Journal
NANOMATERIALS
Volume 12, Issue 18, Pages -Publisher
MDPI
DOI: 10.3390/nano12183091
Keywords
extinction coefficient; optical spectroscopy; interband transition; plasmon resonance
Categories
Funding
- Ministry of Science and Higher Education of the Russian Federation [122011300061-3]
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This study proposes a new method for determining the concentration of silver atoms in hydrosols of nanoparticles stabilized with different capping agents and confirms its applicability.
In this work, we propose a new method for determining the concentration of silver atoms in hydrosols of nanoparticles (NPs) stabilized with various capping agents. The proposed method is based on the determination of IBT absorption in the UV region (a broad band with a weakly pronounced shoulder at similar to 250 nm). To determine the extinction coefficient at 250 nm, we synthesized silver nanoparticles with average sizes of 5, 10, and 25 nm, respectively. The prepared nanoparticles were characterized by TEM, HRTEM, electron diffraction, XRD, DLS, and UV-Vis spectroscopy. It has been shown that the absorption characteristics of spherical NPs are not significantly influenced by the hydrosol preparation method and the type of stabilizer used. For particles with a size of 5-25 nm, the molar extinction coefficient of Ag0 atoms was found to be equal to 3500 +/- 100 L mol(-1) cm(-1) at a wavelength of 250 nm. The results of the theoretical calculations of the molar extinction coefficients for spherical nanoparticles are in good agreement with the experimental values. ICP-MS analysis confirmed the applicability of this method in the concentration range of 5 x 10(-7)-1 x 10(-4) mol L-1.
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