Dewetted Au films form a highly active photocatalytic system on TiO 2 nanotube-stumps

Jeong Eun Yoo; Kiyoung Lee; Patrik Schmuki

doi:10.1016/j.elecom.2013.07.008

Dewetted Au films form a highly active photocatalytic system on TiO ₂ nanotube-stumps

Jeong Eun Yoo, Kiyoung Lee, Patrik Schmuki

Research output: Contribution to journal › Article › peer-review

26 Scopus citations

Abstract

Highly ordered TiO₂ nanotube stump-[TiO₂ NS]-layers, prepared by anodization of Ti in HF/H₃PO₄ solutions, were used as a substrate for a thermal dewetting of Au thin films. Depending on the initial Au sputter-deposited layer thickness, various sizes and densities of gold nanoparticles [Au_np] could be obtained on the TiO₂ NS. Under certain conditions, very homogeneously distributed Au_np (with diameters in the range of 2-15 nm) can be generated. Such Au _np/TiO₂ NS combinations show a high efficiency for H ₂ production from H₂O/EtOH solutions. A maximum H ₂ production efficiency could be obtained from a 2 nm thick Au layer (57.03 μl H₂ for 9 h) that was dewetted to ≈28,000 particles/μm² with individual particle diameters of ≈5 nm.

Original language	English
Pages (from-to)	351-355
Number of pages	5
Journal	Electrochemistry Communications
Volume	34
DOIs	https://doi.org/10.1016/j.elecom.2013.07.008
State	Published - 2013
Externally published	Yes

Bibliographical note

Funding Information:
The authors would like to acknowledge DFG and DFG cluster of excellence EAM for financial support, and H. Hildebrand for valuable technical help.

Keywords

Anodization
Catalysis
Self-organization

Access to Document

10.1016/j.elecom.2013.07.008

Cite this

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title = "Dewetted Au films form a highly active photocatalytic system on TiO 2 nanotube-stumps",

abstract = "Highly ordered TiO2 nanotube stump-[TiO2 NS]-layers, prepared by anodization of Ti in HF/H3PO4 solutions, were used as a substrate for a thermal dewetting of Au thin films. Depending on the initial Au sputter-deposited layer thickness, various sizes and densities of gold nanoparticles [Aunp] could be obtained on the TiO2 NS. Under certain conditions, very homogeneously distributed Aunp (with diameters in the range of 2-15 nm) can be generated. Such Au np/TiO2 NS combinations show a high efficiency for H 2 production from H2O/EtOH solutions. A maximum H 2 production efficiency could be obtained from a 2 nm thick Au layer (57.03 μl H2 for 9 h) that was dewetted to ≈28,000 particles/μm2 with individual particle diameters of ≈5 nm.",

keywords = "Anodization, Catalysis, Self-organization",

author = "Yoo, {Jeong Eun} and Kiyoung Lee and Patrik Schmuki",

note = "Funding Information: The authors would like to acknowledge DFG and DFG cluster of excellence EAM for financial support, and H. Hildebrand for valuable technical help.",

year = "2013",

doi = "10.1016/j.elecom.2013.07.008",

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T1 - Dewetted Au films form a highly active photocatalytic system on TiO 2 nanotube-stumps

AU - Yoo, Jeong Eun

AU - Lee, Kiyoung

AU - Schmuki, Patrik

N1 - Funding Information: The authors would like to acknowledge DFG and DFG cluster of excellence EAM for financial support, and H. Hildebrand for valuable technical help.

PY - 2013

Y1 - 2013

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AB - Highly ordered TiO2 nanotube stump-[TiO2 NS]-layers, prepared by anodization of Ti in HF/H3PO4 solutions, were used as a substrate for a thermal dewetting of Au thin films. Depending on the initial Au sputter-deposited layer thickness, various sizes and densities of gold nanoparticles [Aunp] could be obtained on the TiO2 NS. Under certain conditions, very homogeneously distributed Aunp (with diameters in the range of 2-15 nm) can be generated. Such Au np/TiO2 NS combinations show a high efficiency for H 2 production from H2O/EtOH solutions. A maximum H 2 production efficiency could be obtained from a 2 nm thick Au layer (57.03 μl H2 for 9 h) that was dewetted to ≈28,000 particles/μm2 with individual particle diameters of ≈5 nm.

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