynyl) anthradithiophene (diF-TES-ADT), which have been firstly blended with polystyrene and secondly deposited by means of the bar-assisted meniscus shearing (BAMS) technique. Our approach yielded thin films (i.e. no thicker than 30 nm) suitable for organic electronics and stable in liquid environment. Up to date, these EGOFETs show unprecedented performances. Furthermore, an extremely harsh environment, like NaCl 1M, has been used in order to test the limit of operability of these electronic devices. Albeit an electrical worsening is observed, our devices can operate under different electrical stresses within the time frame of hours up to a week. In conclusion, our approach turns out to be a powerful tool for the EGOFET manufacturing.

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confidence: 75%

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confidence: 99%

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High performing solution-coated electrolyte-gated organic field-effect transistors for aqueous media operation

Zhang

Leonardi

Casalini

et al. 2016

Sci Rep

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“…However, in an OECT, the on/off switch is produced by ions transfer from the electrolyte and the semiconductor (doping/de-doping) [136], whereas only capacitive processes occur for EGOFETs, without charge transfer [137]. Consequently, EGOFETs are intrinsically faster and more stable than OECTs [134], hence they can be successfully employed as sensors for different kind of analytes (for a review see [137]). …”

Section: Organic Field-effect Transistorsmentioning

confidence: 99%

Flexible and Organic Neural Interfaces: A Review

Lago

Cester

2017

Applied Sciences

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Featured Application: Authors are encouraged to provide a concise description of the specific application or a potential application of the work. This section is not mandatory.Abstract: Neural interfaces are a fundamental tool to interact with neurons and to study neural networks by transducing cellular signals into electronics signals and vice versa. State-of-the-art technologies allow both in vivo and in vitro recording of neural activity. However, they are mainly made of stiff inorganic materials that can limit the long-term stability of the implant due to infection and/or glial scars formation. In the last decade, organic electronics is digging its way in the field of bioelectronics and researchers started to develop neural interfaces based on organic semiconductors, creating more flexible and conformable neural interfaces that can be intrinsically biocompatible. In this manuscript, we are going to review the latest achievements in flexible and organic neural interfaces for the recording of neuronal activity.

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“…In many cases FET devices are considered as effective sensing platforms for heavy metals [30–31]. The main drawback of the FET-based sensors is the complex fabrication, followed by a necessity to grow the layers of high- k gate dielectrics.…”

Section: Introductionmentioning

confidence: 99%

Monolayer graphene/SiC Schottky barrier diodes with improved barrier height uniformity as a sensing platform for the detection of heavy metals

Shtepliuk¹,

Eriksson²,

Khranovskyy³

et al. 2016

Beilstein J. Nanotechnol.

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A vertical diode structure comprising homogeneous monolayer epitaxial graphene on silicon carbide is fabricated by thermal decomposition of a Si-face 4H-SiC wafer in argon atmosphere. Current–voltage characteristics of the graphene/SiC Schottky junction were analyzed by applying the thermionic-emission theory. Extracted values of the Schottky barrier height and the ideality factor are found to be 0.4879 ± 0.013 eV and 1.01803 ± 0.0049, respectively. Deviations of these parameters from average values are smaller than those of previously observed literature data, thereby implying uniformity of the Schottky barrier height over the whole diode area, a stable rectifying behaviour and a good quality of ohmic palladium–graphene contacts. Keeping in mind the strong sensitivity of graphene to analytes we propose the possibility to use the graphene/SiC Schottky diode as a sensing platform for the recognition of toxic heavy metals. Using density functional theory (DFT) calculations we gain insight into the nature of the interaction of cadmium, mercury and lead with graphene as well as estimate the work function and the Schottky barrier height of the graphene/SiC structure before and after applying heavy metals to the sensing material. A shift of the I–V characteristics of the graphene/SiC-based sensor has been proposed as an indicator of presence of the heavy metals. Since the calculations suggested the strongest charge transfer between Pb and graphene, the proposed sensing platform was characterized by good selectivity towards lead atoms and slight interferences from cadmium and mercury. The dependence of the sensitivity parameters on the concentration of Cd, Hg and Pb is studied and discussed.

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Electrolytic Gated Organic Field-Effect Transistors for Application in Biosensors—A Review

Cited by 121 publications

References 106 publications

High performing solution-coated electrolyte-gated organic field-effect transistors for aqueous media operation

High performing solution-coated electrolyte-gated organic field-effect transistors for aqueous media operation

Flexible and Organic Neural Interfaces: A Review

Monolayer graphene/SiC Schottky barrier diodes with improved barrier height uniformity as a sensing platform for the detection of heavy metals

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