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Sato D, Shima H, Matsuo T, Yonezawa M, Kinoshita K, Kobayashi M, Naitoh Y, Akinaga H, Miyamoto S, Nokami T, Itoh T. Characterization of Information-Transmitting Materials Produced in Ionic Liquid-based Neuromorphic Electrochemical Devices for Physical Reservoir Computing. ACS Appl Mater Interfaces 2023; 15:49712-49726. [PMID: 37815984 PMCID: PMC10614198 DOI: 10.1021/acsami.3c08638] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Accepted: 09/12/2023] [Indexed: 10/12/2023]
Abstract
Device implementation of reservoir computing, which is expected to enable high-performance data processing in simple neural networks at a low computational cost, is an important technology to accelerate the use of artificial intelligence in the real-world edge computing domain. Here, we propose an ionic liquid-based physical reservoir device (IL-PRD), in which copper cations dissolved in an IL induce diverse electrochemical current responses. The origin of the electrochemical current from the IL-PRD was investigated spectroscopically in detail. After operating the device under various operating conditions, X-ray photoelectron spectroscopy of the IL-PRD revealed that electrochemical reactions involving Cu, Cu2O, Cu(OH)2, CuSx, and H2O occur at the Pt electrode/IL interface. These products are considered information transmission materials in IL-PRD similar to neurotransmitters in biological neurons. By introducing the Faradaic current components due to the electrochemical reactions of these materials into the output signal of IL-PRD, we succeeded in improving the time-series data processing performance of the nonlinear autoregressive moving average task. In addition, the information processing efficiency in machine learning to classify electrocardiogram signal waveforms was successfully improved by using the output current from IL-PRD. Optimizing the electrochemical reaction products of IL-PRD is expected to advance data processing technology in society.
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Affiliation(s)
- Dan Sato
- Device
Technology Research Institute, National
Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan
- Department
of Applied Physics, Graduate School of Science, Tokyo University of Science, Katsushika, Tokyo 125-8585, Japan
| | - Hisashi Shima
- Device
Technology Research Institute, National
Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan
| | - Takuma Matsuo
- Device
Technology Research Institute, National
Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan
- Department
of Applied Physics, Graduate School of Science, Tokyo University of Science, Katsushika, Tokyo 125-8585, Japan
| | - Masaharu Yonezawa
- Device
Technology Research Institute, National
Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan
- Department
of Applied Physics, Graduate School of Science, Tokyo University of Science, Katsushika, Tokyo 125-8585, Japan
| | - Kentaro Kinoshita
- Department
of Applied Physics, Graduate School of Science, Tokyo University of Science, Katsushika, Tokyo 125-8585, Japan
| | - Masakazu Kobayashi
- Department
of Applied Physics, Graduate School of Science, Tokyo University of Science, Katsushika, Tokyo 125-8585, Japan
- New
Value Creation Office, NAGASE & CO.,
LTD., Nihonbashi, Tokyo 103-8355, Japan
| | - Yasuhisa Naitoh
- Device
Technology Research Institute, National
Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan
| | - Hiroyuki Akinaga
- Device
Technology Research Institute, National
Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan
| | - Shunsuke Miyamoto
- Center
for Research on Green Sustainable Chemistry, Faculty of Engineering, Tottori University, Koyama, Tottori 680-8552, Japan
| | - Toshiki Nokami
- Center
for Research on Green Sustainable Chemistry, Faculty of Engineering, Tottori University, Koyama, Tottori 680-8552, Japan
| | - Toshiyuki Itoh
- Toyota
Physical and Chemical Research Institute, Nagakute, Aichi 480-1192, Japan
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Matsuo T, Sato D, Koh SG, Shima H, Naitoh Y, Akinaga H, Itoh T, Nokami T, Kobayashi M, Kinoshita K. Dynamic Nonlinear Behavior of Ionic Liquid-Based Reservoir Computing Devices. ACS Appl Mater Interfaces 2022; 14:36890-36901. [PMID: 35880990 PMCID: PMC9389526 DOI: 10.1021/acsami.2c04167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 03/07/2022] [Accepted: 07/13/2022] [Indexed: 06/15/2023]
Abstract
Herein, a physical reservoir device that uses faradaic currents generated by redox reactions of metal ions in ionic liquids was developed. Synthetic time-series data consisting of randomly arranged binary number sequences ("1" and "0") were applied as isosceles-triangular voltage pulses with positive and negative voltage heights, respectively, and the effects of the faradaic current on short-term memory and parity-check task accuracies were verified. The current signal for the first half of the triangular voltage-pulse period, which contained a much higher faradaic current component compared to that of the second half of the triangular voltage-pulse period, enabled higher short-term memory task accuracy. Furthermore, when parity-check tasks were performed using a faradaic current generated by asymmetric triangular voltage-pulse levels of 1 and 0, the parity-check task accuracy was approximately eight times higher than that of the symmetric triangular voltage pulse in terms of the correlation coefficient between the output signal and target data. These results demonstrate the advantage of the faradaic current on both the short-term memory characteristics and nonlinear conversion capabilities and are expected to provide guidance for designing and controlling various physical reservoir devices that utilize electrochemical reactions.
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Affiliation(s)
- Takuma Matsuo
- Department
of Applied Physics, Graduate School of Science, Tokyo University of Science, Katsushika, Tokyo 125-8585, Japan
- Device
Technology Research Institute, National
Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan
| | - Dan Sato
- Department
of Applied Physics, Graduate School of Science, Tokyo University of Science, Katsushika, Tokyo 125-8585, Japan
- Device
Technology Research Institute, National
Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan
| | - Sang-Gyu Koh
- Department
of Applied Physics, Graduate School of Science, Tokyo University of Science, Katsushika, Tokyo 125-8585, Japan
- Device
Technology Research Institute, National
Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan
| | - Hisashi Shima
- Device
Technology Research Institute, National
Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan
| | - Yasuhisa Naitoh
- Device
Technology Research Institute, National
Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan
| | - Hiroyuki Akinaga
- Device
Technology Research Institute, National
Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8565, Japan
| | - Toshiyuki Itoh
- Toyota
Physical and Chemical Research Institute, Nagakute, Aichi 480-1192, Japan
| | - Toshiki Nokami
- Center
for Research on Green Sustainable Chemistry, Faculty of Engineering, Tottori University, Koyama, Tottori 680-8552, Japan
| | - Masakazu Kobayashi
- New
Value Creation Office, NAGASE & CO.,
LTD., Nihonbashi, Tokyo 103-8355, Japan
| | - Kentaro Kinoshita
- Department
of Applied Physics, Graduate School of Science, Tokyo University of Science, Katsushika, Tokyo 125-8585, Japan
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Espinosa JR, Galván M, Quiñones AS, Ayala JL, Ávila V, Durón SM. Electrochemical Resistive DNA Biosensor for the Detection of HPV Type 16. Molecules 2021; 26:molecules26113436. [PMID: 34198893 PMCID: PMC8200989 DOI: 10.3390/molecules26113436] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Revised: 05/29/2021] [Accepted: 06/03/2021] [Indexed: 11/16/2022] Open
Abstract
In this work, a low-cost and rapid electrochemical resistive DNA biosensor based on the current relaxation method is described. A DNA probe, complementary to the specific human papillomavirus type 16 (HPV-16) sequence, was immobilized onto a screen-printed gold electrode. DNA hybridization was detected by applying a potential step of 30 mV to the system, composed of an external capacitor and the modified electrode DNA/gold, for 750 µs and then relaxed back to the OCP, at which point the voltage and current discharging curves are registered for 25 ms. From the discharging curves, the potential and current relaxation were evaluated, and by using Ohm's law, the charge transfer resistance through the DNA-modified electrode was calculated. The presence of a complementary sequence was detected by the change in resistance when the ssDNA is transformed in dsDNA due to the hybridization event. The target DNA concentration was detected in the range of 5 to 20 nM. The results showed a good fit to the regression equation ΔRtotal(Ω)=2.99 × [DNA]+81.55, and a detection limit of 2.39 nM was obtained. As the sensing approach uses a direct current, the electronic architecture of the biosensor is simple and allows for the separation of faradic and nonfaradaic contributions. The simple electrochemical resistive biosensor reported here is a good candidate for the point-of-care diagnosis of HPV at a low cost and in a short detection time.
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Affiliation(s)
- José R. Espinosa
- Unidad Académica de Ingeniería Eléctrica, Universidad Autónoma de Zacatecas, Col. Centro, Av. Ramón López Velarde 801. Zacatecas, Zacatecas C.P. 98000, Mexico
- Unidad Académica de Ingeniería I, Ingeniería Mecánica, Universidad Autónoma de Zacatecas, Col. Centro, Av. Ramón López Velarde 801. Zacatecas, Zacatecas C.P. 98000, Mexico
- Correspondence: (J.R.E.); (S.M.D.); Tel.:+52−4929256690 (ext. 4655) (S.M.D.)
| | - Marisol Galván
- Unidad Académica de Ciencias Químicas, Universidad Autónoma de Zacatecas, Campus Siglo XXI, Edif. 6, Km 6 carr. Zacatecas-Guadalajara, Zacatecas C.P. 98160, Mexico; (M.G.); (A.S.Q.); (J.L.A.)
| | - Arturo S. Quiñones
- Unidad Académica de Ciencias Químicas, Universidad Autónoma de Zacatecas, Campus Siglo XXI, Edif. 6, Km 6 carr. Zacatecas-Guadalajara, Zacatecas C.P. 98160, Mexico; (M.G.); (A.S.Q.); (J.L.A.)
| | - Jorge L. Ayala
- Unidad Académica de Ciencias Químicas, Universidad Autónoma de Zacatecas, Campus Siglo XXI, Edif. 6, Km 6 carr. Zacatecas-Guadalajara, Zacatecas C.P. 98160, Mexico; (M.G.); (A.S.Q.); (J.L.A.)
| | - Verónica Ávila
- Instituto Politécnico Nacional, Unidad Profesional Interdisciplinaria de Ingeniería Campus Zacatecas, Ingeniería Ambiental, Zacatecas C.P. 98160, Mexico;
| | - Sergio M. Durón
- Unidad Académica de Ciencias Químicas, Universidad Autónoma de Zacatecas, Campus Siglo XXI, Edif. 6, Km 6 carr. Zacatecas-Guadalajara, Zacatecas C.P. 98160, Mexico; (M.G.); (A.S.Q.); (J.L.A.)
- Correspondence: (J.R.E.); (S.M.D.); Tel.:+52−4929256690 (ext. 4655) (S.M.D.)
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Feng GH, Huang WL. Investigation on the Mechanical and Electrical Behavior of a Tuning Fork-Shaped Ionic Polymer Metal Composite Actuator with a Continuous Water Supply Mechanism. Sensors (Basel) 2016; 16:433. [PMID: 27023549 DOI: 10.3390/s16040433] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2016] [Revised: 03/14/2016] [Accepted: 03/21/2016] [Indexed: 11/17/2022]
Abstract
This paper presents an innovative tuning fork-shaped ionic polymer metal composite (IPMC) actuator. With an integrated soft strain gauge and water supply mechanism (WSM), the surface strain of the actuator can be sensed in situ, and providing a continuous water supply maintains the water content inside the IPMC for long-term operation in air. The actuator was fabricated using a micromachining technique and plated with a nickel electrode. The device performance was experimentally characterized and compared with an actuator without a WSM. A large displacement of 1.5 mm was achieved for a 6 mm-long prong with 7-V dc actuation applied for 30 s. The measured current was analyzed using an electrochemical model. The results revealed that the faradaic current plays a crucial role during operation, particularly after 10 s. The measured strain confirms both the bending and axial strain generation during the open-and-close motion of the actuator prongs. Most of the water loss during device operation was due to evaporation rather than hydrolysis. The constructed WSM effectively maintained the water content inside the IPMC for long-term continuous operation.
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