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Volume 7 Innovative Energy & Research
ISSN: 2576-1463 Advanced Energy Materials 2018
August 13-14, 2018
August 13-14, 2018 | Dublin, Ireland
20th International Conference on
Advanced Energy Materials and Research
Extremely foldable and highly transparent nanofiber-based electrodes for liquid crystal smart devices
In Chul Kim1, Tae-Hyung Kim 2, Seung Hee Lee3 and Byoung-Suhk Kim1
1Department of Organic Materials & Fiber Engineering, Chonbuk National University, Republic of Korea
2Department of BIN Convergence Technology, Chonbuk National University, Republic of Korea
3Department of Polymer-Nano Science and Technology, Chonbuk National University, Republic of Korea
In recent years, flexible transparent electrodes have attracted great attention in many wearable optoelectronic devices,
such as touch screens, organic light-emitting diodes (OLEDs), solar cells, electronic skins, etc. The basic requirements for
foldable transparent electrodes are optical transparency, low electrical resistance, and high level of extreme bending toughness
without significant decrease in the electrical performance. Generally, resistivity and optical transmittance follow opposite
trends. It is therefore important to achieve the optimized balance between the electrical resistivity and optical transmittance
in order to get a highly conductive transparent electrode. Traditionally, commercial indium-tin oxide (ITO) electrodes have
been widely used in transparent conducting optoelectronic devices. However, there are still some disadvantages of ITO
electrodes in flexible electronic applications, such as the scarcity of indium, the high cost of manufacturing processing, and
their mechanical brittleness, which prompt the research for the alternative materials to replace the ITO electrodes for next
generation optoelectronic flexible devices. In this work, the nylon 6 nanofiber-reinforced cellulose acetate (NF-r-CA) film as a
fiber-based transparent substrate was used to develop the highly transparent electrodes with excellent durable and extremely
foldable properties. The NF45-r-CA electrodes prepared using AgNWs concentration of 0.025 wt% and electrospinning time
of 45 min were highly transparent (~ 90%), mechanically robust (59.6 MPa) and lower sheet resistance (20~30 Ω sq-1 ) even
under extreme bending radius of 1 mm for 10,000 cycles. In addition, the NF-r-CA based PDLC (Polymer Dispersed Liquid
Crystal) film could retain the working stability even after bending test of 500 cycles at an extreme bending radius of 1.5 mm,
whereas ITO PDLC film was stopped working after bending test of merely 50 cycles. This result demonstrates the excellent
foldable stability of NF-r-CA PDLC films at an extreme bending radius of 1.5 mm.
Innov Ener Res 2018, Volume 7
DOI: 10.4172/2576-1463-C1-003