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      Determination of Size and Concentration of Gold Nanoparticles from UV−Vis Spectra

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          Abstract

          The dependence of the optical properties of spherical gold nanoparticles on particle size and wavelength were analyzed theoretically using multipole scattering theory, where the complex refractive index of gold was corrected for the effect of a reduced mean free path of the conduction electrons in small particles. To compare these theoretical results to experimental data, gold nanoparticles in the size range of 5 to 100 nm were synthesized and characterized with TEM and UV-vis. Excellent agreement was found between theory and experiment. It is shown that the data produced here can be used to determine both size and concentration of gold nanoparticles directly from UV-vis spectra. Equations for this purpose are derived, and the precision of various methods is discussed. The major aim of this work is to provide a simple and fast method to determine size and concentration of nanoparticles.

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          Optical Properties of Metal Clusters

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            Absorption and Scattering of Light by Small Particles

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              Solid State Physics

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                Author and article information

                Journal
                Analytical Chemistry
                Anal. Chem.
                American Chemical Society (ACS)
                0003-2700
                1520-6882
                June 01 2007
                April 26 2007
                June 01 2007
                : 79
                : 11
                : 4215-4221
                Affiliations
                [1 ]Centre for Nanoscale Science, Department of Chemistry, University of Liverpool, Crown Street L69 7ZD, U.K., and School of Biological Sciences, University of Liverpool, Crown Street L69 7ZB, U.K.
                Article
                10.1021/ac0702084
                17458937
                79a674f8-65ef-40c8-90ee-83ea91656681
                © 2007
                History

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