X-ray Photoelectron Spectroscopy of Isolated Nanoparticles
The Journal of Physical Chemistry Letters2014Vol. 5(19), pp. 3399–3403
Citations Over TimeTop 12% of 2014 papers
O. Sublemontier, Christophe Nicolas, Damien Aureau, Minna Patanen, Harold Kintz, Xiao-Jing Liu, M.‐A. Gaveau, Jean-Luc Le Garrec, Emmanuel Robert, Flory-Anne Barreda, Arnaud Etchéberry, Cécile Reynaud, James B. Mitchell, Catalin Miron
Abstract
X-ray photoelectron spectroscopy (XPS) is a very efficient and still progressing surface analysis technique. However, when applied to nano-objects, this technique faces drawbacks due to interactions with the substrate and sample charging effects. We present a new experimental approach to XPS based on coupling soft X-ray synchrotron radiation with an in-vacuum beam of free nanoparticles, focused by an aerodynamic lens system. The structure of the Si/SiO2 interface was probed without any substrate interaction or charging effects for silicon nanocrystals previously oxidized in ambient air. Complete characterization of the surface was obtained. The Si 2p core level spectrum reveals a nonabrupt interface.
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