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Wu R, Wu C, Zhou J, Feng LW, Chen J, Zhao D, Huang W. Effect of channel patterning precision on the performances of vertical OECTs. NANOSCALE 2025; 17:8634-8641. [PMID: 40095510 DOI: 10.1039/d4nr05239k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/19/2025]
Abstract
Precise patterning of electronic functional layers is vital for integrated electronics, where high integration density is required. Similarly, for organic electrochemical transistors (OECTs), the patterning precision of the channel layer is essential for device miniaturization, parasitic capacitance reduction, and accurate performance evaluation. In particular, for an emerging OECT architecture, vertical OECT (vOECT), the effect of patterning precision on key device parameters (such as transconductance (gm) and transient time (τ)) remains unclear. Here, controllable patterning of vOECT channel regions is realized by direct laser etching, where 2-100 μm margin lengths (lM) are left beyond the vertical channel area. By quantitatively analyzing the impact of margin areas on device performance (including drain currents (ID), gm, and τ), it has been found that a larger lM leads to significantly increased ID and gm in both n- and p-type OECTs (106.94% and 61.46% enhancement of ID and 102.92% and 92.59% enhancement of gm in n- and p-type OECTs, respectively, are observed as lM increases), which saturate under an lM of ∼60 μm. Nevertheless, linearly increasing τ (from hundreds of microseconds to a few milliseconds) is observed with increasing lM, revealing that parasitic capacitance outside the channel would result in a longer redox reaction time but not always higher ID and gm. It is revealed that the patterning precision of active layers alters the OECT performances tremendously and can be designed to meet different application requirements (either high amplification capability, high integrating density, or fast response time) in OECT-based electronics.
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Affiliation(s)
- Ruhua Wu
- School of Automation Engineering, University of Electronic Science and Technology of China (UESTC), 611731, Chengdu, China.
| | - Chufeng Wu
- School of Automation Engineering, University of Electronic Science and Technology of China (UESTC), 611731, Chengdu, China.
| | - Jinhao Zhou
- School of Automation Engineering, University of Electronic Science and Technology of China (UESTC), 611731, Chengdu, China.
| | - Liang-Wen Feng
- Key Laboratory of Green Chemistry & Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610065, China
| | - Jianhua Chen
- Department of Chemical Science and Technology, Yunnan University, Kunming, China
| | - Dan Zhao
- School of Automation Engineering, University of Electronic Science and Technology of China (UESTC), 611731, Chengdu, China.
| | - Wei Huang
- School of Automation Engineering, University of Electronic Science and Technology of China (UESTC), 611731, Chengdu, China.
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2
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Liu Y, Li R, Bai Z, Chen J, Wang K, Hou C, Zhang Q, Li Y, Li K, Wang H. Liquid-Phase Electrochemically Autooxidized Doping of PEDOT Enabling Fabry-Pérot Electrochromic Pixels. NANO LETTERS 2025; 25:5035-5042. [PMID: 40094437 DOI: 10.1021/acs.nanolett.5c00604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/19/2025]
Abstract
Fabry-Pérot (F-P) resonators enhance light-matter interactions and are sought to incorporate stable, flexible poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). However, existing additives for PSS phase separation to enhance conductivity lack the ability to modify optical dielectric properties of PEDOT for augmenting optical resonation. Here, we developed a synergistic strategy that combines electrochemical autooxidized doping with phase separation through simple solution mixing of polyoxometalates. The approach reduces the band gap of PEDOT and significantly enhances the conductivity from 1.03 to 360 S cm-1. Thus, the F-P resonators extend PEDOT's single blue state to multicolor variations. The autooxidized PEDOT was also employed as the electrochemical active layers for organic electrochemical transistors (OECTs) and electrochromic (EC) F-P array pixels (1 × 1 mm). The OECTs with a 1000-fold on/off ratio can control the color changes of EC pixels with a low gate voltage of only ±0.8 V.
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Affiliation(s)
- Yongsheng Liu
- State Key Laboratory of Advanced Fiber Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China
| | - Ran Li
- State Key Laboratory of Advanced Fiber Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China
| | - Zhiyuan Bai
- School of Energy and Materials Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, People's Republic of China
| | - Jiaqi Chen
- State Key Laboratory of Advanced Fiber Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China
| | - Kun Wang
- State Key Laboratory of Advanced Fiber Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China
| | - Chengyi Hou
- State Key Laboratory of Advanced Fiber Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China
| | - Qinghong Zhang
- Engineering Research Center of Advanced Glass Manufacturing Technology Ministry of Education, College of Materials Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China
| | - Yaogang Li
- Engineering Research Center of Advanced Glass Manufacturing Technology Ministry of Education, College of Materials Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China
| | - Kerui Li
- State Key Laboratory of Advanced Fiber Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China
| | - Hongzhi Wang
- State Key Laboratory of Advanced Fiber Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, People's Republic of China
- School of Materials Science and Engineering, Shanghai Dianji University, Shanghai 201306, People's Republic of China
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3
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Granelli R, Kovács-Vajna ZM, Torricelli F. Additive Manufacturing of Organic Electrochemical Transistors: Methods, Device Architectures, and Emerging Applications. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2025; 21:e2410499. [PMID: 39945058 PMCID: PMC11922034 DOI: 10.1002/smll.202410499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2024] [Revised: 01/14/2025] [Indexed: 03/20/2025]
Abstract
Organic electrochemical transistors (OECTs) are key devices in a large set of application fields including bioelectronics, neuromorphics, sensing, and flexible electronics. This review explores the advancements in additive manufacturing techniques accounting for printing technologies, device architectures, and emerging applications. The promising applications of printed OECTs, ranging from biochemical sensors to neuromorphic computing are examined, showcasing their versatility. Despite significant advancements, ongoing challenges persist, such as material-related issues, inconsistencies in film homogeneity, and the scalability of integration processes. This review identifies these critical obstacles and offers targeted solutions and future research directions aimed at enhancing the performance and reliability of fully-printed OECTs. By addressing these challenges, the aim of this study is to facilitate the development of next-generation OECTs that can meet the demands of emerging applications in sustainable and intelligent electronic and bioelectronic systems.
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Affiliation(s)
- Roberto Granelli
- Department of Information Engineering, University of Brescia, via Branze 38, Brescia, 25123, Italy
| | - Zsolt M Kovács-Vajna
- Department of Information Engineering, University of Brescia, via Branze 38, Brescia, 25123, Italy
| | - Fabrizio Torricelli
- Department of Information Engineering, University of Brescia, via Branze 38, Brescia, 25123, Italy
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4
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Bisquert J, Keene ST. Using the Transversal Admittance to Understand Organic Electrochemical Transistors. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2025; 12:e2410393. [PMID: 39587828 PMCID: PMC11744701 DOI: 10.1002/advs.202410393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2024] [Revised: 10/27/2024] [Indexed: 11/27/2024]
Abstract
The transient behavior of organic electrochemical transistors (OECTs) is complex due to mixed ionic-electronic properties that play a central role in bioelectronics and neuromorphic applications. Some works applied impedance spectroscopy in OECTs for understanding transport properties and the frequency-dependent response of devices. The transversal admittance (drain current vs gate voltage) is used for sensing applications. However, a general theory of the transversal admittance, until now, has been incomplete. The derive a model that combines electronic motion along the channel and vertical ion diffusion by insertion from the electrolyte, depending on several features as the chemical capacitance, the diffusion coefficient of ions, and the electronic mobility. Based on transport and charge conservation equations, it is shown that the vertical impedance produces a standard result of diffusion in intercalation systems, while the transversal impedance contains the electronic parameters of hole accumulation and transport along the channel. The spectral shapes of drain and gate currents and the complex admittance spectra are established by reference to equivalent circuit models for the vertical and transversal impedances, that describe well the measurements of a PEDOT:PSS OECT. New insights are provided to the determination of mobility by the ratio between drain and gate currents.
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Affiliation(s)
- Juan Bisquert
- Instituto de Tecnología Química (Universitat Politècnica de València‐Agencia Estatal Consejo Superior de Investigaciones Científicas)Av. dels TarongersValència46022Spain
| | - Scott T. Keene
- Department of EngineeringElectrical Engineering DivisionUniversity of CambridgeCambridgeCB3 0FAUK
- Cavendish LaboratoryDepartment of PhysicsUniversity of CambridgeCambridgeCB3 0HEUK
- Department of Materials Science and NanoEngineeringRice UniversityHoustonTX77030USA
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5
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Chen J, Fang Y, Feng J, Shi X, Li J, Wang S, Zhang S, Peng H, Sun X. Fast-response fiber organic electrochemical transistor with vertical channel design for electrophysiological monitoring. J Mater Chem B 2024; 12:9206-9212. [PMID: 39248714 DOI: 10.1039/d4tb01426j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/10/2024]
Abstract
Fiber organic electrochemical transistors (OECTs) hold significant promise for in vivo bio-signal amplification due to their minimally invasive and seamless integration with biological tissues. However, their use in monitoring rapid physiological changes, such as electrophysiological signals, has been constrained by slow response time, arising from their extensive channel dimensions. Here, we introduce a novel fiber OECT designed with a micro-scale vertical channel (F-vOECT) that substantially reduces the response time by an order of magnitude to 12 ms and achieves a maximum transconductance of 16 mS at zero gate bias, marking a substantial improvement over previous fiber OECTs. This compact and flexible fiber device demonstrates robust performance under cyclic switching, dynamic deformation and exhibits excellent biocompatibility. When subcutaneously implanted in rats, the F-vOECT enables stable, continuous electrocardiogram monitoring for 7 days, successfully identifying episodes of atrioventricular block. These capabilities illustrate its potential for clinical electrophysiological diagnostics. The design strategy of F-vOECT opens new avenues for developing fast-responsive fiber bioelectronic devices.
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Affiliation(s)
- Jiawei Chen
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Institute of Fiber Materials and Devices, and Laboratory of Advanced Materials, Fudan University, Shanghai, 200438, China.
| | - Yuan Fang
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Institute of Fiber Materials and Devices, and Laboratory of Advanced Materials, Fudan University, Shanghai, 200438, China.
| | - Jianyou Feng
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Institute of Fiber Materials and Devices, and Laboratory of Advanced Materials, Fudan University, Shanghai, 200438, China.
| | - Xiang Shi
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Institute of Fiber Materials and Devices, and Laboratory of Advanced Materials, Fudan University, Shanghai, 200438, China.
| | - Jinyan Li
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Institute of Fiber Materials and Devices, and Laboratory of Advanced Materials, Fudan University, Shanghai, 200438, China.
| | - Shuzhuang Wang
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Institute of Fiber Materials and Devices, and Laboratory of Advanced Materials, Fudan University, Shanghai, 200438, China.
| | - Songlin Zhang
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Institute of Fiber Materials and Devices, and Laboratory of Advanced Materials, Fudan University, Shanghai, 200438, China.
| | - Huisheng Peng
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Institute of Fiber Materials and Devices, and Laboratory of Advanced Materials, Fudan University, Shanghai, 200438, China.
| | - Xuemei Sun
- State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Institute of Fiber Materials and Devices, and Laboratory of Advanced Materials, Fudan University, Shanghai, 200438, China.
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6
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Kim Y, Kimpel J, Giovannitti A, Müller C. Small signal analysis for the characterization of organic electrochemical transistors. Nat Commun 2024; 15:7606. [PMID: 39218920 PMCID: PMC11366767 DOI: 10.1038/s41467-024-51883-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2024] [Accepted: 08/19/2024] [Indexed: 09/04/2024] Open
Abstract
A method for the characterization of organic electrochemical transistors (OECTs) based on small signal analysis is presented that allows to determine the electronic mobility as a function of continuous gate potential using a standard two-channel AC potentiostat. Vector analysis in the frequency domain allows to exclude parasitic components in both ionic and electronic conduction regardless of film thickness, thus resulting in a standard deviation as low as 4%. Besides the electronic mobility, small signal analysis of OECTs also provides information about a wide range of other parameters including the conductance, transconductance, conductivity and volumetric capacitance through a single measurement. General applicability of small signal analysis is demonstrated by characterizing devices based on n-type, p-type, and ambipolar materials operating in accumulation or depletion modes. Accurate benchmarking of organic mixed ionic-electronic conductors through small signal analysis can be anticipated to guide both materials development and the design of bioelectronic devices.
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Affiliation(s)
- Youngseok Kim
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Göteborg, Sweden.
| | - Joost Kimpel
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Göteborg, Sweden
| | - Alexander Giovannitti
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Göteborg, Sweden
| | - Christian Müller
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, Göteborg, Sweden.
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7
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Bisquert J, Ilyassov B, Tessler N. Switching Response in Organic Electrochemical Transistors by Ionic Diffusion and Electronic Transport. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2404182. [PMID: 39052878 PMCID: PMC11423187 DOI: 10.1002/advs.202404182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2024] [Revised: 06/24/2024] [Indexed: 07/27/2024]
Abstract
The switching response in organic electrochemical transistors (OECT) is a basic effect in which a transient current occurs in response to a voltage perturbation. This phenomenon has an important impact on different aspects of the application of OECT, such as the equilibration times, the hysteresis dependence on scan rates, and the synaptic properties for neuromorphic applications. Here we establish a model that unites vertical ion diffusion and horizontal electronic transport for the analysis of the time-dependent current response of OECTs. We use a combination of tools consisting of a physical analytical model; advanced 2D drift-diffusion simulation; and the experimental measurement of a poly(3-hexylthiophene) (P3HT) OECT. We show the reduction of the general model to simple time-dependent equations for the average ionic/hole concentration inside the organic film, which produces a Bernards-Malliaras conservation equation coupled with a diffusion equation. We provide a basic classification of the transient response to a voltage pulse, and the correspondent hysteresis effects of the transfer curves. The shape of transients is basically related to the main control phenomenon, either the vertical diffusion of ions during doping and dedoping, or the equilibration of electronic current along the channel length.
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Affiliation(s)
- Juan Bisquert
- Instituto de Tecnología Química (Universitat Politècnica de València-Agencia Estatal Consejo Superior de Investigaciones Científicas), Av. dels Tarongers, València, 46022, Spain
- Institute of Advanced Materials (INAM), Universitat Jaume I, Castelló, 12006, Spain
| | - Baurzhan Ilyassov
- Astana IT University, Mangilik El 55/11, EXPO C1, Astana, 010000, Kazakhstan
| | - Nir Tessler
- Andrew & Erna Viterbi Department of Electrical and Computer Engineering, Technion-Israel Institute of Technology, Haifa, 32000, Israel
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8
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Zhao C, Yang J, Ma W. Transient Response and Ionic Dynamics in Organic Electrochemical Transistors. NANO-MICRO LETTERS 2024; 16:233. [PMID: 38954272 PMCID: PMC11219702 DOI: 10.1007/s40820-024-01452-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/12/2024] [Accepted: 06/05/2024] [Indexed: 07/04/2024]
Abstract
The rapid development of organic electrochemical transistors (OECTs) has ushered in a new era in organic electronics, distinguishing itself through its application in a variety of domains, from high-speed logic circuits to sensitive biosensors, and neuromorphic devices like artificial synapses and organic electrochemical random-access memories. Despite recent strides in enhancing OECT performance, driven by the demand for superior transient response capabilities, a comprehensive understanding of the complex interplay between charge and ion transport, alongside electron-ion interactions, as well as the optimization strategies, remains elusive. This review aims to bridge this gap by providing a systematic overview on the fundamental working principles of OECT transient responses, emphasizing advancements in device physics and optimization approaches. We review the critical aspect of transient ion dynamics in both volatile and non-volatile applications, as well as the impact of materials, morphology, device structure strategies on optimizing transient responses. This paper not only offers a detailed overview of the current state of the art, but also identifies promising avenues for future research, aiming to drive future performance advancements in diversified applications.
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Affiliation(s)
- Chao Zhao
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, People's Republic of China
| | - Jintao Yang
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, People's Republic of China
| | - Wei Ma
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, People's Republic of China.
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9
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Kim H, Won Y, Song HW, Kwon Y, Jun M, Oh JH. Organic Mixed Ionic-Electronic Conductors for Bioelectronic Sensors: Materials and Operation Mechanisms. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2306191. [PMID: 38148583 PMCID: PMC11251567 DOI: 10.1002/advs.202306191] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 12/18/2023] [Indexed: 12/28/2023]
Abstract
The field of organic mixed ionic-electronic conductors (OMIECs) has gained significant attention due to their ability to transport both electrons and ions, making them promising candidates for various applications. Initially focused on inorganic materials, the exploration of mixed conduction has expanded to organic materials, especially polymers, owing to their advantages such as solution processability, flexibility, and property tunability. OMIECs, particularly in the form of polymers, possess both electronic and ionic transport functionalities. This review provides an overview of OMIECs in various aspects covering mechanisms of charge transport including electronic transport, ionic transport, and ionic-electronic coupling, as well as conducting/semiconducting conjugated polymers and their applications in organic bioelectronics, including (multi)sensors, neuromorphic devices, and electrochromic devices. OMIECs show promise in organic bioelectronics due to their compatibility with biological systems and the ability to modulate electronic conduction and ionic transport, resembling the principles of biological systems. Organic electrochemical transistors (OECTs) based on OMIECs offer significant potential for bioelectronic applications, responding to external stimuli through modulation of ionic transport. An in-depth review of recent research achievements in organic bioelectronic applications using OMIECs, categorized based on physical and chemical stimuli as well as neuromorphic devices and circuit applications, is presented.
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Affiliation(s)
- Hyunwook Kim
- School of Chemical and Biological EngineeringInstitute of Chemical ProcessesSeoul National University1 Gwanak‐roGwanak‐guSeoul08826Republic of Korea
| | - Yousang Won
- School of Chemical and Biological EngineeringInstitute of Chemical ProcessesSeoul National University1 Gwanak‐roGwanak‐guSeoul08826Republic of Korea
| | - Hyun Woo Song
- School of Chemical and Biological EngineeringInstitute of Chemical ProcessesSeoul National University1 Gwanak‐roGwanak‐guSeoul08826Republic of Korea
| | - Yejin Kwon
- School of Chemical and Biological EngineeringInstitute of Chemical ProcessesSeoul National University1 Gwanak‐roGwanak‐guSeoul08826Republic of Korea
| | - Minsang Jun
- School of Chemical and Biological EngineeringInstitute of Chemical ProcessesSeoul National University1 Gwanak‐roGwanak‐guSeoul08826Republic of Korea
| | - Joon Hak Oh
- School of Chemical and Biological EngineeringInstitute of Chemical ProcessesSeoul National University1 Gwanak‐roGwanak‐guSeoul08826Republic of Korea
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10
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Kelly AR, Glover DJ. Information Transmission through Biotic-Abiotic Interfaces to Restore or Enhance Human Function. ACS APPLIED BIO MATERIALS 2024; 7:3605-3628. [PMID: 38729914 DOI: 10.1021/acsabm.4c00435] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/12/2024]
Abstract
Advancements in reliable information transfer across biotic-abiotic interfaces have enabled the restoration of lost human function. For example, communication between neuronal cells and electrical devices restores the ability to walk to a tetraplegic patient and vision to patients blinded by retinal disease. These impactful medical achievements are aided by tailored biotic-abiotic interfaces that maximize information transfer fidelity by considering the physical properties of the underlying biological and synthetic components. This Review develops a modular framework to define and describe the engineering of biotic and abiotic components as well as the design of interfaces to facilitate biotic-abiotic information transfer using light or electricity. Delineating the properties of the biotic, interface, and abiotic components that enable communication can serve as a guide for future research in this highly interdisciplinary field. Application of synthetic biology to engineer light-sensitive proteins has facilitated the control of neural signaling and the restoration of rudimentary vision after retinal blindness. Electrophysiological methodologies that use brain-computer interfaces and stimulating implants to bypass spinal column injuries have led to the rehabilitation of limb movement and walking ability. Cellular interfacing methodologies and on-chip learning capability have been made possible by organic transistors that mimic the information processing capacity of neurons. The collaboration of molecular biologists, material scientists, and electrical engineers in the emerging field of biotic-abiotic interfacing will lead to the development of prosthetics capable of responding to thought and experiencing touch sensation via direct integration into the human nervous system. Further interdisciplinary research will improve electrical and optical interfacing technologies for the restoration of vision, offering greater visual acuity and potentially color vision in the near future.
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Affiliation(s)
- Alexander R Kelly
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW 2052, Australia
| | - Dominic J Glover
- School of Biotechnology and Biomolecular Sciences, University of New South Wales, Sydney, NSW 2052, Australia
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11
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Keene ST, Laulainen JEM, Pandya R, Moser M, Schnedermann C, Midgley PA, McCulloch I, Rao A, Malliaras GG. Hole-limited electrochemical doping in conjugated polymers. NATURE MATERIALS 2023; 22:1121-1127. [PMID: 37414944 PMCID: PMC10465356 DOI: 10.1038/s41563-023-01601-5] [Citation(s) in RCA: 34] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 06/01/2023] [Indexed: 07/08/2023]
Abstract
Simultaneous transport and coupling of ionic and electronic charges is fundamental to electrochemical devices used in energy storage and conversion, neuromorphic computing and bioelectronics. While the mixed conductors enabling these technologies are widely used, the dynamic relationship between ionic and electronic transport is generally poorly understood, hindering the rational design of new materials. In semiconducting electrodes, electrochemical doping is assumed to be limited by motion of ions due to their large mass compared to electrons and/or holes. Here, we show that this basic assumption does not hold for conjugated polymer electrodes. Using operando optical microscopy, we reveal that electrochemical doping speeds in a state-of-the-art polythiophene can be limited by poor hole transport at low doping levels, leading to substantially slower switching speeds than expected. We show that the timescale of hole-limited doping can be controlled by the degree of microstructural heterogeneity, enabling the design of conjugated polymers with improved electrochemical performance.
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Affiliation(s)
- Scott T Keene
- Electrical Engineering Division, Department of Engineering, University of Cambridge, Cambridge, UK.
- Cavendish Laboratory, University of Cambridge, Cambridge, UK.
| | | | - Raj Pandya
- Cavendish Laboratory, University of Cambridge, Cambridge, UK
- Laboratoire Kastler Brossel, École Normale Supérieure, Université PSL, CNRS, Sorbonne Université, Collège de France, Paris, France
| | | | | | - Paul A Midgley
- Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, UK
| | - Iain McCulloch
- Department of Chemistry, University of Oxford, Oxford, UK
- KAUST Solar Center, King Abdullah University of Science and Technology, Thuwal, Saudi Arabia
| | - Akshay Rao
- Cavendish Laboratory, University of Cambridge, Cambridge, UK.
| | - George G Malliaras
- Electrical Engineering Division, Department of Engineering, University of Cambridge, Cambridge, UK.
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12
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Oh SH, Oh M, Lee S, Kim DK, Lee JS, Lee SK, Kang SK, Joo YC. Fast and Durable Nanofiber Mat Channel Organic Electrochemical Transistors. ACS APPLIED MATERIALS & INTERFACES 2023; 15:39614-39624. [PMID: 37556112 DOI: 10.1021/acsami.3c04590] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/10/2023]
Abstract
Bioelectronic devices that offer real-time measurements, biological signal processing, and continuous monitoring while maintaining stable performance are in high demand. The materials used in organic electrochemical transistors (OECTs) demonstrate high transconductance (GM) and excellent biocompatibility, making them suitable for bioelectronics in a biological environment. However, ion migration in OECTs induces a delayed response time and low cut-off frequency, and the adverse biological environment causes OECT durability problems. Herein, we present OECTs with a faster response time and improved durability, made possible by using a nanofiber mat channel of a conventional OECT structure. Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate (PEDOT:PSS)/polyacrylamide (PAAm) nanofiber mat channel OECTs are fabricated and subjected to various durability tests for the first time based on continuous measurements and mechanical stability assessments. The results indicate that the nanofiber mat channel OECTs have a faster response time and longer life spans compared to those of film channel OECTs. The improvements can be attributed to the increased surface area and fibrous structure of the nanofiber mat channel. Furthermore, the hydrogel helps to maintain the structure of the nanofiber, facilitates material exchange, and eliminates the need for a crosslinker.
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Affiliation(s)
- Seung-Hyun Oh
- Department of Materials Science & Engineering, Seoul National University, Seoul 151-744, Korea
| | - Minseok Oh
- Department of Materials Science & Engineering, Seoul National University, Seoul 151-744, Korea
| | - Seongi Lee
- Department of Materials Science & Engineering, Seoul National University, Seoul 151-744, Korea
| | - Do-Kyun Kim
- Department of Materials Science & Engineering, Seoul National University, Seoul 151-744, Korea
| | - Jong-Sung Lee
- Department of Materials Science & Engineering, Seoul National University, Seoul 151-744, Korea
| | - Sol-Kyu Lee
- Department of Materials Science & Engineering, Seoul National University, Seoul 151-744, Korea
| | - Seung-Kyun Kang
- Department of Materials Science & Engineering, Seoul National University, Seoul 151-744, Korea
| | - Young-Chang Joo
- Department of Materials Science & Engineering, Seoul National University, Seoul 151-744, Korea
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13
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Cong S, Chen J, Ding B, Lan L, Wang Y, Chen C, Li Z, Heeney M, Yue W. Tunable control of the performance of aqueous-based electrochemical devices by post-polymerization functionalization. MATERIALS HORIZONS 2023; 10:3090-3100. [PMID: 37218468 DOI: 10.1039/d3mh00418j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Functionalized polymeric mixed ionic-electronic conductors (PMIECs) are highly desired for the development of electrochemical applications, yet are hindered by the limited conventional synthesis techniques. Here, we propose a "graft-onto-polymer" synthesis strategy by post-polymerization functionalization (GOP-PPF) to prepare a family of PMIECs sharing the same backbone while functionalized with varying ethylene glycol (EG) compositions (two, four, and six EG repeating units). Unlike the typical procedure, GOP-PPF uses a nucleophilic aromatic substitution reaction for the facile and versatile attachment of functional units to a pre-synthesized conjugated-polymer precursor. Importantly, these redox-active PMIECs are investigated as a platform for energy storage devices and organic electrochemical transistors (OECTs) in aqueous media. The ion diffusivity, charge mobility and charge-storage capacity can be significantly improved by optimizing the EG composition. Specifically, g2T2-gBT6 containing the highest EG density gives the highest charge-storage capacity exceeding 180 F g-1 among the polymer series, resulting from the improved ion diffusivity. Moreover, g2T2-gBT4 with four EG repeating units exhibits a superior performance compared to its two analogues in OECTs, associated with a high μC* up to 359 F V-1 cm-1 s-1, owing to the optimal balance between ionic-electronic coupling and charge mobility. Through the GOP-PPF, PMIECs can be tailored to access desirable performance metrics at the molecular level.
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Affiliation(s)
- Shengyu Cong
- Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, People's Republic of China.
| | - Junxin Chen
- Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, People's Republic of China.
| | - Bowen Ding
- Department of Chemistry and Centre for Processable Electronics, Imperial College London, Molecular Sciences Research Hub (White City Campus), 80 Wood Lane Shepherd's Bush, London W12 0BZ, UK.
| | - Liuyuan Lan
- Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, People's Republic of China.
| | - Yazhou Wang
- Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, People's Republic of China.
| | - Chaoyue Chen
- Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, People's Republic of China.
| | - Zhengke Li
- Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, People's Republic of China.
| | - Martin Heeney
- Department of Chemistry and Centre for Processable Electronics, Imperial College London, Molecular Sciences Research Hub (White City Campus), 80 Wood Lane Shepherd's Bush, London W12 0BZ, UK.
- KAUST Solar Center (KSC), Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), Thuwal, 23955-6900, Saudi Arabia
| | - Wan Yue
- Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, School of Materials Science and Engineering, Sun Yat-sen University, Guangzhou 510275, People's Republic of China.
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14
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Ohayon D, Druet V, Inal S. A guide for the characterization of organic electrochemical transistors and channel materials. Chem Soc Rev 2023; 52:1001-1023. [PMID: 36637165 DOI: 10.1039/d2cs00920j] [Citation(s) in RCA: 62] [Impact Index Per Article: 31.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
The organic electrochemical transistor (OECT) is one of the most versatile devices within the bioelectronics toolbox, with its compatibility with aqueous media and the ability to transduce and amplify ionic and biological signals into an electronic output. The OECT operation relies on the mixed (ionic and electronic charge) conduction properties of the material in its channel. With the increased popularity of OECTs in bioelectronics applications and to benchmark mixed conduction properties of channel materials, the characterization methods have broadened somewhat heterogeneously. We intend this review to be a guide for the characterization methods of the OECT and the channel materials used. Our review is composed of two main sections. First, we review techniques to fabricate the OECT, introduce different form factors and configurations, and describe the device operation principle. We then discuss the OECT performance figures of merit and detail the experimental procedures to obtain these characteristics. In the second section, we shed light on the characterization of mixed transport properties of channel materials and describe how to assess films' interactions with aqueous electrolytes. In particular, we introduce experimental methods to monitor ion motion and diffusion, charge carrier mobility, and water uptake in the films. We also discuss a few theoretical models describing ion-polymer interactions. We hope that the guidelines we bring together in this review will help researchers perform a more comprehensive and consistent comparison of new materials and device designs, and they will be used to identify advances and opportunities to improve the device performance, progressing the field of organic bioelectronics.
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Affiliation(s)
- David Ohayon
- King Abdullah University of Science and Technology (KAUST), Biological and Environmental Science and Engineering Division, Organic Bioelectronics Laboratory, Thuwal 23955-6900, Saudi Arabia.
| | - Victor Druet
- King Abdullah University of Science and Technology (KAUST), Biological and Environmental Science and Engineering Division, Organic Bioelectronics Laboratory, Thuwal 23955-6900, Saudi Arabia.
| | - Sahika Inal
- King Abdullah University of Science and Technology (KAUST), Biological and Environmental Science and Engineering Division, Organic Bioelectronics Laboratory, Thuwal 23955-6900, Saudi Arabia.
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15
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Chen J, Cong S, Wang L, Wang Y, Lan L, Chen C, Zhou Y, Li Z, McCulloch I, Yue W. Backbone coplanarity manipulation via hydrogen bonding to boost the n-type performance of polymeric mixed conductors operating in aqueous electrolyte. MATERIALS HORIZONS 2023; 10:607-618. [PMID: 36511773 DOI: 10.1039/d2mh01100j] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
The development of high-performance n-type semiconducting polymers remains a significant challenge. Reported here is the construction of a coplanar backbone via intramolecular hydrogen bonds to dramatically enhance the performance of n-type polymeric mixed conductors operating in aqueous electrolyte. Specifically, glycolated naphthalene tetracarboxylicdiimide (gNDI) couples with vinylene and thiophene to give gNDI-V and gNDI-T, respectively. The hydrogen bonding functionalities are fused to the backbone to ensure a more coplanar backbone and much tighter π-π stacking of gNDI-V than gNDI-T, which is evidenced by density functional theory simulations and grazing-incidence wide-angle X-ray scattering. Importantly, these copolymers are fabricated as the active layer of the aqueous-based electrochromic devices and organic electrochemical transistors (OECTs). gNDI-V exhibits a larger electrochromic contrast (ΔT = 30%) and a higher coloration efficiency (1988 cm2 C-1) than gNDI-T owing to its more efficient ionic-electronic coupling. Moreover, gNDI-V gives the highest electron mobility (0.014 cm2 V-1 s-1) and μC* (2.31 FV-1 cm-1 s-1) reported to date for NDI-based copolymers in OECTs, attributed to the improved thin-film crystallinity and molecular packing promoted by hydrogen bonds. Overall, this work marks a remarkable advance in the n-type polymeric mixed conductors and the hydrogen bond functionalization strategy opens up an avenue to access desirable performance metrics for aqueous-based electrochemical devices.
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Affiliation(s)
- Junxin Chen
- Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, P. R. China.
| | - Shengyu Cong
- Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, P. R. China.
| | - Lewen Wang
- Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, P. R. China.
| | - Yazhou Wang
- Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, P. R. China.
| | - Liuyuan Lan
- Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, P. R. China.
| | - Chaoyue Chen
- Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, P. R. China.
| | - Yecheng Zhou
- Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, P. R. China.
| | - Zhengke Li
- Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, P. R. China.
| | - Iain McCulloch
- Department of Chemistry, Chemistry Research Laboratory, University of Oxford, Oxford OX1 3TA, UK
| | - Wan Yue
- Guangzhou Key Laboratory of Flexible Electronic Materials and Wearable Devices, Key Laboratory for Polymeric Composite and Functional Materials of Ministry of Education, School of Materials Science and Engineering, State Key Laboratory of Optoelectronic Materials and Technologies, Sun Yat-sen University, Guangzhou 510275, P. R. China.
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16
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Takemoto A, Araki T, Nishimura K, Akiyama M, Uemura T, Kiriyama K, Koot JM, Kasai Y, Kurihira N, Osaki S, Wakida S, den Toonder JM, Sekitani T. Fully Transparent, Ultrathin Flexible Organic Electrochemical Transistors with Additive Integration for Bioelectronic Applications. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2204746. [PMID: 36373679 PMCID: PMC9839865 DOI: 10.1002/advs.202204746] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Indexed: 06/16/2023]
Abstract
Optical transparency is highly desirable in bioelectronic sensors because it enables multimodal optical assessment during electronic sensing. Ultrathin (<5 µm) organic electrochemical transistors (OECTs) can be potentially used as a highly efficient bioelectronic transducer because they demonstrate high transconductance during low-voltage operation and close conformability to biological tissues. However, the fabrication of fully transparent ultrathin OECTs remains a challenge owing to the harsh etching processes of nanomaterials. In this study, fully transparent, ultrathin, and flexible OECTs are developed using additive integration processes of selective-wetting deposition and thermally bonded lamination. These processes are compatible with Ag nanowire electrodes and conducting polymer channels and realize unprecedented flexible OECTs with high visible transmittance (>90%) and high transconductance (≈1 mS) in low-voltage operations (<0.6 V). Further, electroencephalogram acquisition and nitrate ion sensing are demonstrated in addition to the compatibility of simultaneous assessments of optical blood flowmetry when the transparent OECTs are worn, owing to the transparency. These feasibility demonstrations show promise in contributing to human stress monitoring in bioelectronics.
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Affiliation(s)
- Ashuya Takemoto
- The Institute of Scientific and Industrial Research (SANKEN)Osaka UniversityIbaraki567‐0047Japan
- Department of Applied PhysicsGraduate School of EngineeringOsaka UniversitySuita565‐0871Japan
- Advanced Photonics and Biosensing Open Innovation LaboratoryAIST‐Osaka UniversitySuita565‐0871Japan
| | - Teppei Araki
- The Institute of Scientific and Industrial Research (SANKEN)Osaka UniversityIbaraki567‐0047Japan
- Department of Applied PhysicsGraduate School of EngineeringOsaka UniversitySuita565‐0871Japan
- Advanced Photonics and Biosensing Open Innovation LaboratoryAIST‐Osaka UniversitySuita565‐0871Japan
| | - Kazuya Nishimura
- The Institute of Scientific and Industrial Research (SANKEN)Osaka UniversityIbaraki567‐0047Japan
- Department of Applied PhysicsGraduate School of EngineeringOsaka UniversitySuita565‐0871Japan
- Advanced Photonics and Biosensing Open Innovation LaboratoryAIST‐Osaka UniversitySuita565‐0871Japan
| | - Mihoko Akiyama
- The Institute of Scientific and Industrial Research (SANKEN)Osaka UniversityIbaraki567‐0047Japan
| | - Takafumi Uemura
- The Institute of Scientific and Industrial Research (SANKEN)Osaka UniversityIbaraki567‐0047Japan
- Advanced Photonics and Biosensing Open Innovation LaboratoryAIST‐Osaka UniversitySuita565‐0871Japan
| | - Kazuki Kiriyama
- The Institute of Scientific and Industrial Research (SANKEN)Osaka UniversityIbaraki567‐0047Japan
- Department of Applied PhysicsGraduate School of EngineeringOsaka UniversitySuita565‐0871Japan
- Advanced Photonics and Biosensing Open Innovation LaboratoryAIST‐Osaka UniversitySuita565‐0871Japan
| | - Johan M. Koot
- Department of Mechanical Engineering and Institute for Complex Molecular SystemsEindhoven University of TechnologyEindhoven5600 MBThe Netherlands
| | - Yuko Kasai
- Advanced Photonics and Biosensing Open Innovation LaboratoryAIST‐Osaka UniversitySuita565‐0871Japan
| | - Naoko Kurihira
- The Institute of Scientific and Industrial Research (SANKEN)Osaka UniversityIbaraki567‐0047Japan
| | - Shuto Osaki
- Department of Applied PhysicsGraduate School of EngineeringOsaka UniversitySuita565‐0871Japan
- Advanced Photonics and Biosensing Open Innovation LaboratoryAIST‐Osaka UniversitySuita565‐0871Japan
| | - Shin‐ichi Wakida
- Department of Applied PhysicsGraduate School of EngineeringOsaka UniversitySuita565‐0871Japan
- Advanced Photonics and Biosensing Open Innovation LaboratoryAIST‐Osaka UniversitySuita565‐0871Japan
| | - Jaap M.J. den Toonder
- Department of Mechanical Engineering and Institute for Complex Molecular SystemsEindhoven University of TechnologyEindhoven5600 MBThe Netherlands
| | - Tsuyoshi Sekitani
- The Institute of Scientific and Industrial Research (SANKEN)Osaka UniversityIbaraki567‐0047Japan
- Department of Applied PhysicsGraduate School of EngineeringOsaka UniversitySuita565‐0871Japan
- Advanced Photonics and Biosensing Open Innovation LaboratoryAIST‐Osaka UniversitySuita565‐0871Japan
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17
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Li W, Jin J, Xiong T, Yu P, Mao L. Fast-Scanning Potential-Gated Organic Electrochemical Transistors for Highly Sensitive Sensing of Dopamine in Living Rat Brain. Angew Chem Int Ed Engl 2022; 61:e202204134. [PMID: 35583258 DOI: 10.1002/anie.202204134] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2022] [Indexed: 11/12/2022]
Abstract
Developing techniques for the highly sensitive assay of neurotransmitters is essential for understanding physiological and pathological processes. Here, we demonstrate a fast-scanning potential (FSP)-gated organic electrochemical transistor (OECT): for the highly sensitive sensing of dopamine (DA) in a living rat brain. The configuration combines the selectivity of fast-scan cyclic voltammetry (FSCV) with the high sensitivity of an OECT. The combined use of FSP as a gating mode and transconductance (gm ) as a sensing parameter further improve the sensing performance in terms of sensitivity, limit of detection, reproducibility, and stability. The FSP-OECT exhibits a sensitivity of 0.899 S M-1 and a low limit of detection down to 5 nM and was validated for in vivo monitoring of the basal level and electrically stimulated release of DA.
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Affiliation(s)
- Weiqi Li
- Beijing National Laboratory for Molecular Science, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing, 100190, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Jing Jin
- Beijing National Laboratory for Molecular Science, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing, 100190, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Tianyi Xiong
- Beijing National Laboratory for Molecular Science, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing, 100190, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Ping Yu
- Beijing National Laboratory for Molecular Science, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing, 100190, China.,University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Lanqun Mao
- Beijing National Laboratory for Molecular Science, Key Laboratory of Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences (CAS), Beijing, 100190, China.,College of Chemistry, Beijing Normal University, Beijing, 100875, China
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18
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Li W, Jin J, Xiong T, Yu P, Mao L. Fast‐Scanning Potential‐Gated Organic Electrochemical Transistors for Highly Sensitive Sensing of Dopamine in Living Rat Brain. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202204134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Weiqi Li
- Beijing National Laboratory for Molecular Science Key Laboratory of Analytical Chemistry for Living Biosystems Institute of Chemistry Chinese Academy of Sciences (CAS) Beijing 100190 China
- University of Chinese Academy of Sciences Beijing 100049 China
| | - Jing Jin
- Beijing National Laboratory for Molecular Science Key Laboratory of Analytical Chemistry for Living Biosystems Institute of Chemistry Chinese Academy of Sciences (CAS) Beijing 100190 China
- University of Chinese Academy of Sciences Beijing 100049 China
| | - Tianyi Xiong
- Beijing National Laboratory for Molecular Science Key Laboratory of Analytical Chemistry for Living Biosystems Institute of Chemistry Chinese Academy of Sciences (CAS) Beijing 100190 China
- University of Chinese Academy of Sciences Beijing 100049 China
| | - Ping Yu
- Beijing National Laboratory for Molecular Science Key Laboratory of Analytical Chemistry for Living Biosystems Institute of Chemistry Chinese Academy of Sciences (CAS) Beijing 100190 China
- University of Chinese Academy of Sciences Beijing 100049 China
| | - Lanqun Mao
- Beijing National Laboratory for Molecular Science Key Laboratory of Analytical Chemistry for Living Biosystems Institute of Chemistry Chinese Academy of Sciences (CAS) Beijing 100190 China
- College of Chemistry Beijing Normal University Beijing 100875 China
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19
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Tseng AC, Sakata T. Direct Electrochemical Signaling in Organic Electrochemical Transistors Comprising High-Conductivity Double-Network Hydrogels. ACS APPLIED MATERIALS & INTERFACES 2022; 14:24729-24740. [PMID: 35587901 DOI: 10.1021/acsami.2c01779] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
In composite hydrogels, the high electrical performance of poly(3,4-ethylenedioxythiophene) complexed with poly(styrenesulfonate) (PEDOT:PSS) is integrated with complementary structural and electrochemical functions via a rationally designed poly(acrylamide) second network incorporating phenylboronic acid (PBA). Free-standing double-network hydrogels prepared by a simple one-pot radical polymerization exhibit state-of-the-art electrical conductivity (∼20 S cm-1 in phosphate buffered saline) while retaining a degree of hydration similar to that of biological soft tissues. Low resistance contacts to Au electrodes are formed via facile thermo-mechanical annealing and demonstrate stability over a month of continuous immersion, thus enabling hydrogels to serve as channels of organic electrochemical transistors (OECTs). Despite thicknesses of ∼100 μm, gating of hydrogel OECTs is efficient with transconductances gm ∼ 40 mS and on/off ratios of 103 in saturation mode operation, whereas sufficiently high conductivity enables linear mode operation (gm ∼ 1 mS at -10 mV drain bias). This drives a shift of sensing strategy toward detection of electrochemical signals originating within the bulky channel. A kinetic basis for glucose detection via diol esterification on PBA is identified as the coupling of PBA equilibrium to electrocatalyzed O2 reduction occurring on PEDOT in cathodic potentials. Hydrogel OECTs inherently amplify this direct electrochemical signal, demonstrating the viability of a new class of soft, structural biosensors.
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Affiliation(s)
- Alex C Tseng
- Department of Materials Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Toshiya Sakata
- Department of Materials Engineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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20
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Zare Bidoky F, Frisbie CD. Sub-3 V, MHz-Class Electrolyte-Gated Transistors and Inverters. ACS APPLIED MATERIALS & INTERFACES 2022; 14:21295-21300. [PMID: 35476913 DOI: 10.1021/acsami.2c01585] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Electrolyte-gated transistors (EGTs) have emerging applications in physiological recording, neuromorphic computing, sensing, and flexible printed electronics. A challenge for these devices is their slow switching speed, which has several causes. Here, we report the fabrication and characterization of n-type ZnO-based EGTs with signal propagation delays as short as 70 ns. Propagation delays are assessed in dynamically operating inverters and five-stage ring oscillators as a function of channel dimensions and supply voltages up to 3 V. Substantial decreases in switching time are realized by minimizing parasitic resistances and capacitances that are associated with the electrolyte in these devices. Stable switching at 1-10 MHz is achieved in individual inverter stages with 10-40 μm channel lengths, and analysis suggests that further improvements are possible.
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Affiliation(s)
- Fazel Zare Bidoky
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
- DuPont Electronics and Industrial, Emerging Technologies, Experimental Station, 200 Powder Mill Road, Wilmington, Delaware 19803, United States
| | - C Daniel Frisbie
- Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Avenue SE, Minneapolis, Minnesota 55455, United States
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21
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Paudel PR, Skowrons M, Dahal D, Radha Krishnan RK, Lüssem B. The Transient Response of Organic Electrochemical Transistors. ADVANCED THEORY AND SIMULATIONS 2022. [DOI: 10.1002/adts.202100563] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
| | | | - Drona Dahal
- Department of Physics Kent State University Kent OH 44242 USA
| | | | - Björn Lüssem
- Department of Physics Kent State University Kent OH 44242 USA
- Institut for Microsensors, Microactuators, and Microsystems (IMSAS) University of Bremen Otto‐Hahn‐Allee 1 Bremen 28359 Germany
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22
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Kim Y, Kim G, Ding B, Jeong D, Lee I, Park S, Kim BJ, McCulloch I, Heeney M, Yoon MH. High-Current-Density Organic Electrochemical Diodes Enabled by Asymmetric Active Layer Design. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2107355. [PMID: 34852181 DOI: 10.1002/adma.202107355] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 11/12/2021] [Indexed: 06/13/2023]
Abstract
Owing to their outstanding electrical/electrochemical performance, operational stability, mechanical flexibility, and decent biocompatibility, organic mixed ionic-electronic conductors have shown great potential as implantable electrodes for neural recording/stimulation and as active channels for signal switching/amplifying transistors. Nonetheless, no studies exist on a general design rule for high-performance electrochemical diodes, which are essential for highly functional circuit architectures. In this work, generalizable electrochemical diodes with a very high current density over 30 kA cm-2 are designed by introducing an asymmetric active layer based on organic mixed ionic-electronic conductors. The underlying mechanism on polarity-sensitive balanced ionic doping/dedoping is elucidated by numerical device analysis and in operando spectroelectrochemical potential mapping, while the general material requirements for electrochemical diode operation are deduced using various types of conjugated polymers. In parallel, analog signal rectification and digital logic processing circuits are successfully demonstrated to show the broad impact of circuits incorporating organic electrochemical diodes. It is expected that organic electrochemical diodes will play vital roles in realizing multifunctional soft bioelectronic circuitry in combination with organic electrochemical transistors.
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Affiliation(s)
- Youngseok Kim
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
| | - Gunwoo Kim
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
| | - Bowen Ding
- Department of Chemistry and Centre for Processable Electronics, Imperial College London, London, W12 0BZ, UK
| | - Dahyun Jeong
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea
| | - Inho Lee
- Department of Electrical and Computer Engineering, Ajou University, Suwon, 16499, Republic of Korea
| | - Sungjun Park
- Department of Electrical and Computer Engineering, Ajou University, Suwon, 16499, Republic of Korea
| | - Bumjoon J Kim
- Department of Chemical and Biomolecular Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea
| | - Iain McCulloch
- KAUST Solar Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal, 23955-6900, Saudi Arabia
- Department of Chemistry, University of Oxford, Oxford, OX1 3TA, UK
| | - Martin Heeney
- Department of Chemistry and Centre for Processable Electronics, Imperial College London, London, W12 0BZ, UK
| | - Myung-Han Yoon
- School of Materials Science and Engineering, Gwangju Institute of Science and Technology, Gwangju, 61005, Republic of Korea
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23
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Michela J, Claudia C, Federico B, Sara P, Filippo V, Nicola C, Manuele B, Davide C, Loreto F, Zappettini A. Real-time monitoring of Arundo donax response to saline stress through the application of in vivo sensing technology. Sci Rep 2021; 11:18598. [PMID: 34545124 PMCID: PMC8452760 DOI: 10.1038/s41598-021-97872-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Accepted: 08/24/2021] [Indexed: 11/09/2022] Open
Abstract
One of the main impacts of climate change on agriculture production is the dramatic increase of saline (Na+) content in substrate, that will impair crop performance and productivity. Here we demonstrate how the application of smart technologies such as an in vivo sensor, termed bioristor, allows to continuously monitor in real-time the dynamic changes of ion concentration in the sap of Arundo donax L. (common name giant reed or giant cane), when exposed to a progressive salinity stress. Data collected in vivo by bioristor sensors inserted at two different heights into A. donax stems enabled us to detect the early phases of stress response upon increasing salinity. Indeed, the continuous time-series of data recorded by the bioristor returned a specific signal which correlated with Na+ content in leaves of Na-stressed plants, opening a new perspective for its application as a tool for in vivo plant phenotyping and selection of genotypes more suitable for the exploitation of saline soils.
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Affiliation(s)
- Janni Michela
- National Research Council of Italy, Institute of Materials for Electronics and Magnetism (IMEM), National Research Council (CNR), Parco Area delle Scienze 37/A, 43124, Parma, Italy. .,National Research Council of Italy, Institute of Bioscience and Bioresources (IBBR), National Research Council (CNR), Via Amendola 165/A, 70126, Bari, Italy.
| | - Cocozza Claudia
- Department of Agriculture, Food, Environment and Forestry (DAGRI), University of Florence, via San Bonaventura 13, 50145, Florence, Italy.
| | - Brilli Federico
- National Research Council of Italy, Institute for the Sustainable Plant Protection (CNR - IPSP), Via Madonna del Piano 10, 50019, Sesto Fiorentino, Italy
| | - Pignattelli Sara
- National Research Council of Italy, Institute for the Sustainable Plant Protection (CNR - IPSP), Via Madonna del Piano 10, 50019, Sesto Fiorentino, Italy.,Laboratory of Environmental and Life Sciences, University of Nova Gorica, Vipavska cesta 13, 5000, Rožna Dolina, Nova Gorica, Slovenia
| | - Vurro Filippo
- National Research Council of Italy, Institute of Materials for Electronics and Magnetism (IMEM), National Research Council (CNR), Parco Area delle Scienze 37/A, 43124, Parma, Italy
| | - Coppede Nicola
- National Research Council of Italy, Institute of Materials for Electronics and Magnetism (IMEM), National Research Council (CNR), Parco Area delle Scienze 37/A, 43124, Parma, Italy
| | - Bettelli Manuele
- National Research Council of Italy, Institute of Materials for Electronics and Magnetism (IMEM), National Research Council (CNR), Parco Area delle Scienze 37/A, 43124, Parma, Italy
| | - Calestani Davide
- National Research Council of Italy, Institute of Materials for Electronics and Magnetism (IMEM), National Research Council (CNR), Parco Area delle Scienze 37/A, 43124, Parma, Italy
| | - Francesco Loreto
- National Research Council of Italy - Department of Biology, Agriculture and Food Sciences, (CNR-DISBA), P. Le Aldo Moro, 00185, Roma, Italy.,Department of Biology, University of Naples Federico II, Naples, Italy
| | - Andrea Zappettini
- National Research Council of Italy, Institute of Materials for Electronics and Magnetism (IMEM), National Research Council (CNR), Parco Area delle Scienze 37/A, 43124, Parma, Italy
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24
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Ferro LMM, Merces L, de Camargo DHS, Bof Bufon CC. Ultrahigh-Gain Organic Electrochemical Transistor Chemosensors Based on Self-Curled Nanomembranes. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2021; 33:e2101518. [PMID: 34061409 DOI: 10.1002/adma.202101518] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 03/31/2021] [Indexed: 06/12/2023]
Abstract
Organic electrochemical transistors (OECTs) are technologically relevant devices presenting high susceptibility to physical stimulus, chemical functionalization, and shape changes-jointly to versatility and low production costs. The OECT capability of liquid-gating addresses both electrochemical sensing and signal amplification within a single integrated device unit. However, given the organic semiconductor time-consuming doping process and their usual low field-effect mobility, OECTs are frequently considered low-end category devices. Toward high-performance OECTs, microtubular electrochemical devices based on strain-engineering are presented here by taking advantage of the exclusive shape features of self-curled nanomembranes. Such novel OECTs outperform the state-of-the-art organic liquid-gated transistors, reaching lower operating voltage, improved ion doping, and a signal amplification with a >104 intrinsic gain. The multipurpose OECT concept is validated with different electrolytes and distinct nanometer-thick molecular films, namely, phthalocyanine and thiophene derivatives. The OECTs are also applied as transducers to detect a biomarker related to neurological diseases, the neurotransmitter dopamine. The self-curled OECTs update the premises of electrochemical energy conversion in liquid-gated transistors, yielding a substantial performance improvement and new chemical sensing capabilities within picoliter sampling volumes.
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Affiliation(s)
- Letícia M M Ferro
- Brazilian Nanotechnology National Laboratory (LNNano), Brazilian Center for Research in Energy and Materials (CNPEM), Giuseppe Máximo Scolfaro 10000, Polo II de Alta Tecnologia, Campinas, 13083-100, Brazil
- Institute of Chemistry (IQ), University of Campinas (UNICAMP), Cidade Universitária "Zeferino Vaz", Campinas, 13083-970, Brazil
| | - Leandro Merces
- Brazilian Nanotechnology National Laboratory (LNNano), Brazilian Center for Research in Energy and Materials (CNPEM), Giuseppe Máximo Scolfaro 10000, Polo II de Alta Tecnologia, Campinas, 13083-100, Brazil
| | - Davi H S de Camargo
- Brazilian Nanotechnology National Laboratory (LNNano), Brazilian Center for Research in Energy and Materials (CNPEM), Giuseppe Máximo Scolfaro 10000, Polo II de Alta Tecnologia, Campinas, 13083-100, Brazil
| | - Carlos C Bof Bufon
- Brazilian Nanotechnology National Laboratory (LNNano), Brazilian Center for Research in Energy and Materials (CNPEM), Giuseppe Máximo Scolfaro 10000, Polo II de Alta Tecnologia, Campinas, 13083-100, Brazil
- Institute of Chemistry (IQ), University of Campinas (UNICAMP), Cidade Universitária "Zeferino Vaz", Campinas, 13083-970, Brazil
- Postgraduate Program in Materials Science and Technology (POSMAT), São Paulo State University (UNESP), Bauru, São Paulo, 17033-360, Brazil
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25
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Lee S, Cho YW, Lee J, Jung Y, Oh S, Sun J, Kim S, Joo Y. Nanofiber Channel Organic Electrochemical Transistors for Low-Power Neuromorphic Computing and Wide-Bandwidth Sensing Platforms. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2021; 8:2001544. [PMID: 34026425 PMCID: PMC8132164 DOI: 10.1002/advs.202001544] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 07/26/2020] [Indexed: 05/29/2023]
Abstract
Organic neuromorphic computing/sensing platforms are a promising concept for local monitoring and processing of biological signals in real time. Neuromorphic devices and sensors with low conductance for low power consumption and high conductance for low-impedance sensing are desired. However, it has been a struggle to find materials and fabrication methods that satisfy both of these properties simultaneously in a single substrate. Here, nanofiber channels with a self-formed ion-blocking layer are fabricated to create organic electrochemical transistors (OECTs) that can be tailored to achieve low-power neuromorphic computing and fast-response sensing by transferring different amounts of electrospun nanofibers to each device. With their nanofiber architecture, the OECTs exhibit a low switching energy of 113 fJ and operate within a wide bandwidth (cut-off frequency of 13.5 kHz), opening a new paradigm for energy-efficient neuromorphic computing/sensing platforms in a biological environment without the leakage of personal information.
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Affiliation(s)
- Sol‐Kyu Lee
- Department of Materials Science & EngineeringSeoul National UniversitySeoul151‐744Korea
| | - Young Woon Cho
- Department of Materials Science & EngineeringSeoul National UniversitySeoul151‐744Korea
| | - Jong‐Sung Lee
- Department of Materials Science & EngineeringSeoul National UniversitySeoul151‐744Korea
| | - Young‐Ran Jung
- Department of Materials Science & EngineeringSeoul National UniversitySeoul151‐744Korea
| | - Seung‐Hyun Oh
- Department of Materials Science & EngineeringSeoul National UniversitySeoul151‐744Korea
| | - Jeong‐Yun Sun
- Department of Materials Science & EngineeringSeoul National UniversitySeoul151‐744Korea
| | - SangBum Kim
- Department of Materials Science & EngineeringSeoul National UniversitySeoul151‐744Korea
| | - Young‐Chang Joo
- Department of Materials Science & EngineeringSeoul National UniversitySeoul151‐744Korea
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26
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Organic Electrochemical Transistors (OECTs) Toward Flexible and Wearable Bioelectronics. Molecules 2020; 25:molecules25225288. [PMID: 33202778 PMCID: PMC7698176 DOI: 10.3390/molecules25225288] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2020] [Revised: 11/02/2020] [Accepted: 11/10/2020] [Indexed: 11/17/2022] Open
Abstract
Organic electronics have emerged as a fascinating area of research and technology in the past two decades and are anticipated to replace classic inorganic semiconductors in many applications. Research on organic light-emitting diodes, organic photovoltaics, and organic thin-film transistors is already in an advanced stage, and the derived devices are commercially available. A more recent case is the organic electrochemical transistors (OECTs), whose core component is a conductive polymer in contact with ions and solvent molecules of an electrolyte, thus allowing it to simultaneously regulate electron and ion transport. OECTs are very effective in ion-to-electron transduction and sensor signal amplification. The use of synthetically tunable, biocompatible, and depositable organic materials in OECTs makes them specially interesting for biological applications and printable devices. In this review, we provide an overview of the history of OECTs, their physical characterization, and their operation mechanism. We analyze OECT performance improvements obtained by geometry design and active material selection (i.e., conductive polymers and small molecules) and conclude with their broad range of applications from biological sensors to wearable devices.
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27
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Schweicher G, Garbay G, Jouclas R, Vibert F, Devaux F, Geerts YH. Molecular Semiconductors for Logic Operations: Dead-End or Bright Future? ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e1905909. [PMID: 31965662 DOI: 10.1002/adma.201905909] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 11/18/2019] [Indexed: 05/26/2023]
Abstract
The field of organic electronics has been prolific in the last couple of years, leading to the design and synthesis of several molecular semiconductors presenting a mobility in excess of 10 cm2 V-1 s-1 . However, it is also started to recently falter, as a result of doubtful mobility extractions and reduced industrial interest. This critical review addresses the community of chemists and materials scientists to share with it a critical analysis of the best performing molecular semiconductors and of the inherent charge transport physics that takes place in them. The goal is to inspire chemists and materials scientists and to give them hope that the field of molecular semiconductors for logic operations is not engaged into a dead end. To the contrary, it offers plenty of research opportunities in materials chemistry.
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Affiliation(s)
- Guillaume Schweicher
- Laboratoire de chimie des polymères, Faculté des Sciences, Université Libre de Bruxelles (ULB) Boulevard du Triomphe, Brussels, 1050, Belgium
- Optoelectronics Group, Cavendish Laboratory, University of Cambridge, JJ Thomson Avenue, Cambridge, CB3 0HE, UK
| | - Guillaume Garbay
- Laboratoire de chimie des polymères, Faculté des Sciences, Université Libre de Bruxelles (ULB) Boulevard du Triomphe, Brussels, 1050, Belgium
| | - Rémy Jouclas
- Laboratoire de chimie des polymères, Faculté des Sciences, Université Libre de Bruxelles (ULB) Boulevard du Triomphe, Brussels, 1050, Belgium
| | - François Vibert
- Laboratoire de chimie des polymères, Faculté des Sciences, Université Libre de Bruxelles (ULB) Boulevard du Triomphe, Brussels, 1050, Belgium
| | - Félix Devaux
- Laboratoire de chimie des polymères, Faculté des Sciences, Université Libre de Bruxelles (ULB) Boulevard du Triomphe, Brussels, 1050, Belgium
| | - Yves H Geerts
- Laboratoire de chimie des polymères, Faculté des Sciences, Université Libre de Bruxelles (ULB) Boulevard du Triomphe, Brussels, 1050, Belgium
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28
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Mariani F, Conzuelo F, Cramer T, Gualandi I, Possanzini L, Tessarolo M, Fraboni B, Schuhmann W, Scavetta E. Microscopic Determination of Carrier Density and Mobility in Working Organic Electrochemical Transistors. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2019; 15:e1902534. [PMID: 31448569 DOI: 10.1002/smll.201902534] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/17/2019] [Revised: 07/27/2019] [Indexed: 05/10/2023]
Abstract
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.
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Affiliation(s)
- Federica Mariani
- Dipartimento di Chimica Industriale "Toso Montanari", Università di Bologna, Viale Risorgimento 4, 40136, Bologna, Italy
| | - Felipe Conzuelo
- Analytical Chemistry - Center for Electrochemical Sciences (CES), Faculty of Chemistry and Biochemistry, Ruhr University Bochum, Universitätsstraße 150, 44780, Bochum, Germany
| | - Tobias Cramer
- Dipartimento di Fisica e Astronomia, Università di Bologna, Viale Berti Pichat 6/2, 40127, Bologna, Italy
| | - Isacco Gualandi
- Dipartimento di Chimica Industriale "Toso Montanari", Università di Bologna, Viale Risorgimento 4, 40136, Bologna, Italy
| | - Luca Possanzini
- Dipartimento di Fisica e Astronomia, Università di Bologna, Viale Berti Pichat 6/2, 40127, Bologna, Italy
| | - Marta Tessarolo
- Dipartimento di Fisica e Astronomia, Università di Bologna, Viale Berti Pichat 6/2, 40127, Bologna, Italy
| | - Beatrice Fraboni
- Dipartimento di Fisica e Astronomia, Università di Bologna, Viale Berti Pichat 6/2, 40127, Bologna, Italy
| | - Wolfgang Schuhmann
- Analytical Chemistry - Center for Electrochemical Sciences (CES), Faculty of Chemistry and Biochemistry, Ruhr University Bochum, Universitätsstraße 150, 44780, Bochum, Germany
| | - Erika Scavetta
- Dipartimento di Chimica Industriale "Toso Montanari", Università di Bologna, Viale Risorgimento 4, 40136, Bologna, Italy
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29
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Wang C, Wang C, Huang Z, Xu S. Materials and Structures toward Soft Electronics. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1801368. [PMID: 30073715 DOI: 10.1002/adma.201801368] [Citation(s) in RCA: 233] [Impact Index Per Article: 33.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Revised: 05/14/2018] [Indexed: 05/21/2023]
Abstract
Soft electronics are intensively studied as the integration of electronics with dynamic nonplanar surfaces has become necessary. Here, a discussion of the strategies in materials innovation and structural design to build soft electronic devices and systems is provided. For each strategy, the presentation focuses on the fundamental materials science and mechanics, and example device applications are highlighted where possible. Finally, perspectives on the key challenges and future directions of this field are presented.
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Affiliation(s)
- Chunfeng Wang
- Department of Nanoengineering, University of California San Diego, La Jolla, CA, 92093, USA
- School of Materials Science and Engineering, National Engineering Research Center for Advanced Polymer Processing Technology, School of Physics and Engineering, Zhengzhou University, Zhengzhou, Henan, 450001, P. R. China
| | - Chonghe Wang
- Department of Nanoengineering, University of California San Diego, La Jolla, CA, 92093, USA
| | - Zhenlong Huang
- Department of Nanoengineering, University of California San Diego, La Jolla, CA, 92093, USA
- State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, Sichuan, 610054, P. R. China
| | - Sheng Xu
- Department of Nanoengineering, University of California San Diego, La Jolla, CA, 92093, USA
- Materials Science and Engineering Program, University of California San Diego, La Jolla, CA, 92093, USA
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30
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Gu X, Yeung SY, Chadda A, Poon ENY, Boheler KR, Hsing IM. Organic Electrochemical Transistor Arrays for In Vitro Electrophysiology Monitoring of 2D and 3D Cardiac Tissues. ACTA ACUST UNITED AC 2018; 3:e1800248. [DOI: 10.1002/adbi.201800248] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2018] [Revised: 10/26/2018] [Indexed: 12/12/2022]
Affiliation(s)
- Xi Gu
- Bioengineering Graduate Program; Department of Chemical and Biological Engineering; The Hong Kong University of Science and Technology; Hong Kong China
| | - Sin Yu Yeung
- Bioengineering Graduate Program; Department of Chemical and Biological Engineering; The Hong Kong University of Science and Technology; Hong Kong China
| | - Akriti Chadda
- Bioengineering Graduate Program; Department of Chemical and Biological Engineering; The Hong Kong University of Science and Technology; Hong Kong China
| | - Ellen Ngar Yun Poon
- The Stem Cell and Regenerative Consortium; The University of Hong Kong; Hong Kong China
| | - Kenneth R. Boheler
- The Stem Cell and Regenerative Consortium; The University of Hong Kong; Hong Kong China
- The Department of Biomedical Engineering; Johns Hopkins University; Baltimore MD 21205 USA
| | - I.-Ming Hsing
- Bioengineering Graduate Program; Department of Chemical and Biological Engineering; The Hong Kong University of Science and Technology; Hong Kong China
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31
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Wang N, Liu Y, Fu Y, Yan F. AC Measurements Using Organic Electrochemical Transistors for Accurate Sensing. ACS APPLIED MATERIALS & INTERFACES 2018; 10:25834-25840. [PMID: 28846372 DOI: 10.1021/acsami.7b07668] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/15/2023]
Abstract
Organic electrochemical transistors (OECTs) have been successfully employed for a variety of applications , especially chemical and biological sensing. Although the device response to analytes can be directly monitored by measuring steady-state channel currents of the devices, it is challenging to obtain stable signals with high signal-to-noise ratios. In this work, we developed a novel method for electrochemical sensing by measuring both the transconductance and the phase of the AC channel current for the first time. Then we successfully realized highly sensitive ion strength sensors and dopamine sensors based on the AC method. Our results indicate that the AC method is more sensitive than typical DC methods and can provide more stable data in sensing applications. Considering that the sensors can be conveniently integrated with AC circuits, this technology is expected to find broad applications in the future.
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Affiliation(s)
- Naixiang Wang
- Department of Applied Physics , The Hong Kong Polytechnic University , Hong Kong
| | - Yuzhe Liu
- Department of Applied Physics , The Hong Kong Polytechnic University , Hong Kong
| | - Ying Fu
- Department of Applied Physics , The Hong Kong Polytechnic University , Hong Kong
| | - Feng Yan
- Department of Applied Physics , The Hong Kong Polytechnic University , Hong Kong
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32
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Doris SE, Pierre A, Street RA. Dynamic and Tunable Threshold Voltage in Organic Electrochemical Transistors. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2018; 30:e1706757. [PMID: 29498110 DOI: 10.1002/adma.201706757] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2017] [Revised: 01/05/2018] [Indexed: 06/08/2023]
Abstract
In recent years, organic electrochemical transistors (OECTs) have found applications in chemical and biological sensing and interfacing, neuromorphic computing, digital logic, and printed electronics. However, the incorporation of OECTs in practical electronic circuits is limited by the relative lack of control over their threshold voltage, which is important for controlling the power consumption and noise margin in complementary and unipolar circuits. Here, the threshold voltage of OECTs is precisely tuned over a range of more than 1 V by chemically controlling the electrochemical potential at the gate electrode. This threshold voltage tunability is exploited to prepare inverters and amplifiers with improved noise margin and gain, respectively. By coupling the gate electrode with an electrochemical oscillator, single-transistor oscillators based on OECTs with dynamic time-varying threshold voltages are prepared. This work highlights the importance of electrochemistry at the gate electrode in determining the electrical properties of OECTs, and opens a path toward the system-level design of low-power OECT-based electronics.
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Affiliation(s)
- Sean E Doris
- Palo Alto Research Center-a Xerox Company, 3333 Coyote Hill Road, Palo Alto, CA, 94304, USA
| | - Adrien Pierre
- Palo Alto Research Center-a Xerox Company, 3333 Coyote Hill Road, Palo Alto, CA, 94304, USA
| | - Robert A Street
- Palo Alto Research Center-a Xerox Company, 3333 Coyote Hill Road, Palo Alto, CA, 94304, USA
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33
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Xu H, Zhu Q, Lv Y, Deng K, Deng Y, Li Q, Qi S, Chen W, Zhang H. Flexible and Highly Photosensitive Electrolyte-Gated Organic Transistors with Ionogel/Silver Nanowire Membranes. ACS APPLIED MATERIALS & INTERFACES 2017; 9:18134-18141. [PMID: 28488860 DOI: 10.1021/acsami.7b04470] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Flexible and low-voltage photosensors with high near-infrared (NIR) sensitivity are critical for realization of interacting humans with robots and environments by thermal imaging or night vision techniques. In this work, we for the first time develop an easy and cost-effective process to fabricate flexible and ultrathin electrolyte-gated organic phototransistors (EGOPTs) with high transparent nanocomposite membranes of high-conductivity silver nanowire (AgNW) networks and large-capacitance iontronic films. A high responsivity of 1.5 × 103 A·W1-, high sensitivity of 7.5 × 105, and 3 dB bandwidth of ∼100 Hz can be achieved at very low operational voltages. Experimental studies in temporal photoresponse characteristics reveal the device has a shorter photoresponse time at lower light intensity since strong interactions between photoexcited hole carriers and anions induce extra long-lived trap states. The devices, benefiting from fast and air-stable operations, provide the possibility of the organic photosensors for constructing cost-effective and smart optoelectronic systems in the future.
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Affiliation(s)
- Haihua Xu
- Department of Biomedical and Engineering, School of Medicine, ‡Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, and §National-Regional Key Technology Engineering Laboratory for Medical Ultrasound, Shenzhen University , Shenzhen 518060, China
| | - QingQing Zhu
- Department of Biomedical and Engineering, School of Medicine, ‡Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, and §National-Regional Key Technology Engineering Laboratory for Medical Ultrasound, Shenzhen University , Shenzhen 518060, China
| | - Ying Lv
- Department of Biomedical and Engineering, School of Medicine, ‡Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, and §National-Regional Key Technology Engineering Laboratory for Medical Ultrasound, Shenzhen University , Shenzhen 518060, China
| | - Kan Deng
- Department of Biomedical and Engineering, School of Medicine, ‡Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, and §National-Regional Key Technology Engineering Laboratory for Medical Ultrasound, Shenzhen University , Shenzhen 518060, China
| | - Yinghua Deng
- Department of Biomedical and Engineering, School of Medicine, ‡Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, and §National-Regional Key Technology Engineering Laboratory for Medical Ultrasound, Shenzhen University , Shenzhen 518060, China
| | - Qiaoliang Li
- Department of Biomedical and Engineering, School of Medicine, ‡Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, and §National-Regional Key Technology Engineering Laboratory for Medical Ultrasound, Shenzhen University , Shenzhen 518060, China
| | - Suwen Qi
- Department of Biomedical and Engineering, School of Medicine, ‡Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, and §National-Regional Key Technology Engineering Laboratory for Medical Ultrasound, Shenzhen University , Shenzhen 518060, China
| | - Wenwen Chen
- Department of Biomedical and Engineering, School of Medicine, ‡Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, and §National-Regional Key Technology Engineering Laboratory for Medical Ultrasound, Shenzhen University , Shenzhen 518060, China
| | - Huisheng Zhang
- Department of Biomedical and Engineering, School of Medicine, ‡Guangdong Key Laboratory for Biomedical Measurements and Ultrasound Imaging, and §National-Regional Key Technology Engineering Laboratory for Medical Ultrasound, Shenzhen University , Shenzhen 518060, China
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