ZnO nanocrystallites obtained by oxidation of zinc arachidate - arachidic acid composite multilayers
| Autor: | Raman S. Srinivasa, S.S. Major, Sukhvinder Singh, S.S. Talwar |
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| Rok vydání: | 2007 |
| Předmět: |
Materials science
Analytical chemistry chemistry.chemical_element Surfaces and Interfaces Zinc Condensed Matter Physics Langmuir–Blodgett film Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound Chemical engineering chemistry Nanocrystal Monolayer Materials Chemistry Arachidic acid Nanorod Mica Electrical and Electronic Engineering Fourier transform infrared spectroscopy |
| Zdroj: | physica status solidi (a). 204:1658-1664 |
| ISSN: | 1862-6319 1862-6300 |
| DOI: | 10.1002/pssa.200675304 |
| Popis: | ZnO nanocrystallites were prepared by the oxidation of Zinc Arachidate-Arachidic Acid (ZnA-AA) composite multilayers grown on quartz and freshly cleaved mica substrates. Control of zinc content in the multilayers was achieved by the manipulation of the subphase pH and the variation in the number of monolayers transferred. FTIR studies of multilayers show a gradual decrease in ZnA content as the subphase pH is reduced. X-ray reflection studies show the presence of a single layered structure in all the asdeposited multilayers transferred at different subphase pH. These observations suggest molecular level mixing of ZnA and arachidic acid molecules. The precursor multilayers were oxidized in the temperature range of 100-700 °C. The formation of ZnO is confirmed by UV-Visible spectroscopy. Atomic force micrographs show that the oxidation treatment resulted in either large agglomerates of ZnO nanocrystallites or isolated nanocrystallites, depending on the zinc content of the precursor multilayers. Typically, 7 monolayers ZnA-AA transferred at subphase pH of 5.0 on mica and oxidized at 700 °C resulted in uniformly distributed, isolated and nearly mono-dispersed nanocrystallites of size 11 ± 3 nm. |
| Databáze: | OpenAIRE |
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