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Issue 14, 2017
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Morphological and chemical transformations of single silica-coated CdSe/CdS nanorods upon fs-laser excitation

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Abstract

Radiation-induced modifications of nanostructures are of fundamental interest and constitute a viable out-of-equilibrium approach to the development of novel nanomaterials. Herein, we investigated the structural transformation of silica-coated CdSe/CdS nanorods (NRs) under femtosecond (fs) illumination. By comparing the same nanorods before and after illumination with different fluences we found that the silica-shell did not only enhance the stability of the NRs but that the confinement of the NRs also led to novel morphological and chemical transformations. Whereas uncoated CdSe/CdS nanorods were found to sublimate under such excitations the silica-coated nanorods broke into fragments which deformed towards a more spherical shape. Furthermore, CdS decomposed which led to the formation of metallic Cd, confirmed by high-resolution electron microscopy and energy dispersive X-ray spectrometry (EDX), whereby an epitaxial interface with the remaining CdS lattice was formed. Under electron beam exposure similar transformations were found to take place which we followed in situ.

Graphical abstract: Morphological and chemical transformations of single silica-coated CdSe/CdS nanorods upon fs-laser excitation

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Article information


Submitted
23 Dec 2016
Accepted
17 Mar 2017
First published
23 Mar 2017

Nanoscale, 2017,9, 4810-4818
Article type
Paper

Morphological and chemical transformations of single silica-coated CdSe/CdS nanorods upon fs-laser excitation

W. Albrecht, B. Goris, S. Bals, E. M. Hutter, D. Vanmaekelbergh, M. A. van Huis and A. van Blaaderen, Nanoscale, 2017, 9, 4810
DOI: 10.1039/C6NR09879G

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