Category Archives: 미분류

Low-Power, Electrochemically Tunable Graphene Synapses for Neuromorphic Computing

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

 

– Background
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)

1.png

<Fig. 1>

– Structure & Fabrication
v. Graphene layers – Solid electrolyte (LiClO4 in poly(ethylene oxide) (PEO) – Lithium   iron phosphate (LFP) (Fig. 2)

2.png

<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)

3.png

<Fig. 3>

– Results
v. Raman spectroscopy shows weakening of bond between graphene layers as   increasing Li-ion. (Fig. 4)

4.png

<Fig. 4>

 v. Resistance change (Figure. 5)

5.png

<Fig. 5>

Advertisements

Hydraulically amplified self-healing electrostatic actuators with muscle-like performance

Journal: MATERIALS SCIENCE

Author: Xin Lin , Berthold Wegner et. al

Affiliation: Department of Mechanical Engineering, University of Colorado

Publication date: 2018.01.05

Summarized by Taewon Seo

 

– HASEL actuators
v. Schematic of a donut HASEL actuator (Fig. 1)
v. Schematic of a stack of five donut HASEL actuators (Fig. 2)
v. Schematic of a single-unit planar HASEL actuator (Fig. 3)

fig1

Fig. 1

fig22.jpg

Fig. 2

fig3.jpg

Fig. 3

 

– Fabrication
v. For a donut HASEL (Fig. 4)
v. For a single-unit planar HASEL (Fig. 5)
v. Flexible electrodes of PAM-LiCl hydrogels (thickness of 200μm)
v. Self-healing Liquid dielectric of Envirotemp FR3 (Cargill)

 

fig4.jpg

Fig. 4

fig5.jpg

Fig. 5

 

– Self healing
v. Self-healing from dielectric breakdown (Fig. 6)
v. Self-healing capabilities (Fig. 7)
v. Supporting information : http://science.sciencemag.org/highwire/filestream/704298/field_highwire_adjunct_files/2/aao6139s2.mp4

fig6.jpg

Fig. 6

fig7.jpg

Fig. 7

 

– Result
v. Actuation strain of a donut HASEL (Fig. 8)
v. Cycle life of a donut HASEL (Fig. 9)
v. Actuation strain of a single-unit planar HASEL (Fig. 10)
v. Supporting information : https://www.youtube.com/watch?v=M4qcvTeN8k0

fig8.jpg

Fig. 8

fig9

Fig. 9

fig10.jpg

Fig. 10

Self-Powered, Paper-Based Electrochemical Devices for Sensitive Point-of-Care Testing

Journal: Advanced Materials Technologies

Publication date: 2017.08.22

Summarized by Inyeol Yun

 

– Self-powered, paper-based electrochemical devices (SPEDs)
v. Structure (Fig. 1)
v. Electrochemical detection (Fig. 2), colorimetric test
v. Triboelectric generator (TEG) (Fig. 3)

fig1

Fig. 1

fig2

Fig. 2

fig3

Fig. 3

 

– Fabrication
v. Biomarker part (Fig. 4)
v. TEG part (Fig. 5)

fig4

Fig. 4

fig5

Fig. 5

 

– Result
v. Electrochemical detection (Fig. 6)
v. TEG (Fig. 7)

fig6

Fig. 6

fig7

Fig. 7