期刊
CANADIAN JOURNAL OF CHEMISTRY
卷 87, 期 11, 页码 1641-1649出版社
CANADIAN SCIENCE PUBLISHING
DOI: 10.1139/V09-127
关键词
metal nanoparticles; capping ligands; electronic effect; steric effect; EXAFS
资金
- 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
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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