Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
Traditional routes to produce two-dimensional (2D) nanoflakes, in particular those made out of transition metal chalcogenides (TMC) include deposition techniques (ALD or CVD) or exfoliation. For the latter one we distinguish mechanical delamination (Scotch tape technique) and mild surfactant based techniques.
We present an approach to mildly exfoliate colloidal layered nanoparticles of group IV, V and VI TMCs, such as ​TiS2, ZrS2, ​NbS2 and ​WSe2. Straight addition of surfactants typically does not lead to exfoliation, but to an increase of the interlayer distance. A tandem approach, where first a short surfactant is offered, followed by a long an bulky one such as oleylamine, offers a mild strategy to produce single-layer nanoflakes.
Surfactants of different head groups can be used to target colloidal synthesis towards single-layer or multi-layer forms MSe2 (M = Mo, W) nanosheets. Here, the surfactant's head group controls the reactivity of the the edges of the nanosheets, and thus the preferred growing direction. While passivation of the edges leads to stackes, keeping the edges reactive and the basal planes soluble allows direct growth of single-layered flakes.
In this talk, emphasis will be given to the theoretical analysis of the solution-based synthesis approach.
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