3 years ago

Morphological Control of Seedlessly-Synthesised Gold Nanorods using Binary Surfactants.

Kevin Critchley, Lucien Roach, Stephen D Evans, Patricia Louise Coletta, Sunjie Ye, Samuel Charles Tensin Moorcroft
High purity gold nanorods with tunable morphology have been synthesized through a binary--surfactant seedless method, which enables the formation of monocrystalline gold nanorods with diameters between 7 and 35 nm. The protocol has high shape yield and monodispersity, demonstrating good reproducibility and scalability allowing synthesis of batches 0.5 L in volume. Morphological control has been achieved through the adjustment of the molar concentrations of cetyltrimethylammonium bromide and sodium oleate in the growth solution, providing fine tuning of the optical scattering and absorbance properties of the gold nanorods across the visible and NIR spectrum. Sodium oleate was found to provide greatest control over the aspect ratio (and hence optical properties) with concentration changes between 10 and 23 mM leading to variation in the aspect ratio between 2.8 and 4.8. Changes in the geometry of the end--caps were also observed as a result of manipulating the two surfactant concentrations.

Publisher URL: http://doi.org/10.1088/1361-6528/aaa99d

DOI: 10.1088/1361-6528/aaa99d

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