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How "Hollow" are Hollow Nanoparticles?
MedLine Citation:
PMID:  23360327     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Diamond anvil cell (DAC), synchrotron X-ray diffraction (XRD) and small angle X-ray scattering (SAXS) techniques were used to probe the composition of the inside of the hollow γ-Fe3O4 nanoparticles (NPs). SAXS experiments on 5.2 nm, 13.3 nm, and 13.8 nm hollow-shell γ-Fe3O4 NPs, and 6 nm core/14.8 nm hollow-shell Au/Fe3O4 NPs revealed the significantly high (higher than solvent) electron density of the void inside the hollow shell. In high-pressure DAC experiments using Ne as pressure transmitting medium, formation of nanocrystalline Ne inside of hollow NPs was not detected by XRD, indicating that the oxide shell is impenetrable. Also, FTIR analysis on the solutions of hollow-shell γ-Fe3O4 NPs fragmented upon refluxing showed no evidence of organic molecules from the void inside, excluding the possibility that organic molecules get through the iron oxide shell during synthesis. The high-pressure DAC experiments on Au/Fe3O4 core/hollow-shell NPs showed good transmittance of the external pressure to the gold core, indicating the presence of the pres-sure-transmitting medium in the gap between the core and the hollow shell. Overall, our data reveal the presence of most likely small frag-ments of iron and/or iron oxide in the void of the hollow NPs. Iron oxide shell seems to be non-porous and impenetrable for gas and liquid.
Authors:
Paul Podsiadlo; Soon Gu Kwon; Bonil Koo; Byeongdu Lee; Vitali B Prakapenka; Przemyslaw Dera; Kirill K Zhuravlev; Galyna Krylova; Elena V Shevchenko
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-29
Journal Detail:
Title:  Journal of the American Chemical Society     Volume:  -     ISSN:  1520-5126     ISO Abbreviation:  J. Am. Chem. Soc.     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-30     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  7503056     Medline TA:  J Am Chem Soc     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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