Flexible transparent electrodes made of core-shell-structured carbon/ metal hybrid nanofiber mesh films fabricated via electrospinning and electroplating

다국어 초록 (Multilingual Abstract)

The development of practical flexible transparent electrodes is one of the major core technology fields for future nanoscale optoelectronics. Despite the many efforts to replace the indium tin oxide (ITO) electrode, preparing practical alternatives that satisfy the essential requirements of flexible transparent electrodes remains a challenge. In this work, core-shell-structured carbon/metal hybrid mesh (CSCMHM) films, comprised of a metal layer coated onto conductive carbon nanofiber network structures, were fabricated using electrospinning and electroplating and demonstrated potential for use as flexible transparent electrodes. In contrast to previously described techniques that use conventional polymer fibers as sacrificial structures, the conductive carbon nanofibers used in the current technique that we developed provided bi-functionality: they formed conductive core channels and artificial supports of the metal structures. The CS-CMHM films displayed superior optoelectrical, mechanical, and thermal properties: they transmitted ~91% of visible light, showed a low sheet resistance of ~2.7 U/sq, and displayed excellent mechanical stability even after 10000 cycles of bending the films to a radius of 5 mm; also, applying a voltage of only 3 V to a transparent heater based on CS-CMHM films resulted in the temperature of the film surface increasing very rapidly in the first 20 s, and soon thereafter reaching ~280 C. Based on these results, we believe that the use of CS-CMHM films and the process we developed to fabricate them open up great opportunities for high-performance flexible transparent electronics.

참고문헌 (Reference)

1 C. H. Seager, 10 : 1435-1446, 1974

2 J. -K. Song, "Wearable force touch sensor array using a flexible and transparent electrode" 27 : 1605286-, 2017

3 Z. Wu, "Transparent, conductive carbon nanotube films" 305 : 1273-1276, 2004

4 H. Wu, "Transparent electrode based on a metal nanotrough network" 8 : 421-425, 2013

5 A. R. Rathmell, "The growth mechanism of copper nanowires and their properties in flexible, transparent conducting films" 22 : 3558-3563, 2010

6 T. H. Ko, "The Influence of pyrolysis on physical properties and microstructure of modified PAN fibers during carbonization" 43 : 589-600, 1991

7 B. W. An, "Stretchable, transparent electrodes as wearable heaters using nanotrough networks of metallic glasses with superior mechanical properties and thermal stability" 16 : 471-478, 2016

8 B. W. An, "Stretchable and transparent electrodes using hybrid structures of graphene-metal nanotrough networks with high performances and ultimate uniformity" 14 : 6322-6328, 2014

9 S. Tsuyoshi, "Stretchable active-matrix organic light-emitting diode display using printable elastic conductors" 8 : 494-499, 2009

10 J. -Y. Lee, "Solution processed metal nanowire mesh transparent electrodes" 8 : 689-692, 2008

11 D. J. Lipomi, "Skin-like pressure and strain sensors based on transparent elastic films of carbon nanotubes" 6 : 788-792, 2011

12 S. De, "Size effects and the problem with percolation in nanostructured transparent conductors" 4 : 7064-7072, 2010

13 J. Mittal, "Single step carbonization and graphitization of highly stabilized PAN fibers" 35 : 1196-1197, 1997

14 Z. Yu, "Silver nanowire-polymer composite electrodes for efficient polymer solar cells" 23 : 4453-4457, 2011

15 S. De, "Silver nanowire networks as flexible, transparent, conducting films: extremely high DC to optical conductivity ratios" 3 : 1767-1774, 2009

16 R. B. Mathur, "Shrinkage behaviour of modified PAN precursors-its influence on the properties of resulting carbon fibre" 14 : 179-187, 1986

17 S. An, "Self-junctioned copper nanofiber transparent flexible conducting film via electrospinning and electroplating" 28 : 7149-7154, 2016

18 P. -C. Hsu, "Performance enhancement of metal nanowire transparent conducting electrodes by mesoscale metal wires" 4 : 1-7, 2013

19 P. C. Hsu, "Passivation coating on electrospun copper nanofibers for stable transparent electrodes" 6 : 5150-5156, 2012

20 J. Li, "Organic light-emitting diodes having carbon nanotube anodes" 6 : 2472-2477, 2006

21 J. W. Huh, "New approach for fabricating hybridstructured metal mesh films for flexible transparent electrodes by the combination of electrospinning and metal deposition" 27 : 4753029-, 2016

22 K. S. Kim, "Large-scale pattern growth of graphene films for stretchable transparent electrodes" 457 : 706-710, 2009

23 G. Eda, "Large-area ultrathin films of reduced graphene oxide as a transparent and flexible electronic material" 3 : 270-274, 2008

24 T. K. Ko, "Influence of continuous stabilization on the physical properties and microstructure of PAN-based carbon fibers" 42 : 1949-1957, 1991

25 M. Vosgueritchian, "Highly conductive and transparent PEDOT: PSS films with a fluorosurfactant for stretchable and flexible transparent electrodes" 22 : 421-428, 2012

26 X. Li, "Highly conducting graphene sheets and Langmuir-Blodgett films" 3 : 538-542, 2008

27 H. Sirringhaus, "High-resolution inkjet printing of all-polymer transistor circuits" 290 : 2123-2126, 2000

28 M. Trinquecoste, "High temperature thermal and mechanical properties of high tensile carbon single filaments" 34 : 923-929, 1996

29 G. P. Kushto, "Flexible organic photovoltaics using conducting polymer electrodes" 86 : 093502-, 2005

30 J. W. Kim, "Fabrication of three-dimensional nanostructure-embedded ITO and its application as a transparent electrode for high-efficiency solution processable organic photovoltaic devices" 9 : 3033-3039, 2017

31 D. S. Hecht, "Emerging transparent electrodes based on thin films of carbon nanotubes, graphene, and metallic nanostructures" 23 : 1482-1513, 2011

32 H. Wu, "Electrospun metal nanofiber webs as high-performance transparent electrode" 10 : 4242-4248, 2010

33 P. Rangarajan, "Dynamic oscillatory shear properties of potentially melt processable high acrylonitrile terpolymers" 43 : 2699-2709, 2002

34 R. G. Gordon, "Criteria for choosing transparent conductors" 25 : 52-57, 2000

35 H. -J. Jeon, "Complex high-aspect-ratio metal nanostructures by secondary sputtering combined with block copolymer self-assembly" 28 : 8439-8445, 2016

36 J. W. Huh, "Characteristics of organic light-emitting diodes with conducting polymer anodes on plastic substrates" 103 : 044502-, 2008

37 S. Bae, "Balakrishnan, T. Lei, H.R. Kim, Y.I. Song, Roll-to-roll production of 30-inch graphene films for transparent electrodes" 5 : 574-578, 2010

38 M. S. A. Rahaman, "A review of heat treatment on polyacrylonitrile fiber" 92 : 1421-1432, 2007