Journal: Advanced Materials
Authors: M. T. Sharbati and F. Xiong et al.
Affiliation: The University of Pittsburgh (USA)
Publication date: 2018.07.23
Summarized by Inyeol Yun
v. The neural network in a human brain has ≈1011 neurons. Each neuron is typically connected to ≈5,000 to 10,000 other neurons through synapse.
v. Synapse plasticity is the ability of synapses to strengthen or weaken over time, in response to increases or decreases in their activity (Wikipedia). It related to memory function.
v. Typical artificial synapses cannot mimic the analog behaviors of biological synapses.
v. In this paper, authors demonstrate the synapse plasticity using “nano-battery” technology. (Fig. 1)
– Structure & Fabrication
v. Graphene layers – Solid electrolyte (LiClO4 in poly(ethylene oxide) (PEO) – Lithium iron phosphate (LFP) (Fig. 2)
v. Metal contacts (80 nm of Cu) were defined by e-beam lithography and deposited through e-beam evaporation.
v. Real image (Fig. 3)
v. Raman spectroscopy shows weakening of bond between graphene layers as increasing Li-ion. (Fig. 4)
v. Resistance change (Figure. 5)