期刊
NANO LETTERS
卷 14, 期 4, 页码 2157-2161出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl500471g
关键词
Nanoprism; concave nanocube; capillary force; assembly; template
类别
资金
- AFOSR [FA9550-09-1-0294, FA9550-12-1-0280]
- AOARD [FA2386-13-1-4124]
- Nonequilibrium Energy Research Center (NERC), an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0000989]
- National Science Foundation's MRSEC program at the Materials Research Center of Northwestern University [DMR-1121262]
- Northwestern University
- Northwestern University's International Institute for Nanotechnology
- NSF
We report the large-area assembly of anisotropic gold nanoparticles into lithographically defined templates with control over their angular position using a capillary force-based approach. We elucidate the role of the geometry of the templates in the assembly of anisotropic nanoparticles consisting of different shapes and sizes. These insights allow us to design templates that immobilize individual triangular nanoprisms and concave nanocubes in a shape-selective manner and filter undesired impurity particles from a mixture of triangular prisms and other polyhedra. Furthermore, by studying the assembly of two particles in the same template, we elucidate the importance of interparticle forces in this method. These advances allow for the construction of face-to-face and edge-to-edge nanocube dimers as well as triangular nanoprism bowtie antennas. As an example of the fundamental studies enabled by this assembly method, we investigate the surface-enhanced Raman scattering (SERS) of face-to-face concave cube dimers both experimentally and computationally and reveal a strong polarization dependence of the local field enhancement.
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