News from across RSC Publishing.
Zooming in on nanoparticles' defects
19 March 2008
US researchers have found a way to study defects on surfaces of nanoparticles, which are thought to be critical for catalytic activity.
Metal nanoparticles are the key to the activity of many catalysts, including those in car catalytic converters. To improve these catalysts it is important to know what is happening at the atomic level. Miguel José-Yacamán and colleagues at the University of Texas at Austin have found that, using microscopy and computer modelling, they can obtain much more detail than before about nanoparticle surface defects.
Gold–palladium nanoparticles show defects on their surface
José-Yacamán says their results show that 'the surface of the particle is rather rough at the atomic scale.' He adds that it is very likely that the stepped surface of these nanoparticles plays an important role in their catalytic activity.
David Cockayne, professor of materials chemistry at the University of Oxford, UK, is enthusiastic about the work, saying that it 'demonstrates the enormous potential for modern aberration-corrected TEM to explore the complex and technologically important structures of nanoparticles.' Luis Liz-Marzàn, an expert in nanoparticles from the University of Vigo in Spain, echoed these thoughts, saying this 'represents a leap in electron microscopy capabilities for nanoparticle analysis.'
Link to journal article
Atomic structure of three-layer Au/Pd nanoparticles revealed by aberration-corrected scanning transmission electron microscopy
Domingo Ferrer, Douglas A. Blom, Lawrence F. Allard, Sergio Mejía, Eduardo Pérez-Tijerina and Miguel José-Yacamán, J. Mater. Chem., 2008, 18, 2442
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