Extinction coefficient of gold nanoparticles with different sizes and different capping ligands

    Authors

    X. O. Liu; M. Atwater; J. H. Wang;Q. Huo

    Comments

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    Abbreviated Journal Title

    Colloid Surf. B-Biointerfaces

    Keywords

    gold nanoparticle; extinction coefficient; monolayer; concentration; oleylamine; RESONANCES; SCATTERING; CHEMISTRY; PROBES; DNA; Biophysics; Chemistry, Physical; Materials Science, Biomaterials

    Abstract

    Extinction coefficients of gold nanoparticles with core size ranging from similar to 4 to 40 nm were determined by high resolution transmission electron microscopy analysis and UV-vis absorption spectroscopic measurement. Three different types of gold nanoparticles were prepared and studied: citrate-stabilized nanoparticles in five different sizes; oleylamide-protected gold nanoparticles with a core diameter of 8 nm, and a decanethiolprotected nanoparticles with a diameter of around 4 nm. A linear relationship between the logarithms of extinction coefficients and core diameters of bold particles was found independent of the capping ligands on the particle surface and the solvents used to dissolve the nanoparticles. This linear relation may be used as a calibration curve to determine the concentration or average size of an unknown nanoparticle or nanoparticle-biomolecule conjugate sample. (c) 2006 Elsevier B.V. All rights reserved.

    Journal Title

    Colloids and Surfaces B-Biointerfaces

    Volume

    58

    Issue/Number

    1

    Publication Date

    1-1-2007

    Document Type

    Article; Proceedings Paper

    Language

    English

    First Page

    3

    Last Page

    7

    WOS Identifier

    WOS:000247810600002

    ISSN

    0927-7765

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