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Issue 25, 2015
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Dominant luminescence is not due to quantum confinement in molecular-sized silicon carbide nanocrystals

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Abstract

Molecular-sized colloid silicon carbide (SiC) nanoparticles are very promising candidates to realize bioinert non-perturbative fluorescent nanoparticles for in vivo bioimaging. Furthermore, SiC nanoparticles with engineered vacancy-related emission centres may realize magneto-optical probes operating at nanoscale resolution. Understanding the nature of molecular-sized SiC nanoparticle emission is essential for further applications. Here we report an efficient and simple method to produce a relatively narrow size distribution of water soluble molecular-sized SiC nanoparticles. The tight control of their size distribution makes it possible to demonstrate a switching mechanism in the luminescence correlated with particle size. We show that molecular-sized SiC nanoparticles of 1–3 nm show a relatively strong and broad surface related luminescence whilst the larger ones exhibit a relatively weak band edge and structural defect luminescence with no evidence of quantum confinement effect.

Graphical abstract: Dominant luminescence is not due to quantum confinement in molecular-sized silicon carbide nanocrystals

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Supplementary files

Article information


Submitted
21 Feb 2015
Accepted
21 May 2015
First published
25 May 2015

This article is Open Access

Nanoscale, 2015,7, 10982-10988
Article type
Communication
Author version available

Dominant luminescence is not due to quantum confinement in molecular-sized silicon carbide nanocrystals

D. Beke, Z. Szekrényes, Z. Czigány, K. Kamarás and Á. Gali, Nanoscale, 2015, 7, 10982
DOI: 10.1039/C5NR01204J

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    [Original citation] - Published by The Royal Society of Chemistry.

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