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Volume 16
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Article

Synapse-Mimicking Memristors Based on 3,6-Di(tpy)-9-Phenylcarbazole Unimer and Its Copolymer with Cobalt(II) Ions

by
Ambika Pandey
1,2,
Andrei Chernyshev
3,
Yadu Ram Panthi
1,2,
Jiří Zedník
3,
Adriana Šturcová
2,
Magdalena Konefał
2,
Olga Kočková
2,
Stephen H. Foulger
4,5,
Jiří Vohlídal
3,* and
Jiří Pfleger
2,*
1
Faculty of Mathematics and Physics, Charles University, Ke Karlovu 3, 121 16 Prague, Czech Republic
2
Institute of Macromolecular Chemistry, Czech Academy of Sciences, Heyrovského nám. 2, 162 00 Prague, Czech Republic
3
Department of Physical and Macromolecular Chemistry, Faculty of Science, Charles University, Albertov 6, 128 00 Prague, Czech Republic
4
Center for Optical Materials Science and Engineering Technology (COMSET), Department of Materials Science and Engineering, Clemson University, Clemson, SC 29634, USA
5
Department of Bioengineering, Clemson University, Clemson, SC 29634, USA
*
Authors to whom correspondence should be addressed.
Polymers 2024, 16(4), 542; https://doi.org/10.3390/polym16040542
Submission received: 31 December 2023 / Revised: 9 February 2024 / Accepted: 14 February 2024 / Published: 17 February 2024
(This article belongs to the Special Issue Emerging Smart Applications of Functional Polymeric Materials)
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Abstract

The title compound, unimer U (tpy stands for 2,2′:6′,2″-terpyridin-4′-yl end-group), by itself shows the memristor effect with a retention time of 18 h and persistence of 11 h. Its coordination copolymer with Co(II) ions, [CoU]n, exhibits multimodal resistance changes similar to the synaptic responses observed in biological systems. More than 320 cycles of potentiation and depression measured in continuous sequence occurred without observing a significant current change, confirming the operational stability and reproducibility of the device based on the [CoU]n polymer. The synaptic effect of a device with an indium tin oxide (ITO)/[CoU]n/top-electrode (TE) configuration is more pronounced for the device with TE = Au compared to devices with TE = Al or Ga. However, the latter TEs provide a cost-effective approach without any significant compromise in device plasticity. The detected changes in the synaptic weight, about 12% for pair-pulse facilitation and 80% for its depression, together with a millisecond trigger and reading pulses that decay exponentially on the time scale typical of neurosynapses, justify the device’s ability to learn and memorize. These properties offer potential applications in neuromorphic computation and brain-inspired synaptic devices.
Keywords: carbazole; coordination polymer; memristor; metallo-supramolecular polymer; synapse-mimicking device; 2,2′:6′,2″-terpyridine carbazole; coordination polymer; memristor; metallo-supramolecular polymer; synapse-mimicking device; 2,2′:6′,2″-terpyridine
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MDPI and ACS Style

Pandey, A.; Chernyshev, A.; Panthi, Y.R.; Zedník, J.; Šturcová, A.; Konefał, M.; Kočková, O.; Foulger, S.H.; Vohlídal, J.; Pfleger, J. Synapse-Mimicking Memristors Based on 3,6-Di(tpy)-9-Phenylcarbazole Unimer and Its Copolymer with Cobalt(II) Ions. Polymers 2024, 16, 542. https://doi.org/10.3390/polym16040542

AMA Style

Pandey A, Chernyshev A, Panthi YR, Zedník J, Šturcová A, Konefał M, Kočková O, Foulger SH, Vohlídal J, Pfleger J. Synapse-Mimicking Memristors Based on 3,6-Di(tpy)-9-Phenylcarbazole Unimer and Its Copolymer with Cobalt(II) Ions. Polymers. 2024; 16(4):542. https://doi.org/10.3390/polym16040542

Chicago/Turabian Style

Pandey, Ambika, Andrei Chernyshev, Yadu Ram Panthi, Jiří Zedník, Adriana Šturcová, Magdalena Konefał, Olga Kočková, Stephen H. Foulger, Jiří Vohlídal, and Jiří Pfleger. 2024. "Synapse-Mimicking Memristors Based on 3,6-Di(tpy)-9-Phenylcarbazole Unimer and Its Copolymer with Cobalt(II) Ions" Polymers 16, no. 4: 542. https://doi.org/10.3390/polym16040542

APA Style

Pandey, A., Chernyshev, A., Panthi, Y. R., Zedník, J., Šturcová, A., Konefał, M., Kočková, O., Foulger, S. H., Vohlídal, J., & Pfleger, J. (2024). Synapse-Mimicking Memristors Based on 3,6-Di(tpy)-9-Phenylcarbazole Unimer and Its Copolymer with Cobalt(II) Ions. Polymers, 16(4), 542. https://doi.org/10.3390/polym16040542

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