Impact of nanocrystallinity segregation on the growth and morphology of nanocrystal superlattices
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A colloidal solution of 5 nm Au tetradecanethiol-coated nanoparticles is synthesized. After fast evaporation of one drop, ordered monolayers both composed of single domain and polycrystalline nanocrystals are obtained. On increasing the amount of materials and the evaporation time, nanocrystal films with irregular outlines are produced together with close-packed 3D superlattices exhibiting a truncated-tetrahedral shape. Using low-frequency micro-Raman scattering spectroscopy and electron microscopy the building block nanocrystallinity is characterized. Spontaneous nanocrystallinity segregation is revealed: the truncated-tetrahedral supracrystals are shown to mainly contain single domain building blocks while the supracrystalline films are composed of a mixture of single domain and polycrystalline nanocrystals. This observation points out the correlation between the nanocrystallinity segregation involved in the growth of the nanocrystal superlattices and their morphology.
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Impact of nanocrystallinity segregation on the growth and morphology of nanocrystal superlattices
)
Abstract
A colloidal solution of 5 nm Au tetradecanethiol-coated nanoparticles is synthesized. After fast evaporation of one drop, ordered monolayers both composed of single domain and polycrystalline nanocrystals are obtained. On increasing the amount of materials and the evaporation time, nanocrystal films with irregular outlines are produced together with close-packed 3D superlattices exhibiting a truncated-tetrahedral shape. Using low-frequency micro-Raman scattering spectroscopy and electron microscopy the building block nanocrystallinity is characterized. Spontaneous nanocrystallinity segregation is revealed: the truncated-tetrahedral supracrystals are shown to mainly contain single domain building blocks while the supracrystalline films are composed of a mixture of single domain and polycrystalline nanocrystals. This observation points out the correlation between the nanocrystallinity segregation involved in the growth of the nanocrystal superlattices and their morphology.
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Acknowledgements
The authors thank Dr. I. Arfaoui for fruitful discussion and Dr. P. A. Albouy for SAXRD characterization. Y. F. W., N. G. and M. P. P. contributions to this research have received funding from an Advanced Grant of the European Research Council under grant agreement n°267129.
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