期刊
JOURNAL OF NANOPARTICLE RESEARCH
卷 13, 期 9, 页码 3923-3928出版社
SPRINGER
DOI: 10.1007/s11051-011-0312-4
关键词
Gold nanoparticle; Self-assembly; Chain-like; SERS; SPR; Surface energy
资金
- NSFC [20803002, 50725208]
- Research Fund for the Doctoral Program of Higher Education of China [20070006016]
Au nanoparticles with diameters of ca. 15 nm were synthesized according to the well-developed citrate reduction method. It was found that the nanoparticles tended to attach and fuse into each other to form chain-like structures with the removal of the stabilizing agents. UV-Vis absorption and HRTEM characterizations provided solid evidence for the fused features. On the basis of the HRTEM observations, we believed the decreased surface energy as well as the dipole-dipole interaction is responsible for the formation of the chain-like structures. SERS activity investigation indicated that the intensities of the b2-type bands have close relation with the concentration of the probing molecules, which further confirmed the chemical effect character of the b2-type scatterings.
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