期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 118, 期 26, 页码 14548-14554出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp504239x
关键词
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资金
- National Institute of General Medical Science [SC3GM089562]
- CSULB (RSCA)
- CSULB (MGSS)
The synthesis of stable and isolable iridium nanopartides with an average core size of similar to 1.2 +/- 0.3 nm was achieved by employing sodium S-dodecylthiosulfate as a ligand precursor during the modified Brust-Schiffrin reaction. Transmission electron microscopy (TEM) of the isolated Ir nanopartides revealed a high degree of monodispersity. Further characterizations with H-1 NMR, FT-IR, UV-vis spectroscopy, thermogravimetric analysis (TGA), and X-ray photoelectron spectroscopy (XPS) confirmed that the synthesized Ir nanopartides are stabilized by dodecanethiolate ligands produced upon the adsorption/cleavage of S-dodecylthiosulfate on the growing Ir nanoparticle surface. By comparison, synthetic attempts employing dodecanethiol as a stabilizing ligand led to the formation of Ir-thiolate species (Ir(SR)(3)) as an intermediate and Ir-hydroxide species at the completion of reaction. Mechanistic investigations of these two reactions using S-dodecylthiosulfate and dodecanethiol provided deeper understandings on the novelty of thiosulfate ligands, which allow the successful formation of stable thiolate-capped Ir nanopartides. Moreover, these Ir nanopartides were shown to have strong magnetic properties.
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