Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
Complex semiconductor nanostructures of the group II-VI such as seeded nanorods have recently attracted attention due to their unique luminescent properties such as high fluorescence quantum yield, narrow emission bands and polarized emission. These features are interesting tools for applications including quantum-dot-based displays and photovoltaics. Recently impressive progress on core-shell colloidal nanorods synthesis has been made thanks to ligand controlled growth resulting in high quality nanostructures with different shapes and compositions prepared by hot injection seeded growth [1] and slow-injection technique [2]. The following step in the nanocrystals synthesis development is combining some of these approaches to realize epitaxial growth of additional outer ZnS shell, which raises photochemical stability, reduces environmental and cytotoxic effects and extends the range of applications of semiconductor nanorods for biolabeling probes [3].
In our approach, the CdSe/CdS/ZnS seeded nanorods have been synthesized by wet chemistry methods. CdSe cores were prepared by hot injection technique resulting in narrow size distribution followed by seeded growth of CdS shell. Different CdSe seeds concentrations were used for precise control of nanorods length. Strong dependence of luminescence quantum yield and fluorescence anisotropy have been observed for samples with various length. Additional ZnS shell was grown on top of CdSe/CdS nanorods by application of slow-injection technique using zinc oleate and octanethiol instead of metal-organic precursors [3]. Samples were characterized by transmission electron microscopy (TEM), as well as optical spectroscopy such as absorption (ABS), photoluminescence (PL), and time stability of PL.
[1] L. Carbone, et al., Nano Lett. 7, 2942–2950 (2007)
[2] I. Coropceanu, et al., ACS Nano 10, 3295–3301 (2016)
[3] S. Deka, et al., J. Am. Chem. Soc. 131, 2948–2958 (2009)
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