共查询到20条相似文献，搜索用时 15 毫秒
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Erica Zeglio Jens Eriksson Roger Gabrielsson Niclas Solin Olle Inganäs 《Advanced materials (Deerfield Beach, Fla.)》2017,29(19)
Hydrophobic, self‐doped conjugated polyelectrolytes (CPEs) are introduced as highly stable active materials for organic electrochemical transistors (OECTs). The hydrophobicity of CPEs renders films very stable in aqueous solutions. The devices operate at gate voltages around zero and show no signs of degradation when operated for 104 cycles under ambient conditions. These properties make the produced OECTs ideal devices for applications in bioelectronics. 相似文献
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Sanggil Han Anastasios G. Polyravas Shofarul Wustoni Sahika Inal George G. Malliaras 《Advanced Materials Technologies》2021,6(12):2100763
Organic electrochemical transistors (OECTs) are widely used as amplifying transducers of biological signals due to their high transconductance and biocompatibility. For implantable applications that penetrate into tissue, OECTs need to be integrated onto narrow probes. The scarcity of real estate necessitates the use of small local gate electrodes and narrow interconnects. This work shows that both of these factors lead to a decrease in the maximum transconductance and an increase in gate voltage required to attain this maximum. This work further shows that coating the gate electrode with a thick conducting polymer improves performance. These findings help guide the development of efficient OECTs on implantable probes. 相似文献
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Connor G. Bischak Lucas Q. Flagg David S. Ginger 《Advanced materials (Deerfield Beach, Fla.)》2020,32(32):2002610
Conjugated-polymer-based organic electrochemical transistors (OECTs) are being studied for applications ranging from biochemical sensing to neural interfaces. While new polymers that interface digital electronics with the aqueous chemistry of life are being developed, the majority of high-performance organic transistor materials are poor at transporting biologically relevant ions. Here, the operating mode of an organic transistor is changed from that of an electrolyte-gated organic field-effect transistor (EGOFET) to that of an OECT by incorporating an ion exchange gel between the active layer and the aqueous electrolyte. This device works by taking up biologically relevant ions from solution and injecting more hydrophobic ions into the active layer. Using poly[2,5-bis(3-tetradecylthiophen-2-yl) thieno[3,2-b]thiophene] as the active layer and a blend of an ionic liquid, 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide, and poly(vinylidene fluoride-co-hexafluoropropylene) as the ion exchange gel, four orders of magnitude improvement in device transconductance and a 100-fold increase in kinetics are demonstrated. The ability of the ion-exchange-gel OECT to record biological signals by measuring the action potentials of a Venus flytrap is demonstrated. These results show the possibility of using interface engineering to open up a wider palette of organic semiconductors as OECTs that can be gated by aqueous solutions. 相似文献
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Dimitrios A. Koutsouras Fabrizio Torricelli Paschalis Gkoupidenis Paul W. M. Blom 《Advanced Materials Technologies》2021,6(12):2100732
Organic electrochemical transistors (OECTs) are electrolyte-gated transistors, employing an electrolyte between their gate and channel instead of an insulating layer. For efficient gating, non-polarizable electrodes, for example, Ag/AgCl, are typically used but unfortunately, this simple approach limits the options for multiple gate integration. Patterned polarizable Au gates on the other hand, show strongly reduced gating due to a large voltage drop at the gate/electrolyte interface. Here, an alternative, simple yet effective method for efficient OECT gating by scalable in-plane gate electrodes, is demonstrated. The fact that poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS) exhibits a volumetric capacitance in an electrolyte is made use of. As a result, the capacitance of PEDOT:PSS-based gates can be strongly enhanced by increasing their thickness, thereby reducing the voltage loss at the gate/electrolyte interface. By combining spin coating and electrodeposition, planar electrodes of various thicknesses are created on a multi-gated OECT chip and their effect on the gating efficiency, examined. It is shown that the gating performed by an in-plane PEDOT:PSS electrode can be tuned to be comparable to the one obtained by a Ag/AgCl electrode. Overall, the realization of efficient gating with in-plane electrodes paves the way toward integration of OECT-based biosensors and “organ-on-a-chip” platforms. 相似文献
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Maximilian Moser Tania Cecilia Hidalgo Jokubas Surgailis Johannes Gladisch Sarbani Ghosh Rajendar Sheelamanthula Quentin Thiburce Alexander Giovannitti Alberto Salleo Nicola Gasparini Andrew Wadsworth Igor Zozoulenko Magnus Berggren Eleni Stavrinidou Sahika Inal Iain McCulloch 《Advanced materials (Deerfield Beach, Fla.)》2020,32(37):2002748
A series of glycolated polythiophenes for use in organic electrochemical transistors (OECTs) is designed and synthesized, differing in the distribution of their ethylene glycol chains that are tethered to the conjugated backbone. While side chain redistribution does not have a significant impact on the optoelectronic properties of the polymers, this molecular engineering strategy strongly impacts the water uptake achieved in the polymers. By careful optimization of the water uptake in the polymer films, OECTs with unprecedented steady-state performances in terms of [μC*] and current retentions up to 98% over 700 electrochemical switching cycles are developed. 相似文献
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Organic Electrochemical Transistors: Electrocardiographic Recording with Conformable Organic Electrochemical Transistor Fabricated on Resorbable Bioscaffold (Adv. Mater. 23/2014) 
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下载免费PDF全文 Alessandra Campana Tobias Cramer Daniel T. Simon Magnus Berggren Fabio Biscarini 《Advanced materials (Deerfield Beach, Fla.)》2014,26(23):3873-3873
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Magnus Berggren Xavier Crispin Simone Fabiano Magnus P. Jonsson Daniel T. Simon Eleni Stavrinidou Klas Tybrandt Igor Zozoulenko 《Advanced materials (Deerfield Beach, Fla.)》2019,31(22)
The coupling between charge accumulation in a conjugated polymer and the ionic charge compensation, provided from an electrolyte, defines the mode of operation in a vast array of different organic electrochemical devices. The most explored mixed organic ion–electron conductor, serving as the active electrode in these devices, is poly(3,4‐ethyelenedioxythiophene) doped with polystyrelensulfonate (PEDOT:PSS). In this progress report, scientists of the Laboratory of Organic Electronics at Linköping University review some of the achievements derived over the last two decades in the field of organic electrochemical devices, in particular including PEDOT:PSS as the active material. The recently established understanding of the volumetric capacitance and the mixed ion–electron charge transport properties of PEDOT are described along with examples of various devices and phenomena utilizing this ion–electron coupling, such as the organic electrochemical transistor, ionic–electronic thermodiffusion, electrochromic devices, surface switches, and more. One of the pioneers in this exciting research field is Prof. Olle Inganäs and the authors of this progress report wish to celebrate and acknowledge all the fantastic achievements and inspiration accomplished by Prof. Inganäs all since 1981. 相似文献
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Federica Mariani Felipe Conzuelo Tobias Cramer Isacco Gualandi Luca Possanzini Marta Tessarolo Beatrice Fraboni Wolfgang Schuhmann Erika Scavetta 《Small (Weinheim an der Bergstrasse, Germany)》2019,15(42)
A comprehensive understanding of electrochemical and physical phenomena originating the response of electrolyte‐gated transistors is crucial for improved handling and design of these devices. However, the lack of suitable tools for direct investigation of microscale effects has hindered the possibility to bridge the gap between experiments and theoretical models. In this contribution, a scanning probe setup is used to explore the operation mechanisms of organic electrochemical transistors by probing the local electrochemical potential of the organic film composing the device channel. Moreover, an interpretative model is developed in order to highlight the meaning of electrochemical doping and to show how the experimental data can give direct access to fundamental device parameters, such as local charge carrier concentration and mobility. This approach is versatile and provides insight into the organic semiconductor/electrolyte interface and useful information for materials characterization, device scaling, and sensing optimization. 相似文献
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Charalampos Pitsalidis Anna‐Maria Pappa Mintu Porel Christine M. Artim Gregorio C. Faria Duc D. Duong Christopher A. Alabi Susan Daniel Alberto Salleo Róisín M. Owens 《Advanced materials (Deerfield Beach, Fla.)》2018,30(39)
Antibiotic discovery has experienced a severe slowdown in terms of discovery of new candidates. In vitro screening methods using phospholipids to model the bacterial membrane provide a route to identify molecules that specifically disrupt bacterial membranes causing cell death. Thanks to the electrically insulating properties of the major component of the cell membrane, phospholipids, electronic devices are highly suitable transducers of membrane disruption. The organic electrochemical transistor (OECT) is a highly sensitive ion‐to‐electron converter. Here, the OECT is used as a transducer of the permeability of a lipid monolayer (ML) at a liquid:liquid interface, designed to read out changes in ion flux caused by compounds that interact with, and disrupt, lipid assembly. This concept is illustrated using the well‐documented antibiotic Polymixin B and the highly sensitive quantitation of permeability of the lipid ML induced by two novel recently described antibacterial amine‐based oligothioetheramides is shown, highlighting molecular scale differences in their disruption capabilities. It is anticipated that this platform has the potential to play a role in front‐line antimicrobial compound design and characterization thanks to the compatibility of semiconductor microfabrication technology with high‐throughput readouts. 相似文献
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Xudong Ji Ho Yuen Lau Xiaochen Ren Boyu Peng Peng Zhai Shien‐Ping Feng Paddy K. L. Chan 《Advanced Materials Technologies》2016,1(5)
Organic electrochemical transistors (OECTs) are used as highly sensitive glucose and lactate sensors by modifying the gate electrode with glucose oxidase/lactate oxidase and poly(n‐vinyl‐2‐pyrrolidone)‐capped platinum nanoparticles (Pt NPs). The Pt NPs are deposited by using a two‐step dip coating method without bias instead of the conventional electrodeposition method and followed by an UV‐Ozone post treatment to enhance the catalytic ability of the Pt NPs. The modified OECT sensors have extremely high sensitivity, and can achieve a detection limit of glucose and lactate down to 10−7 and 10−6m , respectively. A polydimethylsiloxane microfluidic channel is successfully integrated with the OECT sensors, which provides a compact chip size of the sensors, a short detection time of around 1 min and extremely low consumption of analyte (30 L). The cross talk between individual sensors in multianalyte sensing devices is also reduced by the dual microfluidic channel structure. Practical applications, such as for detecting glucose in saliva, can therefore be realized, and a prototype of a portable glucose sensor has been successfully created in this study. This portable glucose sensor has excellent potential for real‐time and noninvasive glucose sensing applications. 相似文献
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Alexander Giovannitti Reem B. Rashid Quentin Thiburce Bryan D. Paulsen Camila Cendra Karl Thorley Davide Moia J. Tyler Mefford David Hanifi Du Weiyuan Maximilian Moser Alberto Salleo Jenny Nelson Iain McCulloch Jonathan Rivnay 《Advanced materials (Deerfield Beach, Fla.)》2020,32(16):1908047
Avoiding faradaic side reactions during the operation of electrochemical devices is important to enhance the device stability, to achieve low power consumption, and to prevent the formation of reactive side-products. This is particularly important for bioelectronic devices, which are designed to operate in biological systems. While redox-active materials based on conducting and semiconducting polymers represent an exciting class of materials for bioelectronic devices, they are susceptible to electrochemical side-reactions with molecular oxygen during device operation. Here, electrochemical side reactions with molecular oxygen are shown to occur during organic electrochemical transistor (OECT) operation using high-performance, state-of-the-art OECT materials. Depending on the choice of the active material, such reactions yield hydrogen peroxide (H2O2), a reactive side-product, which may be harmful to the local biological environment and may also accelerate device degradation. A design strategy is reported for the development of redox-active organic semiconductors based on donor–acceptor copolymers that prevents the formation of H2O2 during device operation. This study elucidates the previously overlooked side-reactions between redox-active conjugated polymers and molecular oxygen in electrochemical devices for bioelectronics, which is critical for the operation of electrolyte-gated devices in application-relevant environments. 相似文献