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Issue 28, 2011
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Electronic structure of sub-10 nm colloidal silicananoparticles measured by in situphotoelectron spectroscopy at the aqueous-solid interface

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Abstract

X-Ray photoelectron spectroscopy has been extended to colloidal nanoparticles in aqueous solution using a liquid microjet in combination with synchrotron radiation, which allowed for depth-dependent measurements. Two distinct electronic structures are evident in the Si 2p photoelectron spectrum of 7 nm SiO2-nanoparticles at pH 10. A core-shell model is proposed where only the outermost layer of SiO2 nanoparticles, which is mainly composed of deprotonated silanol groups, >Si–O, interacts with the solution. The core of the nanoparticles is not affected by the solvation process and retains the same electronic structure as measured in vacuum. Future opportunities of this new experiment are also highlighted.

Graphical abstract: Electronic structure of sub-10 nm colloidal silica nanoparticles measured by in situphotoelectron spectroscopy at the aqueous-solid interface

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Article information


Submitted
11 Apr 2011
Accepted
07 Jun 2011
First published
20 Jun 2011

Phys. Chem. Chem. Phys., 2011,13, 12720-12723
Article type
Communication

Electronic structure of sub-10 nm colloidal silica nanoparticles measured by in situphotoelectron spectroscopy at the aqueous-solid interface

M. A. Brown, R. Seidel, S. Thürmer, M. Faubel, J. C. Hemminger, J. A. van Bokhoven, B. Winter and M. Sterrer, Phys. Chem. Chem. Phys., 2011, 13, 12720
DOI: 10.1039/C1CP21131E

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