Nanogenerator-induced synaptic plasticity and metaplasticity of bio-realistic artificial synapses

Bo Yun Kim, Hyun Gyu Hwang, Jong Un Woo, Woong Hee Lee, Tae Ho Lee, Chong Yun Kang, Sahn Nahm

Research output: Contribution to journalArticlepeer-review

59 Citations (Scopus)


A bio-realistic artificial synapse integrated with a nanogenerator (NG), which can be used in neuromorphic systems, is demonstrated for self-powered biomedical devices in this study. Biocompatible amorphous (Na0.5K0.5)NbO3 (NKN) films are grown on TiN/polyimide substrates to synthesize NKN memristors for use as artificial synapses. Various synaptic functions are realized in NKN memristors, which are driven by a pulse generator and an NG. The synaptic plasticity of the NKN memristor results from the oxygen vacancy movements and the changes in the shape of the oxygen vacancy filaments. As a further step toward developing more bio-realistic artificial synapses, various types of metaplasticity and their mechanisms in the NKN memristors are investigated. Moreover, the metaplasticity of spike-timing-dependent plasticity (a key characteristic of biological synapses) is realized in the NKN memristor with a priming stimulus given by the NKN NG.

Original languageEnglish
Article numbere381
JournalNPG Asia Materials
Issue number5
Publication statusPublished - 2017

Bibliographical note

Funding Information:
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT & Future Planning (2017R1A2B4007189). We thank the KU-KIST graduate school program of Korea University.

Publisher Copyright:
© The Author(s) 2017.

ASJC Scopus subject areas

  • Modelling and Simulation
  • General Materials Science
  • Condensed Matter Physics


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