Process-Induced Nanostructures on Anatase Single Crystals via Pulsed-Pressure MOCVD
| Autor: | Catherine M. Bishop, Rukmini Gorthy, Susan Krumdieck |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Mass flux
Anatase Materials science Nanostructure Chemical vapor deposition competitive growth engineering.material lcsh:Technology Article Crystal pp-MOCVD Coating General Materials Science Metalorganic vapour phase epitaxy lcsh:Microscopy process-induced nanostructures lcsh:QC120-168.85 lcsh:QH201-278.5 lcsh:T business.industry anatase single crystals lcsh:TA1-2040 Photocatalysis engineering Optoelectronics lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering lcsh:Engineering (General). Civil engineering (General) business lcsh:TK1-9971 |
| Zdroj: | Materials, 13(7):1668 Materials Volume 13 Issue 7 Materials, Vol 13, Iss 1668, p 1668 (2020) |
| Popis: | 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&ndash 16 mm, 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&ndash 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. |
| Databáze: | OpenAIRE |
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