Novel Flexible Transparent Conductive Films with Enhanced Chemical and Electromechanical Sustainability: TiO2 Nanosheet–Ag Nanowire Hybrid
2018
Sohn, Hiesang | Kim, Seyun | Shin, Weonho | Lee, Jong Min | Lee, Hyangsook | Yun, Dong-Jin | Moon, Kyoung-Seok | Han, In Taek | Kwak, Chan | Hwang, Seong-Ju
Flexible transparent conductive films (TCFs) of TiO₂ nanosheet (TiO₂ NS) and silver nanowire (Ag NW) network hybrid were prepared through a simple and scalable solution-based process. The as-formed TiO₂ NS–Ag NW hybrid TCF shows a high optical transmittance (TT: 97% (90.2% including plastic substrate)) and low sheet resistance (Rₛ: 40 Ω/sq). In addition, the TiO₂ NS–Ag NW hybrid TCF exhibits a long-time chemical/aging and electromechanical stability. As for the chemical/aging stability, the hybrid TCF of Ag NW and TiO₂ NS reveals a retained initial conductivity (ΔRₛ/Rₛ < 1%) under ambient oxidant gas over a month, superior to that of bare Ag NW (ΔRₛ/Rₛ > 4000%) or RuO₂ NS–Ag NW hybrid (ΔRₛ/Rₛ > 200%). As corroborated by the density functional theory simulation, the superb chemical stability of TiO₂ NS–Ag NW hybrid is attributable to the unique role of TiO₂ NS as a barrier, which prevents Ag NW’s chemical corrosion via the attenuated adsorption of sulfidation molecules (H₂S) on TiO₂ NS. With respect to the electromechanical stability, in contrast to Ag NWs (ΔR/R₀ ∼ 152.9%), our hybrid TCF shows a limited increment of fractional resistivity (ΔR/R₀ ∼ 14.4%) after 200 000 cycles of the 1R bending test (strain: 6.7%) owing to mechanically welded Ag NW networks by TiO₂ NS. Overall, our unique hybrid of TiO₂ NS and Ag NW exhibits excellent electrical/optical properties and reliable chemical/electromechanical stabilities.
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