21 results on '"Inal, Sahika"'
Search Results
2. Designing organic mixed conductors for electrochemical transistor applications
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Wang, Yazhou, Wustoni, Shofarul, Surgailis, Jokubas, Zhong, Yizhou, Koklu, Anil, and Inal, Sahika
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- 2024
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3. Revealing the effect of cobalt content and ligand exchange in the bimetallic Ni–Co MOF for stable supercapacitors with high energy density
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Raissa, Wulan Septiani, Ni Luh, Wustoni, Shofarul, Failamani, Fainan, Wehbe, Nimer, Eguchi, Miharu, Nara, Hiroki, Inal, Sahika, Suendo, Veinardi, and Yuliarto, Brian
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- 2024
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4. PNIPAM/PEDOT:PSS Hydrogels for Multifunctional Organic Electrochemical Transistors.
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Lopez‐Larrea, Naroa, Wustoni, Shofarul, Peñas, Mario Iván, Uribe, Johana, Dominguez‐Alfaro, Antonio, Gallastegui, Antonela, Inal, Sahika, and Mecerreyes, David
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POLY(ISOPROPYLACRYLAMIDE) ,DRUG monitoring ,CRITICAL temperature ,HUMAN body ,TRANSISTORS - Abstract
The development of multifunctional organic materials represents a vibrant area of research, with applications spanning from biosensing to drug delivery. This study shows the development of a multifunctional bioelectronic device suitable for prolonged temperature monitoring and drug delivery applications. The device relies on a conducting and thermo‐responsive hydrogel made of poly(3,4‐ethylenedioxythiophene) doped with poly(styrene sulfonate) (PEDOT:PSS) and poly(N‐isopropylacrylamide) (PNIPAM). This multifunctional hydrogel is 4D printable by Digital Light Processing (DLP) method and exhibits optimal biocompatibility. The hydrogel features a low critical solution temperature (LCST) ≈35 °C, above which its resistance changes dramatically due to the shrinkage it undergoes with temperature. The integration of PNIPAM/PEDOT hydrogel into an organic electrochemical transistor (OECT) as the gate electrode allows to generate a miniaturized bioelectronic device with a reversible response to temperature variations between 25 to 45 °C, along with high sensitivity of 0.05 °C−1. Furthermore, the PNIPAM/PEDOT hydrogel demonstrates its utility in drug delivery, achieving an Insulin‐FITC release rate of 82 ± 4% at 37 °C, mimicking human body conditions. The hydrogel's functionality to store and release the insulin does not compromise its thermo‐responsivity and the overall performance of the OECT. This multifunctional OECT opens new avenues for the development of customizable and personalized sensing and drug‐delivery systems. [ABSTRACT FROM AUTHOR]
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- 2024
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5. Reconfiguration of organic electrochemical transistors for high-accuracy potentiometric sensing.
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Salvigni, Luca, Nayak, Prem Depan, Koklu, Anil, Arcangeli, Danilo, Uribe, Johana, Hama, Adel, Silva, Raphaela, Hidalgo Castillo, Tania Cecilia, Griggs, Sophie, Marks, Adam, McCulloch, Iain, and Inal, Sahika
- Abstract
Organic electrochemical transistors have emerged as a promising alternative to traditional 2/3 electrode setups for sensing applications, offering in-situ transduction, electrochemical amplification, and noise reduction. Several of these devices are designed to detect potentiometric-derived signals. However, potentiometric sensing should be performed under open circuit potential conditions, allowing the system to reach thermodynamic equilibrium. This criterion is not met by conventional organic electrochemical transistors, where voltages or currents are directly applied to the sensing interface, that is, the gate electrode. In this work, we introduce an organic electrochemical transistor sensing configuration called the potentiometric‑OECT (pOECT), which maintains the sensing electrode under open circuit potential conditions. The pOECT exhibits a higher response than the 2-electrode setup and offers greater accuracy, response, and stability compared to conventional organic electrochemical transistors. Additionally, it allows for the implementation of high-impedance electrodes as gate/sensing surfaces, all without compromising the overall device size.The translation of transistor-based sensor technologies is limited by unreliable potentiometric sensing. Here, the authors propose a transistor configuration that eliminates the measurement inaccuracies associated with electrochemical transistor-based potentiometric sensors. [ABSTRACT FROM AUTHOR]
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- 2024
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6. Enhancing the Maturation of Human Pluripotent Stem Cell-Derived Cardiomyocytes with an n-Type Organic Semiconductor Coating
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Ramirez-Calderon, Gustavo, primary, Saleh, Abdulelah, additional, Hidalgo Castillo, Tania Cecilia, additional, Druet, Victor, additional, Almarhoon, Bayan, additional, Almulla, Latifah, additional, Adamo, Antonio, additional, and Inal, Sahika, additional
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- 2024
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7. The Role Of Side Chains and Hydration on Mixed Charge Transport in N‐Type Polymer Films
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Surgailis, Jokūbas, primary, Flagg, Lucas Q., additional, Richter, Lee J., additional, Druet, Victor, additional, Griggs, Sophie, additional, Wu, Xiaocui, additional, Moro, Stefania, additional, Ohayon, David, additional, Kousseff, Christina J., additional, Marks, Adam, additional, Maria, Iuliana P., additional, Chen, Hu, additional, Moser, Maximilian, additional, Costantini, Giovanni, additional, McCulloch, Iain, additional, and Inal, Sahika, additional
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- 2024
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8. A Performance Comparison Between Organic Electrochemical Transistor and Electrode Configurations for Enzymatic Sensing
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Saleh, Abdulelah, primary, Wustoni, Shofarul, additional, Salvigni, Luca, additional, Koklu, Anil, additional, Druet, Victor, additional, Surgailis, Jokubas, additional, Nayak, Prem D., additional, and Inal, Sahika, additional
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- 2024
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9. Eutectogels as a Semisolid Electrolyte for Organic Electrochemical Transistors
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Zhong, Yizhou, primary, Lopez-Larrea, Naroa, additional, Alvarez-Tirado, Marta, additional, Casado, Nerea, additional, Koklu, Anil, additional, Marks, Adam, additional, Moser, Maximilian, additional, McCulloch, Iain, additional, Mecerreyes, David, additional, and Inal, Sahika, additional
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- 2024
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10. Single-Component Electroactive Polymer Architectures for Non-Enzymatic Glucose Sensing
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Kousseff, Christina J. (author), Wustoni, Shofarul (author), Silva, Raphaela K.S. (author), Lifer, Ariel (author), Savva, A. (author), Frey, Gitti L. (author), Inal, Sahika (author), Nielsen, Christian B. (author), Kousseff, Christina J. (author), Wustoni, Shofarul (author), Silva, Raphaela K.S. (author), Lifer, Ariel (author), Savva, A. (author), Frey, Gitti L. (author), Inal, Sahika (author), and Nielsen, Christian B. (author)
- Abstract
Organic mixed ionic-electronic conductors (OMIECs) have emerged as promising materials for biological sensing, owing to their electrochemical activity, stability in an aqueous environment, and biocompatibility. Yet, OMIEC-based sensors rely predominantly on the use of composite matrices to enable stimuli-responsive functionality, which can exhibit issues with intercomponent interfacing. In this study, an approach is presented for non-enzymatic glucose detection by harnessing a newly synthesized functionalized monomer, EDOT-PBA. This monomer integrates electrically conducting and receptor moieties within a single organic component, obviating the need for complex composite preparation. By engineering the conditions for electrodeposition, two distinct polymer film architectures are developed: pristine PEDOT-PBA and molecularly imprinted PEDOT-PBA. Both architectures demonstrated proficient glucose binding and signal transduction capabilities. Notably, the molecularly imprinted polymer (MIP) architecture demonstrated faster stabilization upon glucose uptake while it also enabled a lower limit of detection, lower standard deviation, and a broader linear range in the sensor output signal compared to its non-imprinted counterpart. This material design not only provides a robust and efficient platform for glucose detection but also offers a blueprint for developing selective sensors for a diverse array of target molecules, by tuning the receptor units correspondingly., Bio-Electronics
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- 2024
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11. Single‐Component Electroactive Polymer Architectures for Non‐Enzymatic Glucose Sensing.
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Kousseff, Christina J., Wustoni, Shofarul, Silva, Raphaela K. S., Lifer, Ariel, Savva, Achilleas, Frey, Gitti L., Inal, Sahika, and Nielsen, Christian B.
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CONDUCTING polymers ,IMPRINTED polymers ,GLUCOSE ,POLYMER films ,SENSOR arrays ,BIOMATERIALS - Abstract
Organic mixed ionic‐electronic conductors (OMIECs) have emerged as promising materials for biological sensing, owing to their electrochemical activity, stability in an aqueous environment, and biocompatibility. Yet, OMIEC‐based sensors rely predominantly on the use of composite matrices to enable stimuli‐responsive functionality, which can exhibit issues with intercomponent interfacing. In this study, an approach is presented for non‐enzymatic glucose detection by harnessing a newly synthesized functionalized monomer, EDOT‐PBA. This monomer integrates electrically conducting and receptor moieties within a single organic component, obviating the need for complex composite preparation. By engineering the conditions for electrodeposition, two distinct polymer film architectures are developed: pristine PEDOT‐PBA and molecularly imprinted PEDOT‐PBA. Both architectures demonstrated proficient glucose binding and signal transduction capabilities. Notably, the molecularly imprinted polymer (MIP) architecture demonstrated faster stabilization upon glucose uptake while it also enabled a lower limit of detection, lower standard deviation, and a broader linear range in the sensor output signal compared to its non‐imprinted counterpart. This material design not only provides a robust and efficient platform for glucose detection but also offers a blueprint for developing selective sensors for a diverse array of target molecules, by tuning the receptor units correspondingly. [ABSTRACT FROM AUTHOR]
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- 2024
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12. SpyDirect: A Novel Biofunctionalization Method for High Stability and Longevity of Electronic Biosensors.
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Guo, Keying, Grünberg, Raik, Ren, Yuxiang, Chang, Tianrui, Wustoni, Shofarul, Strnad, Ondrej, Koklu, Anil, Díaz‐Galicia, Escarlet, Agudelo, Jessica Parrado, Druet, Victor, Castillo, Tania Cecilia Hidalgo, Moser, Maximilian, Ohayon, David, Hama, Adel, Dada, Ashraf, McCulloch, Iain, Viola, Ivan, Arold, Stefan T., and Inal, Sahika
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CHEMICAL detectors ,BIOSENSORS ,BIOELECTRONICS ,CHIMERIC proteins ,LONGEVITY ,GOLD electrodes ,GLOBULAR proteins - Abstract
Electronic immunosensors are indispensable tools for diagnostics, particularly in scenarios demanding immediate results. Conventionally, these sensors rely on the chemical immobilization of antibodies onto electrodes. However, globular proteins tend to adsorb and unfold on these surfaces. Therefore, self‐assembled monolayers (SAMs) of thiolated alkyl molecules are commonly used for indirect gold–antibody coupling. Here, a limitation associated with SAMs is revealed, wherein they curtail the longevity of protein sensors, particularly when integrated into the state‐of‐the‐art transducer of organic bioelectronics—the organic electrochemical transistor. The SpyDirect method is introduced, generating an ultrahigh‐density array of oriented nanobody receptors stably linked to the gold electrode without any SAMs. It is accomplished by directly coupling cysteine‐terminated and orientation‐optimized spyTag peptides, onto which nanobody‐spyCatcher fusion proteins are autocatalytically attached, yielding a dense and uniform biorecognition layer. The structure‐guided design optimizes the conformation and packing of flexibly tethered nanobodies. This biolayer enhances shelf‐life and reduces background noise in various complex media. SpyDirect functionalization is faster and easier than SAM‐based methods and does not necessitate organic solvents, rendering the sensors eco‐friendly, accessible, and amenable to scalability. SpyDirect represents a broadly applicable biofunctionalization method for enhancing the cost‐effectiveness, sustainability, and longevity of electronic biosensors, all without compromising sensitivity. [ABSTRACT FROM AUTHOR]
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- 2024
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13. N-Type polymeric mixed conductors for all-in-one aqueous electrolyte gated photoelectrochemical transistors.
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Almulla, Latifah, Druet, Victor, E. Petoukhoff, Christopher, Shan, Wentao, Alshehri, Nisreen, Griggs, Sophie, Wang, Yazhou, Alsufyani, Maryam, Yue, Wan, McCulloch, Iain, Laquai, Frédéric, and Inal, Sahika
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- 2024
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14. Flexible switch matrix addressable electrode arrays with organic electrochemical transistor and pn diode technology
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Uguz, Ilke, primary, Ohayon, David, additional, Arslan, Volkan, additional, Sheelamanthula, Rajendar, additional, Griggs, Sophie, additional, Hama, Adel, additional, Stanton, John William, additional, McCulloch, Iain, additional, Inal, Sahika, additional, and Shepard, Kenneth L., additional
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- 2024
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15. Acceptor Functionalization via Green Chemistry Enables High‐Performance n‐Type Organic Electrochemical Transistors for Biosensing, Memory Applications.
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Wang, Yazhou, Koklu, Anil, Zhong, Yizhou, Chang, Tianrui, Guo, Keying, Zhao, Chao, Castillo, Tania Cecilia Hidalgo, Bu, Zhonggao, Xiao, Chengyi, Yue, Wan, Ma, Wei, and Inal, Sahika
- Subjects
SUSTAINABLE chemistry ,CONJUGATED polymers ,POLYMERS ,FRONTIER orbitals ,ORGANIC semiconductors ,N-type semiconductors ,TRANSISTORS - Abstract
The organic electrochemical transistor (OECT) is one of the most versatile building blocks within the bioelectronics device toolbox. While p‐type organic semiconductors have progressed as OECT channel materials, only a few n‐type semiconductors have been reported, precluding the development of advanced sensor‐integrated OECT‐based complementary circuits. Herein, green aldol polymerization is uses to synthesize lactone‐based n‐type conjugated polymers. Fluorination of the lactone‐based acceptor endows a fully locked backbone with a low‐lying lowest unoccupied molecular orbital, facilitating efficient ionic‐to‐electronic charge coupling. The resulting polymer has a record‐high n‐type OECT performance with a high product of mobility and capacitance (µC* = 108 F cm−1 V−1 s−1), excellent mobility (0.912 cm2 V−1 s−1), low threshold voltage (0.02 V), and fast switching speed (τON, τOFF = 336 µs,108 µs). This work demonstrates two types of device architectures and applications enabled by the high performance of this n‐type OECT, i.e., an artificial synapse and a complementary amplifier for detecting α‐synuclein, a potential biomarker of Parkinson's disease. This study shows that materials that enable high gain and fast speed n‐type OECTs can be developed via a green polymerization route, and the diverse form factors that these devices take promise for exploration of other application areas. [ABSTRACT FROM AUTHOR]
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- 2024
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16. Material Design and Characterization of Conducting Polymer-Based Supercapacitors.
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Wustoni, Shofarul, Ohayon, David, Hermawan, Angga, Nuruddin, Ahmad, Inal, Sahika, Indartono, Yuli Setyo, and Yuliarto, Brian
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ENERGY storage ,CONDUCTING polymers ,TECHNOLOGICAL innovations ,SUPERCAPACITORS ,HYBRID electric vehicles ,ELECTRONIC equipment ,POLYMER electrodes - Abstract
The recent emerging technologies (e.g., hybrid vehicles and wearable electronic devices) laid down critical and stringent considerations for their power sources. In this regard, supercapacitors (SCs) have become an attractive energy storage solution, thanks to their superior power density and stability over batteries. The continuous development of SCs is an active field of research toward practical application and commercialization. Yet, finding electrode materials with high capacitance, excellent cycle-life, and mechanical stability is of major interest to exceed the current state-of-the-art SCs. The unique set of features of conducting polymers (CPs), including remarkable electrochemical properties, tunable synthesis, solution-processable capabilities, and mechanical flexibility, promotes them at the forefront of materials for SCs electrodes. This review provides a comprehensive summary of CP-based SCs technology. We first start with a brief overview of CPs' unique properties and the principal synthetic methods that enable innovative fabrication. Then, a compact summary of the electrochemical and physicochemical characterization techniques is presented to assess the quality and mechanism of CP-based SCs. We limit our discussion to the published works in the last ten years. Finally, we highlight several research trends, key challenges, and opportunities of CP-based SCs for future research and development. [ABSTRACT FROM AUTHOR]
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- 2024
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17. Electrochemical Performance of Biocompatible TiC Films Deposited through Nonreactive RF Magnetron Sputtering for Neural Interfacing
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Sait, Roaa, Al-Jawhari, Hala, Ganash, Aisha, Wustoni, Shofarul, Chen, Long, Hedhili, Mohamed Nejib, Wehbe, Nimer, Hussein, Deema, Alhowity, Alazouf, Baeesa, Saleh, Bangash, Mohammed, Abuzenadah, Adel, Inal, Sahika, and Cross, Richard
- Abstract
The efficacy of neural electrode stimulation and recording hinges significantly on the choice of a neural electrode interface material. Transition metal carbides (TMCs), particularly titanium carbide (TiC), have demonstrated exceptional chemical stability and high electrical conductivity. Yet, the fabrication of TiC thin films and their potential application as neural electrode interfaces remains relatively unexplored. Herein, we present a systematic examination of TiC thin films synthesized through nonreactive radio frequency (RF) magnetron sputtering. TiC films were optimized toward high areal capacitance, low impedance, and stable electrochemical cyclability. We varied the RF power and deposition pressure to pinpoint the optimal properties, focusing on the deposition rate, surface roughness, crystallinity, and elemental composition to achieve high areal capacitance and low impedance. The best-performing TiC film showed an areal capacitance of 475 μF/cm2with a capacitance retention of 93% after 5000 cycles. In addition, the electrochemical performance of the optimum film under varying scanning rates demonstrated a stable electrochemical performance even under dynamic and fast-changing stimulation conditions. Furthermore, the in vitro cell culture for 3 weeks revealed excellent biocompatibility, promoting cell growth compared with a control substrate. This work presents a novel contribution, highlighting the potential of sputtered TiC thin films as robust neural electrode interface materials.
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- 2024
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18. High-Performance Organic Electrochemical Transistors Based on Conjugated Polyelectrolyte Copolymers
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Schmode, Philip, Ohayon, David, Reichstein, Paul M., Savva, Achilleas, Inal, Sahika, and Thelakkat, Mukundan
- Abstract
A new generation of polythiophene-based polyelectrolytes is reported to address fundamental issues in organic electrochemical transistors (OECTs). In such devices, the semiconductor must be able to transport and store ions and possess simultaneously a very high electronic mobility. For this, the ion-conducting 6-(thiophen-3-yl) hexane-1-sulfonate tetramethylammonium monomer (THS–TMA+) is copolymerized with the hole-conducting 3-hexylthiophene (3HT) to obtain copolymers, PTHS–TMA+-co-P3HT 1–3with a gradient architecture. The copolymers having up to 50 mol % 3HT content are easily oxidizable and are crystalline. Consequently, for the copolymers, a higher stability in water is achieved, thus reducing the amount of cross-linker needed to stabilize the film. Furthermore, OECTs using copolymers with 75 and 50 mol % of PTHS–TMA+content exhibit 2–3 orders of magnitude higher ON/OFF ratio and an extremely lower threshold voltage (−0.15 V) compared to PTHS–TMA+. Additionally, high volumetric capacitance (C* > 100 F/cm3) is achieved, indicating that the ion transport is not hampered by the hydrophobic 3HT up to 50 mol %, for which a very high OECT hole mobility of 0.017 cm2/(V s) is also achieved. Thus, the concept of copolymerization to combine both ionic and electronic charge transport in an organic mixed conductor offers an elegant approach to obtain high-performance OECT materials.
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- 2024
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19. Interactions of Catalytic Enzymes with n-Type Polymers for High-Performance Metabolite Sensors
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Ohayon, David, Renn, Dominik, Wustoni, Shofarul, Guo, Keying, Druet, Victor, Hama, Adel, Chen, Xingxing, Maria, Iuliana Petruta, Singh, Saumya, Griggs, Sophie, Schroeder, Bob C., Rueping, Magnus, McCulloch, Iain, and Inal, Sahika
- Abstract
The tight regulation of the glucose concentration in the body is crucial for balanced physiological function. We developed an electrochemical transistor comprising an n-type conjugated polymer film in contact with a catalytic enzyme for sensitive and selective glucose detection in bodily fluids. Despite the promise of these sensors, the property of the polymer that led to such high performance has remained unknown, with charge transport being the only characteristic under focus. Here, we studied the impact of the polymer chemical structure on film surface properties and enzyme adsorption behavior using a combination of physiochemical characterization methods and correlated our findings with the resulting sensor performance. We developed five n-type polymers bearing the same backbone with side chains differing in polarity and charge. We found that the nature of the side chains modulated the film surface properties, dictating the extent of interactions between the enzyme and the polymer film. Quartz crystal microbalance with dissipation monitoring studies showed that hydrophobic surfaces retained more enzymes in a densely packed arrangement, while hydrophilic surfaces captured fewer enzymes in a flattened conformation. X-ray photoelectron spectroscopy analysis of the surfaces revealed strong interactions of the enzyme with the glycolated side chains of the polymers, which improved for linear side chains compared to those for branched ones. We probed the alterations in the enzyme structure upon adsorption using circular dichroism, which suggested protein denaturation on hydrophobic surfaces. Our study concludes that a negatively charged, smooth, and hydrophilic film surface provides the best environment for enzyme adsorption with desired mass and conformation, maximizing the sensor performance. This knowledge will guide synthetic work aiming to establish close interactions between proteins and electronic materials, which is crucial for developing high-performance enzymatic metabolite biosensors and biocatalytic charge-conversion devices.
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- 2024
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20. Complementary integration of organic electrochemical transistors for front-end amplifier circuits of flexible neural implants.
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Uguz, Ilke, Ohayon, David, Yilmaz, Sinan, Griggs, Sophie, Sheelamanthula, Rajendar, Fabbri, Jason D., McCulloch, Iain, Inal, Sahika, and Shepard, Kenneth L.
- Subjects
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NEURAL circuitry , *FLEXIBLE printed circuits , *TRANSISTORS , *MICROMETERS - Abstract
The ability to amplify, translate, and process small ionic potential fluctuations of neural processes directly at the recording site is essential to improve the performance of neural implants. Organic front-end analog electronics are ideal for this application, allowing for minimally invasive amplifiers owing to their tissue-like mechanical properties. Here, we demonstrate fully organic complementary circuits by pairing depletion-and enhancement-mode p-and n-type organic electrochemical transistors (OECTs). With precise geometry tuning and a vertical device architecture, we achieve overlapping output characteristics and integrate them into amplifiers with single neuronal dimensions (20 micrometers). Amplifiers with combined p-and n-OECTs result in voltage-to-voltage amplification with a gain of >30 decibels. We also leverage depletion and enhancement-mode p-OECTs with matching characteristics to demonstrate a differential recording capability with high common mode rejection rate (>60 decibels). Integrating OECT-based front-end amplifiers into a flexible shank form factor enables single-neuron recording in the mouse cortex with on-site filtering and amplification. [ABSTRACT FROM AUTHOR]
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- 2024
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21. The Effect of Organic Semiconductor Electron Affinity on Preventing Parasitic Oxidation Reactions Limiting Performance of n-Type Organic Electrochemical Transistors.
- Author
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Alsufyani M, Moss B, Tait CE, Myers WK, Shahi M, Stewart K, Zhao X, Rashid RB, Meli D, Wu R, Paulsen BD, Thorley K, Lin Y, Combe C, Kniebe-Evans C, Inal S, Jeong SY, Woo HY, Ritchie G, Kim JS, Rivnay J, Paterson A, Durrant JR, and McCulloch I
- Abstract
A key challenge in the development of organic mixed ionic-electronic conducting materials (OMIEC) for high performance electrochemical transistors is their stable performance in ambient. When operating in aqueous electrolyte, potential reactions of the electrochemically injected electrons with air and water could hinder their persistence, leading to a reduction in charge transport. Here, the impact of deepening the LUMO energy level of a series of electron-transporting semiconducting polymers is evaluated, and subsequently rendering the most common oxidation processes of electron polarons thermodynamically unfavorable, on organic electrochemical transistors (OECTs) performance. Employing time resolved spectroelectrochemistry with three analogous polymers having varying electron affinities (EA), it is found that an EA below the thermodynamic threshold for oxidation of its electron polarons by oxygen significantly improves electron transport and lifetime in air. A polymer with a sufficiently large EA and subsequent thermodynamically unfavorable oxidation of electron polarons is reported, which is used as the semiconducting layer in an OECT, in its neutral and N-DMBI doped form, resulting in an excellent and air-stable OECT performance. These results show a general design methodology to avoid detrimental parasitic reactions under ambient conditions, and the benefits that arise in electrical performance., (© 2024 The Author(s). Advanced Materials published by Wiley‐VCH GmbH.)
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- 2024
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