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Nanoscale phase separation in coated Ag nanoparticles (Articolo in rivista)

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Nanoscale phase separation in coated Ag nanoparticles (Articolo in rivista) (literal)

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Yuri Antonio Diaz-Fernandez, Piersandro Pallavicini, Luca Pasotti, Chiara Milanese, Eva Pellicer, Maria D. Baró, Yang Ren and Lorenzo Malavasi (2011)
Nanoscale phase separation in coated Ag nanoparticles
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Yuri Antonio Diaz-Fernandez, Piersandro Pallavicini, Luca Pasotti, Chiara Milanese, Eva Pellicer, Maria D. Baró, Yang Ren and Lorenzo Malavasi (literal)

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1. Univ Pavia, Dipartimento Chim, Sez Chim Fis M Rolla, INSTM,UdR Pavia, I-27100 Pavia, Italy 2. Univ Pavia, inLAB, Inorgan Nanochem Lab, Dipartimento Chim, I-27100 Pavia, Italy 3. Univ Pavia, CNR, IENI, I-27100 Pavia, Italy 4. Univ Autonoma Barcelona, Dept Fis, Fac Ciencies, E-08193 Bellaterra, Spain 5. Argonne Natl Lab, Adv Photon Source, Argonne, IL 60439 USA (literal)

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Abstract

In this paper we report the structural investigation of cysteine and glutathione capped Ag nanoparticles (NPs) by means of transmission electron microscopy (TEM), synchrotron X-ray diffraction (XRD) and pair distribution function (PDF) analysis. The combined use of these probes allowed us to observe the presence of two crystal structures in the coated AgNPs, i.e., the cubic and the hexagonal crystal structures of Ag. In particular, it was possible to demonstrate that the coated AgNPs are a nanoscale phase separated system where the two phases coexist within the single grain. In addition, the relative bulk amount of the fcc and hcp phases has been estimated and a possible correlation with the capping agent proposed. (literal)

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