Surface properties of sprayed and electrodeposited ZnO rod layers
| Autor: | Inga Gromyko, Deniss Klauson, I. Oja Acik, Tatjana Dedova, Malle Krunks, Atanas Katerski |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Morphology (linguistics) genetic structures General Physics and Astronomy Nanotechnology 02 engineering and technology 010402 general chemistry 01 natural sciences Rod Contact angle symbols.namesake X-ray photoelectron spectroscopy Superhydrophilicity Surfaces and Interfaces General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Surfaces Coatings and Films symbols Photocatalysis sense organs Wetting 0210 nano-technology Raman spectroscopy Nuclear chemistry |
| Zdroj: | Applied Surface Science. 405:521-528 |
| ISSN: | 0169-4332 |
| DOI: | 10.1016/j.apsusc.2017.02.065 |
| Popis: | Herein we present a comparative study on as-deposited, two-month-stored, and heat-treated ZnO rods obtained by spray pyrolysis (SP) at 550 °C, and electrodeposition (ED) at 80 °C. The aim of the study is to establish the reason for different behaviour of wettability and photocatalytic activity (PA) of SP and ED rods. Samples were studied using XPS, SEM, XRD, Raman, contact angle (CA) measurements and photocatalytic oxidation of doxycycline. Wettability and PA are mainly controlled by surface composition rather than by morphology. The relative amount of hydroxyl groups on the surface of as-deposited ED rods is four times higher compared to as-deposited SP rods. Opposite to SP rods, ED rods contain oxygen vacancy defects (Vo). Therefore, as-deposited ED rods are superhydrophilic (CA ∼ 3°) and show highest PA among studied samples, being three times higher compared to SP rods (removing of 75% of doxycycline after 30 min). It was revealed that as-deposited ED rods are inclined to faster contamination. The amount of C C groups on the surface of aged ED rods is six times higher compared to aged SP rods. Stored ED samples become hydrophobic (CA ∼ 120°) and PA decreases sharply while SP rods remain hydrophilic (CA ∼ 50°), being more resistive to the contamination. |
| Databáze: | OpenAIRE |
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