期刊
MATERIALS CHEMISTRY AND PHYSICS
卷 122, 期 2-3, 页码 380-385出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2010.03.009
关键词
Ligand exchange method; Gold nanoparticles; UV-vis spectroscopy; Zeta potential
资金
- CSIR, New Delhi [09/715(0008)/2008-EMR-I]
- Department of Science and Technology, New Delhi [SR/NM/NS-28/2008]
Mercaptothiadiazole ligands functionalized with thiol (2,5-dimercapto-1,3,4-thiadiazole (DMT)) and methyl (5-methyl-2-mercapto-1,3,4-thiadiazole (MMT)) groups capped onto citrate capped gold nanoparticles (C-AuNPs) by ligand exchange reaction was investigated by UV-vis spectroscopy, FT-IR spectroscopy and transmission electron microscopy (TEM) techniques. The surface plasmon resonance band at 522 nm for C-AuNPs was shifted to 530 nm after capping with DMT whereas an additional band was observed at 630 nm due to aggregation in addition to a shift in the band at 522 nm after capping of MMT onto C-AuNPs. Thus, capping of DMT onto C-AuNPs leads to the formation of stable AuNPs while capping of MMT leads to the formation of unstable AuNPs. FT-IR studies show that the citrate ions were completely replaced by both DMT and MMT ligands from the AuNPs. TEM images indicate that the size and shape of the AuNPs remain same after capping of these ligands. (C) 2010 Elsevier B.V. All rights reserved.
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