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XPS and AFM Studies of Monodispersed Pb/PbO Core–Shell Nanostructures

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Abstract:

A probe of the core–shell formation and the interfacial properties of monodispersed 30 nm Pb nanoparticles are presented. A direct correlation between the structures of the particle to its chemical states is done, by a careful Ar+ ion depth profiling followed by X-ray Photoelectron Spectroscopy and Atomic Force Microscopy. The study provides a unique insight into the structure of the nanoparticles. A PbO shell of 4 nm is observed to cover a 15-nm core, with a 5 nm interfacial region. The valence band spectra show the movement of the valence band maxima towards and beyond the Fermi-level during the insulator to metal transition along the particle depth. Evidence is also provided for an enhanced preferential sputtering of the PbO shell and an ion induced penetration of PbO into the Pb core.

Keywords: AFM; CORE-SHELL STRUCTURE; MONODISPERSED; PB/PBO; XPS

Document Type: Research Article

DOI: http://dx.doi.org/10.1166/jnn.2007.776

Publication date: June 1, 2007

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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