Size, Shape, Stability, and Color of Plasmonic Silver Nanoparticles

The remarkable relationship between the size, shape, and optical properties of silver nanoparticles is proving to be very useful in a range of high performance applications. Considerable effort and investment are focused on delivering silver nanoparticles with precise morphologies. However, the reli...

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Published in:Journal of physical chemistry. C 2014-05, Vol.118 (17), p.9128-9136
Main Authors: González, A. L, Noguez, Cecilia, Beránek, J, Barnard, A. S
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Language:English
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description The remarkable relationship between the size, shape, and optical properties of silver nanoparticles is proving to be very useful in a range of high performance applications. Considerable effort and investment are focused on delivering silver nanoparticles with precise morphologies. However, the reliability of these particles is contingent upon the morphological stability, particularly against variations in the thermodynamic environment, such as changes in temperature. Using a combination of computational and theoretical approaches, we have constructed a size- and shape-dependent phase diagram of nanoscale silver and projected the optical emission spectrum to produce a detailed structure/property map at thermal equilibrium. This map demonstrates that faceted near-spherical shapes and spheres are the predominant morphologies in a Ag NPs colloidal sample at low and high temperatures, showing a light yellow color. However, samples with more faceted shapes such as cubes or tetrahedrons, which gain stability at sizes smaller than 8 nm at intermediate temperatures, will present brighter yellow hues and dark red colors, respectively.
doi_str_mv 10.1021/jp5018168
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title Size, Shape, Stability, and Color of Plasmonic Silver Nanoparticles
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