Nanometer-scale size dependent imaging of cetyl trimethyl ammonium bromide (CTAB) capped and uncapped gold nanoparticles by apertureless near-field optical microscopy

Yohannes Abate, Adam Schwartzberg, Daniel Strasser, Stephen R. Leone*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

Apertureless near-field scanning optical microscopy (ANSOM) is used to image optical near-field light scattering from uncapped gold nanoparticles and gold nanoparticles capped with the cationic surfactant cetyl trimethyl ammonium bromide (CTAB). The measurements investigate the gold-particle size-dependent signals and the modification of those signals by the spacer layer of commonly used CTAB in the visible at λ = 633 nm. Imaging of capped nanoparticles by apertureless near-field microscopy opens the possibility to predict quantitative layer thicknesses of capping agents on the surface of nanoparticles, as well as the effect of capping layers on the optical scattering properties of nanoparticles.

Original languageAmerican English
Pages (from-to)146-152
Number of pages7
JournalChemical Physics Letters
Volume474
Issue number1-3
DOIs
StatePublished - 25 May 2009
Externally publishedYes

Bibliographical note

Funding Information:
This work was supported by the Director, Office of Basic Energy Sciences, Chemical Sciences, Geosciences, and Biosciences Division, U.S. Department of Energy under Contract No. DE-AC02–05CH11231. Stephen R. Leone gratefully acknowledges the generous support of a Morris Belkin Visiting Professorship at the Weizmann Institute of Science.

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