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- W2042731134 abstract "This work exposes the study of the nucleation and growth of gold nanoparticles at a temperature of 25 °C induced by the spontaneous oxidation at room temperature of the ZrAu crystallized alloy. In this rich gold original system, the starting gold nuclei are produced by the degradation of the ZrAu crystal structure by atmospheric oxygen (selective oxidation of zirconium). The nucleation-growth mechanism has been followed by X-ray diffraction and described with the Johnson−Mehl−Avrami−Kolmogorov (JMAK) model. From the JMAK calculation and the Rietveld analysis, it has been shown that this mechanism could be decomposed in two steps: a nucleation regime followed by a thickening of the particles formed during the first step. The growth model interpretation by the Avrami analysis has been verified thanks to the study of the evolution of crystallite dimensions during 1 year at room temperature and also by transmission electron microscopy obervations. Microstructural analysis has allowed a determination of the mean size of gold nanoparticles (about 3 nm in diameter after 10 days). This association of very fine particles of ZrO2 and Au could open plenty of perspectives in the field of catalysis sensors because of the nanosized scale." @default.
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- W2042731134 date "2005-11-01" @default.
- W2042731134 modified "2023-10-17" @default.
- W2042731134 title "Evolution in Time of a Gold−Zirconia Nanopowder at Room Temperature: Nucleation Growth of Gold Nanoparticles" @default.
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- W2042731134 doi "https://doi.org/10.1021/cm040187j" @default.
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