NDLI: Measurement of mean size and evaluation of polydispersity of gold nanoparticles from spectra of optical absorption and scattering

Content Provider	Springer Nature Link
Author	Bogatyrev, V. A. Dykman, L. A. Khlebtsov, B. N. Khlebtsov, N. G.
Copyright Year	2004
Abstract	Two methods for determination of the mean size of gold nanoparticles, based on measurement of the wavelengths of the maxima λ$_{max}$ of side scattering and extinction in the range 400–700 nm, are compared. Four sols with mean particle diameters d of about 15, 20, 25, and 30 nm, measured using the dynamic light-scattering technique, were studied experimentally. The slope of the size dependence λ$_{max}$(d) of the spectral position of the scattering peak exceeded that for the extinction peak by a factor of 2.4. This fact ensures a substantially higher accuracy of the scattering method. For simulating polydispersity, mixtures of three colloids with particle diameters of 20, 25, and 30 nm were used: sample S1, with a size distribution close to the normal one of around 25 nm, and sample S2, with equal concentrations of each of the components. The extinction spectra of mixtures S1 and S2 and the initial 25-nm sol (S0) were virtually identical, whereas their scattering spectra showed a pronounced increase in the peak amplitude in the series S0, S1, S2. These results agree with calculations based on the Mie theory. Thus, scattering spectra offer advantages over extinction spectra not only in measuring the mean size of gold particles but also in evaluating their polydispersity.
Starting Page	128
Ending Page	135
Page Count	8
File Format	PDF
ISSN	0030400X
Journal	Optics and Spectroscopy
Volume Number	96
Issue Number	1
e-ISSN	15626911
Language	English
Publisher	Nauka/Interperiodica
Publisher Date	2014-03-12
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Optics, Optoelectronics, Plasmonics and Optical Devices
Content Type	Text
Resource Type	Article
Subject	Atomic and Molecular Physics, and Optics Electronic, Optical and Magnetic Materials

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