Tuning wettability of TiO2 thin film by photocatalytic deposition of 3D flower- and hedgehog-like Au nano- and microstructures
APPLIED SURFACE SCIENCE, cilt.537, 2021 (SCI-Expanded, Scopus)
- Yayın Türü: Makale / Tam Makale
- Cilt numarası: 537
- Basım Tarihi: 2021
- Doi Numarası: 10.1016/j.apsusc.2020.147795
- Dergi Adı: APPLIED SURFACE SCIENCE
- Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, PASCAL, Aerospace Database, Chemical Abstracts Core, Communication Abstracts, INSPEC, Metadex, Civil Engineering Abstracts
- Anahtar Kelimeler: Photocatalysis, TiO2, Thin film, Nano- and microstructure, Superhydrophobic, Superhydrophilic, SELF-ASSEMBLED MONOLAYERS, SURFACES, XPS, NANOSTRUCTURES, CONVERSION, OXIDE, ACID
- Orta Doğu Teknik Üniversitesi Adresli: Hayır
Özet
We propose a two-steps photocatalytic deposition method to synthesize hierarchical Au nano- and microstructures on TiO2 surface. While the first deposition leads to the formation of flower-like Au microstructures on a highly active TiO2 thin film, needle-like sharp Au nanostructures are grown on the former Au microstructures after the second deposition. TiO2 surface decorated with hierarchical Au structures exhibits a superhydrophilic state with a contact angle (CA) below 5. After the modification of Au-TiO2 surface by octadecyl-phosphonic acid (ODP)-self-assembly monolayer (SAM), an extreme water-repellency (with CA > 163 degrees) is achieved which retains its stability even after multiple low-high temperature cycles. The spatially controlled photocatalytic decomposition of OPD-SAM on TiO2 thin film allows a superhydrophilic-superhydrophobic patterning which may open lot of application avenues in microfluidics, oil-water separation including in water harvesting technologies.