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arXiv · 1103.2920

Ultra-thin PbS sheets by two-dimensional oriented attachment

Constanze Schliehe·Beatriz H. Juarez·Marie Pelletier·Sebastian Jander·Denis Greshnykh·Mona Nagel·Andreas Meyer·Stephan Foerster·Andreas Kornowski·Christian Klinke·Horst Weller
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Abstract

Controlling anisotropy is a key concept to generate complex functionality in advanced materials. For this, oriented attachment of nanocrystal building blocks, a self assembly of particles into larger single crystalline objects, is one of the most promising approaches in nanotechnology. We report here the 2D oriented attachment of PbS nanocrystals into ultra-thin single crystal sheets with dimensions on the micrometer scale. We found that this process is initiated by co-solvents which alter nucleation and growth rates during the primary nanocrystal formation and finally driven by dense packing of oleic acid ligands on {100} facets of PbS. The obtained nanosheets can be readily integrated in a photo-detector device without further treatment.

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Constanze Schliehe, Beatriz H. Juarez, Marie Pelletier, Sebastian Jander, Denis Greshnykh, Mona Nagel, Andreas Meyer, Stephan Foerster, Andreas Kornowski, Christian Klinke, Horst Weller. 2011-03-15. Ultra-thin PbS sheets by two-dimensional oriented attachment. https://doi.org/10.1126/science.1188035

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