The DOI matches its Crossref record; 17 of the 17 references it cites were found in a registry or an index.
Size-Dependent Melting of Silica-Encapsulated Gold Nanoparticles
Abstract
We report on the size dependence of the melting temperature of silica-encapsulated gold nanoparticles. The melting point was determined using differential thermal analysis (DTA) coupled to thermal gravimetric analysis (TGA) techniques. The small gold particles, with sizes ranging from 1.5 to 20 nm, were synthesized using radiolytic and chemical reduction procedures and then coated with porous silica shells to isolate the particles from one another. The resulting silica-encapsulated gold particles show clear melting endotherms in the DTA scan with no accompanying weight loss of the material in the TGA examination. The silica shell acts as a nanocrucible for the melting gold with little effect on the melting temperature itself, even though the analytical procedure destroys the particles once they melt. Phenomenological thermodynamic predictions of the size dependence of the melting point of gold agree with the experimental observation. Implications of these observations to the self-diffusion coefficient of gold in the nanoparticles are discussed, especially as they relate to the spontaneous alloying of core-shell bimetallic particles.
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Metadata
- Authors
- Dick, K., Dhanasekaran, T., Zhang, Z., & Meisel, D.
- Venue
- Journal of the American Chemical Society
- Publisher
- American Chemical Society (ACS)
- Published
- 2002-02-14
- Volume
- 124
- Issue
- 10
- Pages
- 2312-2317
- ISSN
- 0002-7863 (ISSN-L)
- 1520-5126
- OpenAlex
- W2027748693
- Cited by
- 549
- References
- 17
- FWCI
- 14.31
- Type
- journal article
- Language
- en
- Open access
- closed
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