Journal
APPLIED MATERIALS TODAY
Volume 14, Issue -, Pages 1-20Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apmt.2018.11.005
Keywords
Atomic layer deposition; TiO2 nanotube; Coatings; Functionalization; Aspect ratio
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Funding
- European Research Council [638857]
- Ministry of Youth, Education and Sports of the Czech Republic [LM2015082, LQ16O1]
- Czech Science Foundation [18-03881S]
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Atomic layer deposition (ALD) represents a unique deposition technique that allows to coat uniformly various high aspect ratio (HAR) porous nano structures, in addition to its traditional role to coat flat substrates (e.g. Si wafers). Self-organized anodic TiO2 nanotube (TNT) layers belong among the most investigated inorganic nano structures. They possess highly functional materials with promising application potential across many technological fields. Herein, we review the utilization of ALD for the functionalization of anodic TNT layers by secondary materials to advance their physicochemical and photoelectrochemical properties. First, the application of ALD for functionalization of porous aluminium oxide, which represent fundamental HAR nanostructure, is briefly introduced. Then the main experimental parameters governing the uniformity and the conformality of ALD coating within HAR nanostructures are discussed. Finally, the review focuses on the use of ALD to deposit secondary materials into TNT layers for various purposes - the introduction of pioneering studies is followed by particular examples of ALD based functionalizations of coated TNT layers for optimized visible-light absorption, charge separation and passivation, (photo)catalysis, stability, gas sensing, and energy storage. (C) 2018 The Authors. Published by Elsevier Ltd.
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