Ultrathin PbS Sheets by Two-Dimensional Oriented Attachment

Controlling anisotropy is a key concept in the generation of complex functionality in advanced materials. For this concept, oriented attachment of nanocrystal building blocks, a self-assembly of particles into larger single-crystalline objects, is one of the most promising approaches in nanotechnolo...

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Bibliographic Details
Published inScience (American Association for the Advancement of Science) Vol. 329; no. 5991; pp. 550 - 553
Main Authors Schliehe, Constanze, Juarez, Beatriz H, Pelletier, Marie, Jander, Sebastian, Greshnykh, Denis, Nagel, Mona, Meyer, Andreas, Foerster, Stephan, Kornowski, Andreas, Klinke, Christian, Weller, Horst
Format Journal Article
LanguageEnglish
Published Washington, DC American Association for the Advancement of Science 30.07.2010
The American Association for the Advancement of Science
Subjects
Anisotropy
Attachment
Chemical compounds
Chemical synthesis methods
Cross-disciplinary physics: materials science; rheology
Crystal growth
Crystallites
Crystallization
Crystals
Devices
Emission spectra
Exact sciences and technology
Lead
Ligands
Materials science
Methods of nanofabrication
Micrometers
Nanocrystals
Nanoparticles
Nanostructure
Physics
Quantum dots
Self assembly
Two dimensional
Ultrathin films
Growth rate
Anisotropy
Organic solvents
Growth mechanism
Joining
Lead sulfide
Chemical synthesis
Nanocrystal
Nanotechnology
Nanomaterial synthesis
Faceting
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Summary:Controlling anisotropy is a key concept in the generation of complex functionality in advanced materials. For this concept, 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 two-dimensional oriented attachment of lead sulfide (PbS) nanocrystals into ultrathin single-crystal sheets with dimensions on the micrometer scale. We found that this process is initiated by cosolvents, which alter nucleation and growth rates during the primary nanocrystal formation, and is finally driven by dense packing of oleic acid ligands on {100} facets of PbS. The obtained nanosheets can be readily integrated in a photodetector device without further treatment.
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ISSN:0036-8075
1095-9203
DOI:10.1126/science.1188035