Gold nanorods were prepared using Ag-assisted seeded growth.25,26 Seeds were prepared by reduction of HAuCl4 (0.25 mM, 5 mL) with freshly prepared NaBH4 (10 mM, 0.3 mL) in aqueous CTAB solution (100 mM). After 30 min, an aliquot of seed solution (0.55 mL) was added to a growth solution (250 mL) containing CTAB (100 mM), HAuCl4 (0.5 mM), ascorbic acid (0.8 mM), AgNO3 (0.12 mM), and HCl (19 mM). The mixture was left undisturbed at 30 °C for 2 h. The solution was centrifuged twice (8000 rpm, 30 min) to remove excess silver salt, ascorbic acid, CTAB, and HCl and redispersed in CTAB (100 mM).
Characterization. TEM images were obtained with a JEOL JEM-1400PLUS transmission electron microscope operating at an acceleration of 120 kV. UV−vis spectra were measured with an Agilent 8453 UV−vis spectrophotometer.
文献：Blocked Enzymatic Etching of Gold Nanorods: Application to Colorimetric Detection of Acetylcholinesterase Activity and Its Inhibitors
