NDLI: Hydrophilic Titania Thin Films from a Molecular Precursor Film Formed via Electrospray Deposition on a Quartz Glass Substrate Precoated with Carbon Nanotubes

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Hydrophilic Titania Thin Films from a Molecular Precursor Film Formed via Electrospray Deposition on a Quartz Glass Substrate Precoated with Carbon Nanotubes

Content Provider	MDPI
Author	Shafudah, Natangue Heita Nagai, Hiroki Suwazono, Yutaka Ozawa, Ryuhei Kudoh, Yukihiro Takahashi, Taiju Onuma, Takeyoshi Sato, Mitsunobu
Copyright Year	2020
Description	Titania precursor films were electrosprayed on a quartz glass substrate, which was pre-modified with an ultra-thin film obtained by spin-coating a single-walled carbon nanotube (SWCNT) dispersed solution. The X-ray diffraction patterns of the thin films obtained by heat-treating the precursor films at 500 °C in air for 1 h indicated that the formed crystals were anatase. A new route to fabricate transparent thin films on the insulating substrate via electrospray deposition (ESD) was thus attained. The photoluminescence spectrum of the thin film showed a peak at 2.23 eV, assignable to the self-trapped exciton of anatase. The Raman spectrum of the thin film demonstrated that heat treatment is useful for removing SWCNTs. The thin film showed a water contact angle of 14 ± 2° even after being kept under dark conditions for 1 h, indicating a high level of hydrophilicity. Additionally, the thin film had a super-hydrophilic surface with a water contact angle of 1 ± 1° after ultraviolet light irradiation with an intensity of 4.5 mW cm–2 at 365 nm for 1 h. The importance of Ti3+ ions in the co-present amorphous phase, which was dominantly formed via the ESD process, for hydrophilicity was also clarified by means of X-ray photoelectron spectroscopy.
Starting Page	1050
e-ISSN	20796412
DOI	10.3390/coatings10111050
Journal	Coatings
Issue Number	11
Volume Number	10
Language	English
Publisher	MDPI
Publisher Date	2020-10-29
Access Restriction	Open
Subject Keyword	Coatings Coatings and Films Hydrophilic Thin Film Titania Electrospray Deposition Molecular Precursor Method
Content Type	Text
Resource Type	Article

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