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An investigation of the structure of stearate monolayers on Au@ZrO 2 and Ag@ZrO2 core-shell nanoparticles

Publication Type : Journal Article

Publisher : Journal of Materials Chemistry

Source : Journal of Materials Chemistry, Volume 14, Number 5, p.857-862 (2004)

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Keywords : article, catalysis, catalyst, chemical analysis, gold complex, Gold compounds, Materials science, Microscopic examination, molecular interaction, molecular physics, Monolayers, nanoparticle, Nanoparticles, Nanostructured materials, Organic solvents, Photophysics, silver derivative, Spectroscopic analysis, stearic acid, synthesis, thermal analysis, Thermoanalysis, zirconium oxide

Campus : Chennai

School : Center for Nanosciences

Department : Nanosciences and Molecular Medicine

Year : 2004

Abstract : Monolayer protected nanoparticles, Au@ZrO2@stearate and Ag@ZrO2@stearate, in which the core-shell nanoparticles, Au@ZrO 2 and Ag@ZrO2 (ZrO2 coated Au and Ag nanoparticles) are functionalized with stearic acid, have been synthesized and characterized. The air-dried powders, freely dispersible in several organic solvents (both polar and non-polar), are stable for extended periods. The materials were characterized by spectroscopic, microscopic, diffraction and thermal analysis techniques. The monolayer cover is stable up to 200°C. Monolayers do not exhibit strong inter-chain interactions, unlike in the case of those on metal nanoparticles, suggesting that their surface anchoring sites are widely spaced. As a result, temperature-dependent infrared spectra of the monolayers are featureless. The oxide surface is accessible for small molecules in solution even after stearic acid coverage. Freely dispersible nanoparticles with oxide shells may offer new possibilities in catalysis, photophysics and materials science.

Cite this Research Publication : A. S. Nair, Pradeep, T., and MacLaren, I., “An investigation of the structure of stearate monolayers on Au@ZrO 2 and Ag@ZrO2 core-shell nanoparticles”, Journal of Materials Chemistry, vol. 14, pp. 857-862, 2004.

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