Journal
SCIENCE
Volume 318, Issue 5849, Pages 430-433Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1148624
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Funding
- NCI NIH HHS [Y1-CO-1020] Funding Source: Medline
- NIAID NIH HHS [AI21144] Funding Source: Medline
- NIGMS NIH HHS [Y1-GM-1104] Funding Source: Medline
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Structural information on nanometer-sized gold particles has been limited, due in part to the problem of preparing homogeneous material. Here we report the crystallization and x-ray structure determination of a p-mercaptobenzoic acid (p-MBA)-protected gold nanoparticle, which comprises 102 gold atoms and 44 p-MBAs. The central gold atoms are packed in a Marks decahedron, surrounded by additional layers of gold atoms in unanticipated geometries. The p-MBAs interact not only with the gold but also with one another, forming a rigid surface layer. The particles are chiral, with the two enantiomers alternating in the crystal lattice. The discrete nature of the particle may be explained by the closing of a 58-electron shell.
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