期刊
JOURNAL OF NANOPARTICLE RESEARCH
卷 14, 期 7, 页码 -出版社
SPRINGER
DOI: 10.1007/s11051-012-1001-7
关键词
Silver nanoparticles; Nanocombs; Branched nanorods; Seed-mediated growth
资金
- Ministry of Higher Education of Malaysia [FRGS/1/2012/SG02/UKM/02/3]
- Universiti Kebangsaan Malaysia Research University [UKM-GUP-NBT-08-25-086]
- Prime Impact Grant Project
Branched nanocrystals, particularly nanocombs, are a unique 1D-morphology that is normally formed in polytypic materials, such as ZnO, and rarely occurs in the highly symmetric fcc metallic system. Here, we report the chemical synthesis of nanocombs of a highly symmetrical fcc silver system that is realized by reducing the silver ions in the presence of a mixture of silver nanoseeds and binary surfactants, namely cetyltrimethylammonium bromide (CTAB) and hexamethylenetetramine (hexamine or HMT), under an alkaline condition. The silver nanocombs feature a high-degree branching orientation toward a single direction with good branch-to-branch spacing. The nanocombs formation was very sensitive to the concentrations of CTAB, HMT and NaOH in the reaction in which, in a typical case, nanocombs or curly nanowires were produced by controlling the concentration of these chemicals in the reaction. We hypothesized that the branching could be due to: (i) a kind of polytypism in such highly symmetrical fcc nanocrystals that was enabled by a selective surfactant adhesion process on the growing crystalline plane and (ii) lattice defects or twinning induced growth redirection in the nanocrystals. The silver nanocombs might generate a peculiar characteristic that is probably superior to those produced by other morphologies, such as nanorods, nanowires, and so on. Thus, it should find extensive use in the currently existing applications.
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