Novel Flexible Transparent Conductive Films with Enhanced Chemical and Electromechanical Sustainability: TiO2 Nanosheet-Ag Nanowire Hybrid

Hiesang Sohn, Seyun Kim, Weonho Shin, Jong Min Lee, Hyangsook Lee, Dong Jin Yun, Kyoung Seok Moon, In Taek Han, Chan Kwak, Seong Ju Hwang

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)2688-2700
Number of pages13
JournalACS Applied Materials and Interfaces
Volume10
Issue number3
DOIs
Publication statusPublished - 2018 Jan 24

All Science Journal Classification (ASJC) codes

  • Materials Science(all)

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