Hydrophilic Titania Thin Films from a Molecular Precursor Film Formed via Electrospray Deposition on a Quartz Glass Substrate Precoated with Carbon Nanotubes
| Autor: | Ryuhei Ozawa, Yutaka Suwazono, Mitsunobu Sato, Yukihiro Kudoh, Natangue Heita Shafudah, Taiju Takahashi, Hiroki Nagai, Takeyoshi Onuma |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
electrospray deposition
Anatase Materials science 02 engineering and technology Substrate (electronics) Carbon nanotube 010402 general chemistry 01 natural sciences law.invention Contact angle symbols.namesake X-ray photoelectron spectroscopy law Materials Chemistry Ultraviolet light titania Thin film Surfaces and Interfaces 021001 nanoscience & nanotechnology 0104 chemical sciences Surfaces Coatings and Films hydrophilic thin film Chemical engineering molecular precursor method lcsh:TA1-2040 symbols 0210 nano-technology Raman spectroscopy lcsh:Engineering (General). Civil engineering (General) |
| Zdroj: | Coatings, Vol 10, Iss 1050, p 1050 (2020) Coatings Volume 10 Issue 11 |
| ISSN: | 2079-6412 |
| Popis: | 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&ndash 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. |
| Databáze: | OpenAIRE |
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