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Nanomaterials 2017, 7(5), 97;

Synthesis of Pt@TiO2@CNTs Hierarchical Structure Catalyst by Atomic Layer Deposition and Their Photocatalytic and Photoelectrochemical Activity

Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu 300, Taiwan
Author to whom correspondence should be addressed.
Academic Editor: Thomas Nann
Received: 1 March 2017 / Revised: 20 April 2017 / Accepted: 26 April 2017 / Published: 29 April 2017
(This article belongs to the Special Issue Noble Metal Nanoparticles in Catalysis)
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Pt@TiO2@CNTs hierarchical structures were prepared by first functionalizing carbon nanotubes (CNTs) with nitric acid at 140 °C. Coating of TiO2 particles on the CNTs at 300 °C was then conducted by atomic layer deposition (ALD). After the TiO2@CNTs structure was fabricated, Pt particles were deposited on the TiO2 surface as co-catalyst by plasma-enhanced ALD. The saturated deposition rates of TiO2 on a-CNTs were 1.5 Å/cycle and 0.4 Å/cycle for substrate-enhanced process and linear process, respectively. The saturated deposition rate of Pt on TiO2 was 0.39 Å/cycle. The photocatalytic activities of Pt@TiO2@CNTs hierarchical structures were higher than those without Pt co-catalyst. The particle size of Pt on TiO2@CNTs was a key factor to determine the efficiency of methylene blue (MB) degradation. The Pt@TiO2@CNTs of 2.41 ± 0.27 nm exhibited the best efficiency of MB degradation. View Full-Text
Keywords: CNT; ALD; co-catalyst; TiO2; photodegradation CNT; ALD; co-catalyst; TiO2; photodegradation

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Liao, S.-Y.; Yang, Y.-C.; Huang, S.-H.; Gan, J.-Y. Synthesis of Pt@TiO2@CNTs Hierarchical Structure Catalyst by Atomic Layer Deposition and Their Photocatalytic and Photoelectrochemical Activity. Nanomaterials 2017, 7, 97.

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