Mixed receptors of AMPA and NMDA emulated using a ‘Polka Dot’-structured two-dimensional conjugated polymer-based artificial synapse

Hong Han; Feng Ge; Mingxue Ma; Haiyang Yu; Huanhuan Wei; Xue Zhao; Hongbing Yao; Jiangdong Gong; Longzhen Qiu; Wentao Xu

doi:10.1039/D0NH00348D

Mixed receptors of AMPA and NMDA emulated using a ‘Polka Dot’-structured two-dimensional conjugated polymer-based artificial synapse†

Hong Han,

^a Feng Ge,

^b Mingxue Ma,^a Haiyang Yu,^a Huanhuan Wei,^a Xue Zhao,^b Hongbing Yao,^b Jiangdong Gong,^a Longzhen Qiu

*^b and Wentao Xu

*^a

Author affiliations

* Corresponding authors

^a Institute of Optoelectronic Thin Film Devices and Technology, Key Laboratory of Optoelectronic Thin Film Devices and Technology of Tianjin, Nankai University, Tianjin 300350, China
E-mail: wentao@nankai.edu.cn

^b Academy of Opto-Electronic Technology, State Key Lab of Advanced Display Technology, Anhui Technology Innovation Center of Special Display and Imaging Technology, Hefei University of Technology, Hefei 230009, China
E-mail: lzhqiu@hfut.edu.cn

Abstract

In a biological synapse, α-amino-3-hydroxy-5-methyl-4-isoxazole propionic acid (AMPA) receptors mediate fast excitatory neurotransmission, whereas N-methyl-D-aspartate (NMDA) receptors trigger an enhanced memory effect; the complementary roles of AMPA and NMDA are essential in short-term plasticity (STP) to enhance memory effect (EME) transition. Herein, we report the design and fabrication of the first two-dimensional (2D) conjugated polymer (CP)-based synaptic transistor. The special design of the 2D CP with nanoscale-segregated ‘polka dot’-structured crystalline phases and adjacent amorphous phases emulate the different receptors of NMDA and AMPA on the postsynaptic membrane for the first time. The synergistic effect of mixed receptors distinguishes STP and enhanced memory effect with a critical point, which regulates the threshold level of the enhanced memory effect induction. This effect has not been reported yet. The special structure avoids easy saturation of a single receptor with consecutively increased excitatory postsynaptic current (EPSC) in response to 1200 stimuli. Furthermore, the 2D P3HT synapse successfully emulates activity-dependent synaptic plasticity, such as metaplasticity and homeostatic plasticity, which are advanced forms of plasticity, allowing the self-adaptive ability of a synapse, but have rarely been reported.

Nanoscale Horizons

Mixed receptors of AMPA and NMDA emulated using a ‘Polka Dot’-structured two-dimensional conjugated polymer-based artificial synapse†

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Mixed receptors of AMPA and NMDA emulated using a ‘Polka Dot’-structured two-dimensional conjugated polymer-based artificial synapse

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