期刊
ACS NANO
卷 7, 期 12, 页码 11064-11070出版社
AMER CHEMICAL SOC
DOI: 10.1021/nn404765w
关键词
gold nanospheres; plasmonics; monodisperse; chemical etching; Fano-like resonance
类别
资金
- NRF [2009-0082451, 2010-0029409, 2010-1AAA001-0029018]
- DOE SCGF program
- KAUST University
- CONICET
- ANPCyT [PICT2010/1233]
- Universidad Nacional de Cordoba
- National Science Foundation under NSF [ECS-0335765]
- Harvard MRSEC program of the National Science Foundation [DMR-0820484]
- National Research Foundation of Korea [2009-0082451] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Ultrasmooth, highly spherical monocrystalline gold particles were prepared by a cyclic process of slow growth followed by slow chemical etching, which selectively removes edges and vertices. The etching process effectively makes the surface tension isotropic, so that spheres are favored under quasi-static conditions. It is scalable up to particle sizes of 200 nm or more. The resulting spherical crystals display uniform scattering spectra and consistent optical coupling at small separations, even showing Fano-like resonances in small clusters. The high monodispersity of the particles we demonstrate should facilitate the self-assembly of nanoparticle clusters with uniform optical resonances, which could in turn be used to fabricate optical metafluids. Narrow size distributions are required to control not only the spectral features but also the morphology and yield of clusters in certain assembly schemes.
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