One-step growth of gold nanorods using a β-diketone reducing agent
The synthesis and characterisation of gold nanorods have been carried out by reduction of the gold salt HAuCl4. This has been done using a single reducing agent, acetylacetone, rather than the two reducing agents, sodium borohydride and ascorbic acid, normally required by standard wet chemistry methods of gold nanorod formation. Using this novel method, the nanorods were synthesised at several different pH values which were found to greatly affect both the rate at which the nanorods form and their physical dimensions. The concentrations of acetylacetone and silver nitrate used relative to the gold salt were found to alter the aspect ratio of the nanorods formed. Rods with an average length of 42 nm and an aspect ratio of 4.6 can be easily and reproducibly formed at pH 10 using this method. Nanorods formed under optimum conditions were investigated using TEM.
KeywordsGold Nanorod β-Diketone Synthesis Wet chemistry Colloids
- Chen HM, Liu RS (2006) Controlling length and monitoring growth of gold nanorods. J Chin Chem Soc (Taipei) 53:1343–1348Google Scholar
- Foss CA, Hornyak CL, Stocked JA, Martin CR (1992) Optical properties of composite membranes containing arrays of nanoscopic gold cylinders. J Phys Chem 96:1491–1499Google Scholar
- Li CZ, Male KB, Hrapovic S, Luong JHT (2005) Fluorescence properties of gold nanorods and their application for DNA biosensing. Chem Commun (Camb) 3924–3926. doi:10.1039/b504186d
- Takahashi H, Niidome Y, Yamada S (2005) Controlled release of plasmid DNA from gold nanorods induced by pulsed near-infrared light. Chem Commun (Camb) 2247–2249. doi:10.1039/b500337g