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Open AccessArticle

Process-Induced Nanostructures on Anatase Single Crystals via Pulsed-Pressure MOCVD

Department of Mechanical Engineering, College of Engineering, University of Canterbury, 20 Kirkwood Ave, Christchurch 8041, New Zealand
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Materials 2020, 13(7), 1668; https://doi.org/10.3390/ma13071668
Received: 1 March 2020 / Revised: 27 March 2020 / Accepted: 1 April 2020 / Published: 3 April 2020
(This article belongs to the Special Issue Advances in Chemical Vapor Deposition)
The recent global pandemic of COVID-19 highlights the urgent need for practical applications of anti-microbial coatings on touch-surfaces. Nanostructured TiO2 is a promising candidate for the passive reduction of transmission when applied to handles, push-plates and switches in hospitals. Here we report control of the nanostructure dimension of the mille-feuille crystal plates in anatase columnar crystals as a function of the coating thickness. This nanoplate thickness is key to achieving the large aspect ratio of surface area to migration path length. TiO2 solid coatings were prepared by pulsed-pressure metalorganic chemical vapor deposition (pp-MOCVD) under the same deposition temperature and mass flux, with thickness ranging from 1.3–16 μm, by varying the number of precursor pulses. SEM and STEM were used to measure the mille-feuille plate width which is believed to be a key functional nano-dimension for photocatalytic activity. Competitive growth produces a larger columnar crystal diameter with thickness. The question is if the nano-dimension also increases with columnar crystal size. We report that the nano-dimension increases with the film thickness, ranging from 17–42 nm. The results of this study can be used to design a coating which has co-optimized thickness for durability and nano-dimension for enhanced photocatalytic properties. View Full-Text
Keywords: anatase single crystals; process-induced nanostructures; competitive growth; pp-MOCVD anatase single crystals; process-induced nanostructures; competitive growth; pp-MOCVD
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Gorthy, R.; Krumdieck, S.; Bishop, C. Process-Induced Nanostructures on Anatase Single Crystals via Pulsed-Pressure MOCVD. Materials 2020, 13, 1668.

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