Self-Assembled Colloidal Superparticles from Nanorods
Science 19 October 2012:
Vol. 338 no. 6105 pp. 358-363
DOI: 10.1126/science.1224221
Vol. 338 no. 6105 pp. 358-363
DOI: 10.1126/science.1224221
- Tie Wang1,
- Jiaqi Zhuang1,
- Jared Lynch1,
- Ou Chen1,
- Zhongliang Wang1,
- Xirui Wang1,
- Derek LaMontagne1,
- Huimeng Wu1,
- Zhongwu Wang2,
- Y. Charles Cao1,*
Colloidal superparticles are nanoparticle assemblies in the form of colloidal particles. The assembly of nanoscopic objects into mesoscopic or macroscopic complex architectures allows bottom-up fabrication of functional materials. We report that the self-assembly of cadmium selenide–cadmium sulfide (CdSe-CdS) core-shell semiconductor nanorods, mediated by shape and structural anisotropy, produces mesoscopic colloidal superparticles having multiple well-defined supercrystalline domains. Moreover, functionality-based anisotropic interactions between these CdSe-CdS nanorods can be kinetically introduced during the self-assembly and, in turn, yield single-domain, needle-like superparticles with parallel alignment of constituent nanorods. Unidirectional patterning of these mesoscopic needle-like superparticles gives rise to the lateral alignment of CdSe-CdS nanorods into macroscopic, uniform, freestanding polymer films that exhibit strong photoluminescence with a striking anisotropy, enabling their use as downconversion phosphors to create polarized light-emitting diodes.
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