1 September 2009 Orientational order in systems of nanorods: side-by-side and end-to end controlled assembly using lyotropic chromonic materials
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Abstract
We describe a simple and universal technique of controlled non-covalent assembly of metallic nanorods (NRs) using self-assembled stacks of lyotropic chromonic molecules. Depending on the charge of the NRs, the chromonic stacks assemble them either end-to-end or side-by-side through anisotropic attractive forces. The anisotropically aggregated systems of NRs show pronounced changes in spectral properties as compared to those of individual NRs, with longitudinal and transverse plasmon peaks shifting accordingly to the geometry of assembly. The length of chromonic stacks is not fixed by covalent bonds and depends strongly on temperature, chromonic concentration, ionic content and pH of the solution. As a result, all these parameters can be used to control the assembly of NRs through the control of the linking agents. We also demonstrate that the process of NRs assembly can be quenched by adding a polyelectrolyte to the solution of NRs and chromonic material. The NR assemblies arrested by the polyelectrolyte can be transferred into a polymer film such as polyvinyl alcohol, preserving their structural and optical features.
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Heung-Shik Park, Heung-Shik Park, Oleg D. Lavrentovich, Oleg D. Lavrentovich, } "Orientational order in systems of nanorods: side-by-side and end-to end controlled assembly using lyotropic chromonic materials", Proc. SPIE 7392, Metamaterials: Fundamentals and Applications II, 739210 (1 September 2009); doi: 10.1117/12.826588; https://doi.org/10.1117/12.826588
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