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Artificial Synaptic Behavior of Aloe Polysaccharides-Based Device with Au as Top Electrode

Published online by Cambridge University Press:  16 December 2019

Z. X. Lim ,
I. A. Tayeb ,
Z. A. A. Hamid ,
M. F. Ain ,
A. M. Hashim ,
J. M. Abdullah ,
A. A. Sivkov ,
F. Zhao  and
K. Y. Cheong
Z. X. Lim
Affiliation:
Electronic Materials Research Group, School of Materials & Mineral Resources Engineering, Universiti Sains Malaysia, Nibong Tebal, Penang 14300, Malaysia
I. A. Tayeb
Affiliation:
Electronic Materials Research Group, School of Materials & Mineral Resources Engineering, Universiti Sains Malaysia, Nibong Tebal, Penang 14300, Malaysia
Z. A. A. Hamid
Affiliation:
Electronic Materials Research Group, School of Materials & Mineral Resources Engineering, Universiti Sains Malaysia, Nibong Tebal, Penang 14300, Malaysia
M. F. Ain
Affiliation:
School of Electrical & Electronic Engineering, Universiti Sains Malaysia, Nibong Tebal, Penang 14300, Malaysia
A. M. Hashim
Affiliation:
Malaysia-Japan International Institute of Technology, Universiti Teknologi Malaysia, Jalan Sultan Yahya Petra, Kuala Lumpur 54100, Malaysia
J. M. Abdullah
Affiliation:
Brain Behaviour Cluster, School of Medical Sciences, Universiti Sains Malaysia Health Campus, Jalan Hospital USM, 16150 Kubang Kerian, Kota Bahru, Kelantan, Malaysia
A. A. Sivkov
Affiliation:
Nanoelectronic and Energy Laboratory, School of Engineering & Computer Science, Washington State University, Vancouver, WA 98686 USA
F. Zhao*
Affiliation:
Nanoelectronic and Energy Laboratory, School of Engineering & Computer Science, Washington State University, Vancouver, WA 98686 USA
K. Y. Cheong
Affiliation:
Electronic Materials Research Group, School of Materials & Mineral Resources Engineering, Universiti Sains Malaysia, Nibong Tebal, Penang 14300, Malaysia
*
*(Email: feng.zhao@wsu.edu)
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Abstract

Formulated, processed, and dried Aloe polysaccharides thin film sandwiched between ITO as bottom electrode and Au as top electrode has been adopted as an artificial synapse to emulate behavior of neuromorphic computing. The synaptic plasticity or weight has been modulated with this simple metal-insulator-metal structure by applying voltage sweep and voltage pulse, with excitatory postsynaptic current being monitored. Synaptic potentiation and depression has been demonstrated by applying 6 consecutive sweeps of voltage in positive and negative polarity, respectively. By varying number (10 – 50) of voltage pulses, variable synaptic weight has been measured with paired pulse facilitation and post-tetanic potentiation indexes of 2.61x10-6and 1.45x10-4, respectively. The short-term plasticity and long-term potentiation can be clearly revealed when applying 40 pulses and beyond, with extracted time constants of approximately 28 s at 40 pulses and 90 s at 50 pulses.

Keywords

dielectricelectronic materialmemorymicroelectronicsorganic
Type
Articles
Information
MRS Advances , Volume 5 , Issue 14-15: Soft Materials and Biomaterials , 2020 , pp. 693 - 698
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Copyright
Copyright © Materials Research Society 2019

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