Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
Effect of drying conditions on the formation of 2 dimensional PbSe nanocrystals formed via oriented attachment.
Self-assembly is an intriguing process in which long range ordering can be achieved without the cost of an expensive top-down procedures. In the last decades, researcher could arrange NCs in a wide variety of 2 and 3D structures. Recently it became clear that SA can be combined with oriented attachment to make complex crystalline materials [1]. These materials can possess very small periodicities which cannot be reached by todays lithographic techniques. Especially, 2 dimensional (2D) materials made out of heavy atoms gets a lot of attention. This is due to the combination of exciting band structures with the tune ability of nanomaterials. Until now there are two 2D materials made with a such a small nano-periodicity, namely the square and honeycomb structure [2]. The honeycomb structure is the most appealing of the two, due to its similarity with graphene [3]. It appears however, that making this structure is not well understood and therefore very irreproducible. Since both structures can be made with exactly the same NCs, which attach in the same direction, it became clear that the self-assembly prior to OA plays a key role in the determining which structure will form[4]. To control the self-assembly of PbSe NCs on ethelyne glycol, we used a reactor inside a glovebox. Due to this controlled and confined atmosphere, it became possible to grow these materials under different saturation levels of the solvent. Like in 3D self-assembled NCs [5] also here the solvent saturation plays a key role in the self-assembly of the NCs and subsequently the formed structure. The results show that high solvent vapour is necessary to form honeycomb structures, while a atmosphere clean of solvents yield square structures.
References
[1] H. Cölfen et al. Angew. Chemie Int. Ed., vol. 44, no. 35, pp. 5576–5591, 2005.
[2] W. H. Evers, et al, Nano Lett., vol. 13, no. 6, pp. 2317–2323, 2013.
[3] E. Kalesaki,et al., Phys. Rev. X, vol. 4, pp. 1–12, 2014.
[4] J. J. Geuchies, C. Van Overbeek, et al. submitted
[5] K. Bian, J. J. et al. ACS Nano, vol. 5, no. 4, pp. 2815–2823, 2011.
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