Efficient and Facile Synthesis of Gold Nanorods with
Finely Tunable Plasmonic Peaks from Visible to Near-IR Range
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Abstract
Although
gold nanorods (GNRs) have been prepared with a wide range
of methods for their uses as novel diagnostic and therapeutic agents,
the synthesis of monodispersed GNRs with high yields and size tunability
still requires further improvements. We report on a simple one-pot
method for preparing highly monodispersed GNRs using phenols (e.g.,
hydroquinone, 1,2,3-trihydroxybenzene, and 1,2,4-trihydroxybenzene)
as the reducing agent and NaBH<sub>4</sub> as the initiating reactant.
Fine-tuning of the LSPR peak position of phenols-reduced GNRs from
550 to 1150 nm is accomplished by regulating the silver ion concentrations.
The size of GNRs produced via phenols reduction can also be controlled
by changing the NaBH<sub>4</sub> concentration. By systematically
optimizing the concentrations of the reagents involved in the one-pot
synthesis of GNRs, the yield (in many cases exceeding 90%) is significantly
higher than that prepared with the commonly used reductant (e.g.,
ascorbic acid). The improved efficiency and controllability cut down
the cost and time involved in GNRs production