Wide-Range Synaptic Current Responses with a Liquid Ga Electrode via a Surface Redox Reaction in a NaOH Solution at Different Molar Concentrations

Dahee Seo; Seongyeon Kang; Heejoong Ryou; Myunghun Shin; Wan Sik Hwang

doi:10.1021/acsomega.3c05352

Wide-Range Synaptic Current Responses with a Liquid Ga Electrode via a Surface Redox Reaction in a NaOH Solution at Different Molar Concentrations

ACS Omega. 2023 Oct 23;8(44):41495-41501. doi: 10.1021/acsomega.3c05352. eCollection 2023 Nov 7.

Authors

Dahee Seo^{1

2}, Seongyeon Kang¹, Heejoong Ryou^{1

2}, Myunghun Shin³, Wan Sik Hwang^{1

2}

Affiliations

¹ Department of Materials Science and Engineering, Korea Aerospace University, Goyang 10540, Republic of Korea.
² Department of Smart Air Mobility, Korea Aerospace University, Goyang 10540, Republic of Korea.
³ School of Electronics and Information Engineering, Korea Aerospace University, Goyang 10540, Republic of Korea.

Abstract

A liquid Ga-based synaptic device with two-terminal electrodes is demonstrated in NaOH solutions at 50 °C. The proposed electrochemical redox device using the liquid Ga electrode in the NaOH solution can emulate various biological synapses that require different decay constants. The device exhibits a wide range of current decay times from 60 to 320 ms at different NaOH mole concentrations from 0.2 to 1.6 M. This research marks a step forward in the development of flexible and biocompatible neuromorphic devices that can be utilized for a range of applications where different synaptic strengths are required lasting from a few milliseconds to seconds.