Curved copper nanowires-based robust flexible transparent electrodes via all-solution approach
Curved Cu nanowire (CCN)-based high-performance flexible transparent conductive electrodes (FTCEs) were fabricated via a fully solution-processed approach, involving synthesis, coating, patterning, welding, and transfer. Each step involved an innovative technique for completing the all-solution processes. The high-quality and well-dispersed CCNs were synthesized using a multi-polyol method through the synergistic effect of specific polyol reduction. To precisely control the optoelectrical properties of the FTCEs, the CCNs were uniformly coated on a polyimide (PI) substrate via a simple meniscus-dragging deposition method by tuning several coating parameters. We also employed a polyurethane (PU)-stamped patterning method to effectively produce 20 μm patterns on CCN thin films. The CCN thin films exhibited high electrical performance, which is attributed to the deeply percolated CCN network formed via a solvent-dipped welding method. Finally, the CCN thin films on the PI substrate were partially embedded and transferred to the PU matrix to reduce their surface roughness. Through consecutive processes involving the proposed methods, a highly percolated CCN thin film on the PU matrix exhibited high optoelectrical performance (Rs = 53.48 Ω/□ at T = 85.71%), excellent mechanical properties (R/R0 < 1.10 after the 10th repetition of tape peeling or 1,000 bending cycles), and a low root-mean-square surface roughness (Rrms = 14.36 nm).
Keywordscurved Cu nanowires all-solution processes 20 μm patterns high performance transparent electrode
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- Lee, J.; Lee, P.; Lee, H. B.; Hong, S. K.; Lee, I.; Yeo, J.; Lee, S. S.; Kim, T. S.; Lee, D. J.; Ko, S. H. Roomtemperature nanosoldering of a very long metal nanowire network by conducting-polymer-assisted joining for a flexible touch-panel application. Adv. Funct. Mater. 2013, 23, 4171–4176.CrossRefGoogle Scholar
- Peng, H. J.; Huang, J. Q.; Zhao, M. Q.; Zhang, Q.; Cheng, X. B.; Liu, X. Y.; Qian, W. Z.; Wei, F. Nanoarchitectured graphene/CNT@porous carbon with extraordinary electrical conductivity and interconnected micro/mesopores for lithiumsulfur batteries. Adv. Funct. Mater. 2014, 24, 2772–2781.CrossRefGoogle Scholar
- Kim, Y.; Ryu, T. I.; Ok, K.-H.; Kwak, M.-G.; Park, S.; Park, N.-G.; Han, C. J.; Kim, B. S.; Ko, M. J.; Son, H. J. et al. Inverted layer-by-layer fabrication of an ultraflexible and transparent Ag nanowire/conductive polymer composite electrode for use in high-performance organic solar cells. Adv. Funct. Mater. 2015, 25, 4580–4589.CrossRefGoogle Scholar
- Im, H.-G.; Jung, S.-H.; Jin, J.; Lee, D.; Lee, J.; Lee, D.; Lee, J.-Y.; Kim, I.-D.; Bae, B.-S. Flexible transparent conducting hybrid film using a surface-embedded copper nanowire network: A highly oxidation-resistant copper nanowire electrode for flexible optoelectronics. ACS Nano 2014, 8, 10973–10979.CrossRefGoogle Scholar
- Ding, S.; Jiu, J. T.; Gao, Y.; Tian, Y. H.; Araki, T.; Sugahara, T.; Nagao, S.; Nogi, M.; Koga, H.; Suganuma, H. et al. One-step fabrication of stretchable copper nanowire conductors by a fast photonic sintering technique and its application in wearable devices. ACS Appl. Mater. Interfaces 2016, 8, 6190–6199.CrossRefGoogle Scholar
- Yin, Z. X.; Lee, C.; Cho, S.; Yoo, J.; Piao, Y. Z.; Kim, Y. S. Facile synthesis of oxidation-resistant copper nanowires toward solution-processable, flexible, foldable, and free-standing electrodes. Small 2014, 10, 5047–5052.Google Scholar
- Park, S.; Pitner, G.; Giri, G.; Koo, J. H.; Park, J.; Kim, K.; Wang, H. L.; Sinclair, R.; Wong, H. S. P.; Bao, Z. Large-area assembly of densely aligned single-walled carbon nanotubes using solution shearing and their application to field-effect transistors. Adv. Mater. 2015, 27, 2656–2662.CrossRefGoogle Scholar
- Landau, L.; Levich, B. Dragging of a liquid by a moving plate. Acta Physicochim. URSS 1942, 17, 42–54.Google Scholar
- Yang, H. Y.; Park, H.-W.; Kim, S. J.; Hong, J.-M.; Kim, T. W.; Kim, D. H.; Lim, J. A. Intense pulsed light induced crystallization of a liquid-crystalline polymer semiconductor for efficient production of flexible thin-film transistors. Phys. Chem. Chem. Phys. 2016, 18, 4627–4634.CrossRefGoogle Scholar
- Kim, U. J.; Lee, I. H.; Bae, J. J.; Lee, S.; Han, G. H.; Chae, S. J.; Güneş, F.; Choi, J. H.; Baik, C. W.; Kim, S. et al. Graphene/carbon nanotube hybrid-based transparent 2D optical Array. Adv. Mater. 2011, 23, 3809–3814.Google Scholar