Journal
CANADIAN JOURNAL OF CHEMISTRY
Volume 87, Issue 11, Pages 1641-1649Publisher
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/V09-127
Keywords
metal nanoparticles; capping ligands; electronic effect; steric effect; EXAFS
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Funding
- Dalhousie University
- Natural Sciences and Engineering Research Council of Canada (NSERC)
- Atlantic Innovation Fund
- Canada Foundation for Innovation (CFI)
- Canadian Institutes of Health Research (CIHR)
- National Research Council Canada (NRC)
- University of Saskatchewan
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Weakly interacting ligands including three Gemini surfactants, didodecyldimethylammonium bromide (DDAB), and amines (RNH2, R2NH, and R3N) were used to prepare Au nanoparticles (NPs). Aqueous Au NPs capped with DDAB and Gemini surfactants showed similar sizes (3-4 nm), whereas toluene-based NPs stabilized with DDAB, amines, and their mixtures range from 2.5 to 9.3 nm. Ligand effect on Au-Pd NP structure was also studied with EXAFS. These findings were consistently accounted for by considering the ligand's electronic/steric effects and mixed ligands coadsorption, and suggest useful ways to control NP structure by manipulating the two effects and using mixed capping ligands.
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