SURFACE CHEMISTRY

Standing differently on nanoparticles

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Science  10 Jul 2015:
Vol. 349, Issue 6244, pp. 151-152
DOI: 10.1126/science.349.6244.151-d

Bonding of molecules on a metal surface might be expected to be the same whether the surface is a single crystal or a large nanoparticle. Yim et al. studied the adsorption of carbon monoxide (CO) on curved palladium (Pd) nanoparticles (20 to 30 nm across) grown on titanium dioxide and exposing the hexagonal (111) surface. They observed regions with CO in an atop bridge binding site with scanning tunneling microscopy, and tilting of CO from the surface normal in x-ray spectroscopy, features not seen on bulk Pd (111) surfaces. Theoretical calculations attribute these changes to strain in the nanoparticle.

Proc. Natl. Acad. Sci. U.S.A. 10.1073/pnas.1506939112 (2015).

Lattice of supported Pd nanoparticles used to study CO adsorption

PHOTO: C. M. YIM ET AL., PNAS 112 26, (30 JUNE 2015) © 2015 NATIONAL ACADEMY OF SCIENCES

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