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Nanomaterials 2017, 7(5), 97; doi:10.3390/nano7050097

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
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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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Abstract

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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