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Journal Article
Reduced water vapor transmission rates of low-temperature-processed and sol-gel-derived titanium oxide thin films on flexible substrates
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- Authors
- Seonuk Park, Lae Ho Kim, Yong Jin Jeong, Kyunghun Kim, Min Park, Yonghwa Baek, Tae Kyu An, Sooji Nam, Jaeyoung Jang, Chan Eon Park
- Issue Date
- 2016-09
- Citation
- Organic Electronics, v.36, pp.133-139
- ISSN
- 1566-1199
- Publisher
- Elsevier
- Language
- English
- Type
- Journal Article
- Abstract
- Sol-gel-derived, crack-free, and condensed TiOx thin films with improved barrier properties were successfully fabricated on polymeric substrates with a simple two-step heat treatment at low temperatures. To assess the barrier properties of the TiOx thin films, Ca corrosion tests were conducted and their water vapor transmission rates (WVTRs) were measured. We found that the two-step heat treatment (at 45 °C for 90 min and 110 °C for 60 min) produces a close-packed TiOx structure that substantially reduces the WVTRs of the coated polymeric substrates. The WVTRs of 86 nm thick TiOx thin films on polyethylene naphthalate (PEN) substrates at a relative humidity (RH) of 90% were found to be 0.133 g m-2 day-1 at 38 °C and 0.0387 g m-2 day-1 at 25 °C. In addition, the WVTR value of the TiOx thin films on PEN substrates are stable with respect to bending: it was found to increase by only ~13% after 100 repetitions of bending with a 20 mm radius.
- KSP Keywords
- Corrosion tests, Flexible substrate, Low temperature(LT), Oxide thin films, PEN substrates, Polyethylene naphthalate, Relative Humidity, Sol-gel-derived, Two-step heat treatment, Water vapor transmission, barrier properties