Molecular switching by proton-coupled electron transport drives giant negative differential resistance

Qian Zhang, Yulong Wang, Cameron Nickle, Ziyu Zhang, Andrea Leoncini, Dong-Chen Qi, Kai Sotthewes, Alessandro Borrini, Harold J. W. Zandvliet, Enrique Barco (), Damien Thompson () and Christian A. Nijhuis ()
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Qian Zhang: National University of Singapore, 3 Science Drive 3
Yulong Wang: National University of Singapore, 3 Science Drive 3
Cameron Nickle: University of Central Florida
Ziyu Zhang: National University of Singapore, 3 Science Drive 3
Andrea Leoncini: National University of Singapore, 3 Science Drive 3
Dong-Chen Qi: Queensland University of Technology
Kai Sotthewes: University of Twente
Alessandro Borrini: University of Twente
Harold J. W. Zandvliet: University of Twente
Enrique Barco: University of Central Florida
Damien Thompson: University of Limerick
Christian A. Nijhuis: University of Twente

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract To develop new types of dynamic molecular devices with atomic-scale control over electronic function, new types of molecular switches are needed with time-dependent switching probabilities. We report such a molecular switch based on proton-coupled electron transfer (PCET) reaction with giant hysteric negative differential resistance (NDR) with peak-to-valley ratios of 120 ± 6.6 and memory on/off ratios of (2.4 ± 0.6) × 103. The switching dynamics probabilities are modulated by bias voltage sweep rate and can also be controlled by pH and relative humidity, confirmed by kinetic isotope effect measurements. The demonstrated dynamical and environment-specific modulation of giant NDR and memory effects provide new opportunities for bioelectronics and artificial neural networks.

Date: 2024
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DOI: 10.1038/s41467-024-52496-y

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