Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
Ultrathin two-dimensional nanosheets raise a rapidly increasing interest due to their unique dimensionality-dependent properties. Most of the two-dimensional materials are obtained by exfoliation of layered bulk materials or are grown on substrates by vapor deposition methods. To produce free-standing nanosheets with defined phase and shape, solution-based colloidal methods are emerging as promising routes. In this work, we demonstrate ultrathin CdSe nanosheets with controllable shape and phase. The key of our approach is the use of 1-bromoheptane as additional precursor in a hot-injection synthesis. Increasing concentrations of 1-bromoheptane can tune the shape from sexangular to quadrangular to triangular and the phase from zinc blende to wurtzite. The in situ formed bromide acts as a cadmium complexing agent and as a surface ligand. The replacement of acetate and oleate leads to a change in the reaction kinetics and alters the shape and phase of the nanosheets. The structural and optical properties of the resulting CdSe NSs are characterized by transmission electron microscopy, UV-vis absorption, fluorescence, X-ray diffraction and X-ray photoelectron spectroscopy.
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