Solvent and stabilizer free growth of Ag and Pd nanoparticles using metallic salts/cyclotriphosphazenes mixtures
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Díaz Valenzuela, Carlos
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Solvent and stabilizer free growth of Ag and Pd nanoparticles using metallic salts/cyclotriphosphazenes mixtures
Abstract
Cyclotriphosphazene is used as a sacrificial solid-state template to synthesize a range of Ag and Pd
nanoparticles with diverse geometries by thermal treatment using MLn/N3P3(O2C12H8)3 mixtures. The Pd
and Ag nanoparticles are synthesized by solid-state pyrolysis of AgPPh3[CF3SO3]/N3P3(O2C12H8)3 and
PdCl2/N3P3(O2C12H8)3 mixtures with molar relationships of 1:1, 1:5 and 1:10 respectively, in air and at
800 C. The morphology of the as-prepared nanoparticles is found to depend on the molar ratio of the
precursor mixture, the preparation method and of the nature of the metal. Ag and Pd, microcrystals were
thermally grown on Si from the respective 1:1 precursors while that metal foams were grown from 1:5
ratios precursors on SiO2 wafers. High resolution transmission electron microscopy investigations reveal
in most cases small crystals of Pd. HRSTEM measurements indicate that the formation of the Pd and Ag
nanoparticles occurs through a phase demixing and dewetting mechanism. This approach has potential
to be a useful and facile method to prepare metallic nanoparticles without requiring solutions or surfactants
for application in electronic, catalytic and sensor materials and devices.
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Artículo de publicación ISI
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URI: https://repositorio.uchile.cl/handle/2250/119684
DOI: DOI: 10.1016/j.matchemphys.2013.08.034
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Materials Chemistry and Physics 143 (2013) 124e132
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