Abstract
The synthesis of highly luminescent non-toxic nanocrystals (NCs) and the subsequent phase transfer to aqueous solution by hydrolysis of the crystal-bound ester are presented. Therefore, the synthesis of the spherical semiconductor system InP/ZnS was modified by changing the sulfur precursor in the synthesis from 1-dodecanethiol to dodecyl 3-mercaptopropionate (D3MP). By employing D3MP both as sulfur precursor for the ZnS shell growth and as stabilizing ligand, the phase transfer from organic to aqueous solution can be performed easily. Instead of the usually employed ligand exchange with mercaptopropionic acid, the NCs are only shaken with a sodium borate buffer in order to obtain aqueous soluble NCs by hydrolysis of the ester. In future work, the NCs must be protected against aggregation and the long term stability has to be increased. The optical properties of the samples are investigated by UV/Vis and photoluminescence spectroscopy, and the morphology of the nanoparticles (NPs) before and after phase transfer is determined by transmission electron microscopy.
Acknowledgement
The authors (N.B. and F.L.) are grateful for financial support from the German Federal Ministry of Education and Research (BMBF) within the framework of the program NanoMatFutur, support code 03X5525. Furthermore, the project leading to these results has in part received funding from the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement No. 714429). The authors (D.D., F.L. and D.H.) are grateful for the financial support from Volkswagen foundation (lower Saxony/Israel cooperation, Grant ZN2916). The author D.D. thanks the DFG (research Grant 1580/5-1). R.H. is grateful to Hannover School for Nanotechnology (HSN) for funding. The authors thank Prof. Caro and Prof. Armin Feldhoff for access to powder X-ray diffraction measurements. The authors thank the Laboratorium of Nano- and Quantum Engineering of the Leibniz Universität Hannover for support.
References
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