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Chapter 1: Cluster Origin of Solvent Fea... > QUANTUM DOTS AND THEIR APPLICATIONS ... - Pg. 18

Cluster Origin of Solvent Features TUNING PLASMONIC PROPERTIES OF Au NANORODS: DIRECTED ASSEMBLY Au nanorods (NRs) exhibit optical properties, which are tunable with their shape leading to sensing, imaging and biomedical therapeutic applications (Faraday, 1857). Colloidal prepara- tions of Au NRs impart surfactants or others on NR surfaces; a preparation leads to a surfactant bilayer on surface (Murphy et al., 2010). Specific chemistry plays roles in nanomaterial usage at Au/surfactant interface, hydrophobic surfactant bilayer and surfactant interface with aqueous bulk. All interfaces provide strategies for altering NR properties, e.g., stability against aggregation, toxicity and ease of assembly. Solvent-accessible interface dictates NR interactions with other par- ticles, macromolecules and living cells. Optical properties of metal NPs (MNPs) are dominated duce topologies with optical/electrical properties. Results were presented on Au NR self-assembly, via formation of 2D/three-dimensional (3D) su- perlattices of standing Au NRs, with a tuning of longitudinal/transverse-localized SPRs (LSPRs). Directional self-assembly strategy of Au NRs can be controlled using non-conventional surfactants, which lead to formation of oriented liquid crystal- line (LC) phases. From ordered systems a novel mechanism for Au NR growth via seeded growth was proposed. Directed assembly and alignment control of Au NRs can be achieved via incor- poration on supramolecular chiral fibres, which permits a fine tuning of circular dichroism (CD) of Au NRs, which were compared to predictions by theories and parameters affecting them were discussed (Fan & Govorov, 2010). QUANTUM DOTS AND THEIR