Configuration of microbially synthesized Pd-Au nanoparticles studied by STEM-based techniques.
Nanotechnology
; 23(5): 055701, 2012 Feb 10.
Article
em En
| MEDLINE
| ID: mdl-22236722
ABSTRACT
Bimetallic Pd-Au particles synthesized using Desulfovibrio desulfuricans bacteria are characterized using scanning transmission electron microscopy (STEM) with a high-angle annular dark field (HAADF) detector combined with energy dispersive x-ray (EDX) silicon drift detector (SDD) elemental mapping and plasmon electron energy-loss spectroscopy (EELS). When combined with EDX, theoretical considerations or EELS, the atomic-number contrast (Z-contrast) provided by HAADF-STEM is effective in characterizing the compositional configuration of the bimetallic nanoparticles. Homogeneous mixing and complex segregations have been found for different particles in this work. The EELS study has also found different behaviours corresponding to surface plasmon resonances in different regions of a single particle due to its heterogeneity and anisotropy. HAADF-STEM tomography has been performed to obtain three-dimensional (3D) visualization of the nanoparticles.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Paládio
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Microscopia Eletrônica de Transmissão e Varredura
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Desulfovibrio desulfuricans
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Nanopartículas Metálicas
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Ouro
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article