Ultra-thin PbS sheets by two-dimensional oriented attachment

Details Ultra-thin PbS sheets by two-dimensional oriented attachment Ultra-thin PbS sheets by two-dimensional oriented attachment

2011-03-15

arxiv.org/abs/1103.2920v1

Science 329 (2010) 550

Physics

Condensed Matter

Materials Science

5 pages, 5 figures

Scientific paper

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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