Fabrication of Cu2O@Cu2O core–shell nanoparticles and conversion to Cu2O@Cu core–shell nanoparticles in solution
| Autor: | Yu-jin Wang, Shun-pin Li, Lele Wang, Ailing Yang, Xichang Bao, Renqiang Yang |
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| Rok vydání: | 2015 |
| Předmět: |
Materials science
Metals and Alloys Nucleation Shell (structure) Nanoparticle Nanotechnology Geotechnical Engineering and Engineering Geology Condensed Matter Physics Ascorbic acid Nanocrystalline material Metal Chemical engineering visual_art Materials Chemistry visual_art.visual_art_medium Fourier transform infrared spectroscopy Localized surface plasmon |
| Zdroj: | Transactions of Nonferrous Metals Society of China. 25:3643-3650 |
| ISSN: | 1003-6326 |
| DOI: | 10.1016/s1003-6326(15)64005-5 |
| Popis: | Cu2O@Cu2O core-shell nanoparticles (NPs) were prepared by using solution phase strategy. It was found that Cu2O@Cu2O NPs were easily converted to Cu2O@Cu NPs with the help of polyvinylpyrrolidine (PVP) and excessive ascorbic acid (AA) in air at room temperature, which was an interesting phenomenon. The features of the two kinds of NPs were characterized by XRD, TEM and extinction spectra. Cu2O@Cu NPs with different shell thicknesses showed wide tunable optical properties for the localized surface plasmon (LSP) in metallic Cu. But Cu2O@Cu2O NPs did not indicate this feature. FTIR results reveal that Cu+ ions on the surface of Cu2O shell coordinate with N and O atoms in PVP and are further reduced to metallic Cu by excessive AA and then form a nucleation site on the surface of Cu2O nanocrystalline. PVP binds onto different sites to proceed with the reduction utill all the Cu sources in Cu2O shell are completely assumed. |
| Databáze: | OpenAIRE |
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