Tuning wettability of TiO2 thin film by photocatalytic deposition of 3D flower- and hedgehog-like Au nano- and microstructures

Josiah Shondo; Salih Veziroglu; Dominik Stefan; Yogendra Kumar Mishra; Thomas Strunskus; Franz Faupel; Oral Cenk Aktas

doi:10.1016/j.apsusc.2020.147795

Tuning wettability of TiO₂ thin film by photocatalytic deposition of 3D flower- and hedgehog-like Au nano- and microstructures

Josiah Shondo
, Salih Veziroglu
, Dominik Stefan
, Yogendra Kumar Mishra
, Thomas Strunskus
, Franz Faupel^*
, Oral Cenk Aktas

^*Corresponding author for this work

Christian-Albrechts-University of Kiel
Middle East Technical University

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

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°) 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.

Original language	English
Article number	147795
Journal	Applied Surface Science
Volume	537
ISSN	0169-4332
DOIs	https://doi.org/10.1016/j.apsusc.2020.147795
Publication status	Published - 30. Jan 2021

Funding

J. Shondo thanks DAAD (Deutscher Akademischer Austauschdienst) and PTDF (Petroleum Technology Development Fund) for funding for his doctoral studies. Authors thank to NanoBMT Co. Ltd. for assisting surface wetting analysis.

Keywords

Nano- and microstructure
Photocatalysis
Superhydrophilic
Superhydrophobic
Thin film
TiO

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@article{55aacd2d096e47458df6947500850cf3,

title = "Tuning wettability of TiO2 thin film by photocatalytic deposition of 3D flower- and hedgehog-like Au nano- and microstructures",

abstract = "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°) 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.",

keywords = "Nano- and microstructure, Photocatalysis, Superhydrophilic, Superhydrophobic, Thin film, TiO",

author = "Josiah Shondo and Salih Veziroglu and Dominik Stefan and Mishra, \{Yogendra Kumar\} and Thomas Strunskus and Franz Faupel and Aktas, \{Oral Cenk\}",

note = "Funding Information: J. Shondo thanks DAAD (Deutscher Akademischer Austauschdienst) and PTDF (Petroleum Technology Development Fund) for funding for his doctoral studies. Authors thank to NanoBMT Co. Ltd. for assisting surface wetting analysis. Publisher Copyright: {\textcopyright} 2020 Elsevier B.V. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.",

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doi = "10.1016/j.apsusc.2020.147795",

language = "English",

volume = "537",

journal = "Applied Surface Science",

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T1 - Tuning wettability of TiO2 thin film by photocatalytic deposition of 3D flower- and hedgehog-like Au nano- and microstructures

AU - Shondo, Josiah

AU - Veziroglu, Salih

AU - Stefan, Dominik

AU - Mishra, Yogendra Kumar

AU - Strunskus, Thomas

AU - Faupel, Franz

AU - Aktas, Oral Cenk

N1 - Funding Information: J. Shondo thanks DAAD (Deutscher Akademischer Austauschdienst) and PTDF (Petroleum Technology Development Fund) for funding for his doctoral studies. Authors thank to NanoBMT Co. Ltd. for assisting surface wetting analysis. Publisher Copyright: © 2020 Elsevier B.V. Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2021/1/30

Y1 - 2021/1/30

N2 - 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°) 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.

AB - 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°) 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.

KW - Nano- and microstructure

KW - Photocatalysis

KW - Superhydrophilic

KW - Superhydrophobic

KW - Thin film

KW - TiO

U2 - 10.1016/j.apsusc.2020.147795

DO - 10.1016/j.apsusc.2020.147795

M3 - Journal article

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VL - 537

JO - Applied Surface Science

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