The influence of nanocrystallinity on the electronic and mechanical properties of metal nanoparticles is still poorly understood, due to the difficulty in synthesizing nanoparticles with a controlled internal structure.Here, we report on a new method for the selective synthesis of Au nanoparticles in either a singledomainor a polycrystalline phase maintaining the same chemical environment. We obtain quasi-sphericalnanoparticles whose diameter is tunable from 6 to 13 nm with a resolution down to ≈0.5 nm and narrow size distribution (4–5%). The availability of such high-quality samples allows the study of the impact of the particle size and nanocrystallinity on a number of parameters, such as plasmon dephasing time, electron– phonon coupling, period and damping time of the radial breathing modes.
Source : Size and nanocrystallinity controlled gold nanocrystals: synthesis, electronic and mechanical properties. N. Goubet, I. Tempra, J. Yang, G. Soavi, D. Polli, G. Cerullo and M. P. Pileni Nanoscale, 2015,7, 3237–3246.