Microstructure and properties of alloyed silver-gold nanoparticles

• Autorzy: Prymak O. , Ristig S. , Meyer-Zaika W. , Raabe D. , Epple M.
• Konferencja: 24th Conference on Biomaterials in medicine and veterinary medicine : 9--12 October 2014, Rytro, Poland
• Języki publikacji: EN

Abstrakty

EN

Alloyed silver-gold nanoparticles recently raised an interest in biomedicine as potential antibacterial and surface-functionalized agents for imaging, drugdelivery, and tumor thermo-therapy [1,2]. The here synthesized alloyed AgAu nanoparticles with different compositions of silver and gold, as determined by atomic absorption spectroscopy (AAS), were prepared by reduction with citrate and tannic acid in aqueous media and subsequently functionalized by the addition of polyvinylpyrrolidone (PVP) [3]. UV spectroscopy confirmed that the particles consisted of alloyed Ag:Au and are not of a separate core-shell structure. The resulting nanoparticles were monodisperse and had a uniform size of ~6 nm, except pure Ag and Ag:Au-90:10, as shown by differential centrifugal sedimentation (DCS) and transmission electron microscopy (TEM). By means of X-ray powder diffraction (XRD) and use of Rietveld refinement [4], the precise lattice parameters, crystallite size and microstrain were determined. Based on the results by XRD, DCS and TEM it was shown, that the nanoparticles were not twinned, except pure Ag and Ag:Au-90:10. Additionally, a distinct deviation from Vegard’s linear rule of alloy mixtures for the lattice parameter was found for the nanoparticles. This effect was also found for AgAu bulk materials, but was much more pronounced in the nanostate. Further investigations of the crystal structure of the alloyed nanoparticles by means of synchrotron radiation might be helpful to gain more information about the interactions of silver and gold atoms.

Słowa kluczowe

EN

nanoparticles; microstructure; alloyed nanoparticles

• Wydawca: Polish Society for Biomaterials in Cracow
• Czasopismo: Engineering of Biomaterials
• Rocznik: 2014
• Tom: Vol. 17, no. 128-129
• Strony: 77
• Opis fizyczny: Bibliogr. 4 poz., wykr.

Twórcy

autor

Prymak O.

• Institute of Inorganic Chemistry and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Essen, Germany

autor

Ristig S.

• Institute of Inorganic Chemistry and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Essen, Germany

autor

Meyer-Zaika W.

• Institute of Inorganic Chemistry and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Essen, Germany

autor

Raabe D.

• Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, 40237 Düsseldorf, Germany

autor

Epple M.

• Institute of Inorganic Chemistry and Center for Nanointegration Duisburg-Essen (CeNIDE), University of Duisburg-Essen, Essen, Germany

Bibliografia

• [1] S. Chernousova, M. Epple, Angewandte Chemie International Edition 52 (2013) 1636
• [2] D. Giljohann, D. Seferos, W. Daniel, M. Massich, P. Patel, C. Mirkin, Angewandte Chemie International Edition 49 (2010) 3280
• [3] D. Mahl, J. Diendorf, S. Ristig, C. Greulich, Zi-An Li, M. Farle, M. Köller, M. Epple, Journal of Nanoparticle Research 14 (2012) 1153
• [4] O. Prymak, S. Ristig, W. Meyer-Zaika, A. Rostek, L. Ruiz, J.M. Gonzalez-Calbet, M. Vallet-Regi, M. Epple, Russian Physics Journal 10 (2014) 1111