Size-Controlled Synthesis of Machinable Single Crystalline Gold\nNanoplates

Abstract

Monodispersive size-controlled gold nanoplates were synthesized with high purity from the reduction\nof hydrogen tetrachloroaurate by reduced amount of sodium citrate, which kinetically controls the reaction\npathway, in the presence of poly(vinyl pyrrolidone) (PVP). With the insufficient addition of the reductant,\nthe molar ratio of sodium citrate and PVP relative to hydrogen tetrachloroaurate played an important\nrole in determining the geometric shape and size of the product. These nanoplates were single crystals\nwith planar width of 80−500 nm and thickness of 10−40 nm, exhibiting strong surface plasmon absorption\nin the near-infrared (NIR) region of 700−2000 nm. The gold nanoplates were used as the synthetically\nprovided nanoblocks to fabricate single-crystalline nanocomponents, such as a nanoscaled gear or a\nnanoscaled letter.