Details

Autor(en) / Beteiligte

• Chan, Henry
• Demortière, Arnaud
• Vukovic, Lela
• Král, Petr
• Petit, Christophe

Titel

Colloidal Nanocube Supercrystals Stabilized by Multipolar Coulombic Coupling

Ist Teil von

• ACS nano, 2012-05, Vol.6 (5), p.4203-4213

Ort / Verlag

United States: American Chemical Society

Erscheinungsjahr

2012

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• We explore microscopic principles governing the self-assembly of colloidal octylamine-coated platinum nanocubes solvated in toluene. Our experiments show that regular nanocubes with an edge length of l RC = 5.5 nm form supercrystals with simple cubic packing, while slightly truncated nanocubes with an edge length of l TC = 4.7 nm tend to arrange in fcc packing. We model by averaged force fields and atomistic molecular dynamics simulations the coupling forces between these nanocrystals. Our detailed analysis shows that the fcc packing, which for cubes has a lower density than simple cubic packing, is favored by the truncated nanocubes due to their Coulombic coupling by multipolar electrostatic fields, formed during charge transfer between the octylamine ligands and the Pt cores.