Nanoplatelets, identified during the first decade of this century, are a type of two-dimensional colloidal nanocrystals in the shape of plates a few monolayers thick with extended lateral dimensions. More specifically, semiconducting nanoplatelets consisting of 2-D zinc blende cadmium chalcogenides quickly caught the attention of researchers because of their exceptional optical properties. They are strongly fluorescent materials emitting light in a very narrow frequency range, whereby the frequency can be tuned by the number of monolayers. However, up to now, controlling the number of monolayers of thick nanoplatelets proved difficult, and often resulted in mixtures of nanoplatelets with different numbers of mono-layers, making them unsuitable for research.
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