Details

Autor(en) / Beteiligte

• Berrettini, Mia G
• Braun, Gary
• Hu, Jerry G
• Strouse, Geoffrey F

Titel

NMR Analysis of Surfaces and Interfaces in 2-nm CdSe

Ist Teil von

• Journal of the American Chemical Society, 2004-06, Vol.126 (22), p.7063-7070

Ort / Verlag

Washington, DC: American Chemical Society

Erscheinungsjahr

2004

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Solid-state NMR analysis on wurtzite 2-nm hexadecylamine-capped CdSe nanocrystals (CdSe-HDA) provides evidence of discrete nanoparticle reconstruction within the Se sublattice of the nanomaterial. The cadmium and selenium atoms are probed with 1H−113Cd and 1H−77Se cross-polarization magic angle spinning (MAS) experiments, which demonstrate five ordered selenium sites in the nanoparticle that can be assigned to contributions arising from different surface sites and a selenium site one layer down from the surface. Intriguingly, in these materials both HDA and thiophenol are observed to selectively bind to specific sites on the nanoparticle surface. 2D heteronuclear chemical shift correlation (HETCOR) experiments provide evidence for thiophenol selectively binding at surface vacancies. Analysis of the NMR provides a model of a 2-nm CdSe-HDA molecular surface.