Category Archives: Others

A Strain-absorbing Design for Tissue–machine Interfaces Using a Tunable Adhesive Gel

Author: Sungwon Lee, Takao Someya et al.

Affiliation: The University of Tokyo, Japan Science and Technology Agency (JST)

Publication date: 2014.12.19

Summarized by Seongmin Park

 

– Structure
v. 1.4 μm PET substrate, 20 nm Au word line, 50 nm Au bit line, 30 nm DNTT active layer, 200 nm parylene gate dielectric layer

fig1

Fig. 1

v. Only the area covered by photopatterned gel maintains an adhesive contact during measurement  the floating parts of the device absorb strain

fig2.png

Fig. 2

fig3.png

Fig. 3

 

–Adhesive gel property
v. adhesion strength: Adhesion strength is enough for supporting a coin (5g)

fig4.png

Fig. 4

v. Adhesive gel constituents

fig5

Fig. 5

v. Properties controlled by PVA concentration

1. Modulus of adhesive gel

fig6.png

Fig. 6

2. Adhesion strength vs. glass

 

fig7.png

Fig. 7

3. Resistance and capacitance (Dashed line represents the capacitance.)

fig8.png

Fig. 8

– Results
v. OTFT performance: 10 times 100% compressive strainàremains its performance

fig9.png

Fig. 9

v. Device on a balloon: Can endure ~100% compressive strain

fig10.png

Fig. 10

fig11.png

Fig. 11

Advertisements

Highly Flexible and Efficient Fabric Based Organic Light-Emitting Devices for Clothing-Shaped Wearable Displays

Journal: Scientific Reports

Publication date: 2017.07.25

Summarized by Seongmin Park

 

– Methods to achieve actual clothing-shaped information displays

  1. Attaching a display panel onto a piece of clothing → Flexibility decreases
  2. Fabricating of light emitting fiber → Low emission performance
  3. Fabricating an information display onto a fabric → Best choice

– Novel Concept

v. Spin coating of the silane-based film on fabric (Fig. 1, 2)

fig1

Fig. 1

fig2

Fig. 2

– Structure

  1. Base Structure (Fig.3)

fig3

Fig. 3

     2. Endurance vs. Number of dyads (Fig. 4, 5)

fig4

Fig. 4

fig5

Fig. 5

     3. Optimized Structure (Fig. 6)

fig6

Fig. 6

     4. Good Endurance

fig7

Fig. 7

 

– Results

  1. Similar performance (Fig. 8)

fig8

Fig. 8

     2. Light emitting performances vs. bending radius (Fig. 9)

fig9

Fig. 9

     3. Comparison between OLEDs on fabric and OLEDs on PET (Fig. 10)

fig10

Fig. 10

     4. Cyclic bending with bending radius of 1 cm (Fig. 11)

fig11

Fig. 11

 

Fully Printable, Strain-engineered Electronic Wrap for Customizable Soft Electronics

Journal: Scientific Reports

Publication date: 2017. 03. 24

Summarized by Inyeol Yun

 

– Concept

v. PDMS-PRI-PDMS Structure (Fig. 1)

v. Devices (LEDs, IC Chips) are mounted on PRI (Printed Rigid Island).

v. Concept from stretchable beat network (Fig. 2)

v. Device (bead) is stable because stress is concentrated on PDMS (spring) when mechanical deformation is applied to the wrap. (Fig. 3)

v. Printed silver wire was encapsulated by PDMS -> prevent silver wire deformation

fig1

Fig. 1

fig2

Fig. 2

fig3

Fig. 3

 

– Fabrication

v. Fabrication process of the PRI-embedded soft wrap (Fig. 4)

v. Devices were bonded with inkjet-printed Ag pads via Ag epoxy. (Fig. 5)

fig4.png

Fig. 4

fig5

Fig. 5