One-Pot Radiolytic Synthesis of Gold Nanorods and Their Optical Properties

Abstract

A novel one-pot synthesis method to prepare gold nanorods of different aspect ratios using radiolysis is presented. The gold nanorods are synthesized by radiolytic reduction of Au III complexes in a micellar solution formed by a mixture of cationic surfactants (cetyltrimethylammonium bromide and tetraoctylammonium bromide) and in the presence of acetone and silver ions. The mechanisms of reduction of gold complexes and formation of the nanorods are discussed. The nanorods can be trapped in a poly(vinyl alcohol) gel formed under irradiation. The UV-visible absorption spectra of nanorod solutions are compared with calculations performed by using the discrete dipole approximation method, underlying the effect of the rod aspect ratio distribution.

Coordination chemistry approach for the end-to-end assembly of gold nanorods

“…We have developed a novel one-pot method to prepare gold nanorods of different aspect ratios using radiolysis [30]. This synthesis leads to monodisperse nanorods.…”

“…4 0 -(4-Mercaptophenyl)-2,2 0 :6 0 ,2 00 -terpyridine (tpySH) tpySH was synthesized following previously published procedure, without modification and with similar yield [33]. c-radiolysis ( 60 Co source) for 14 h. The color of the solution changed from orange yellow to brown, indicating the formation of Au-NRs [30]. This solution was centrifuged at 5000 rpm and the resulting precipitate was re-dispersed in 10 mL of water.…”

“…This radical will slowly reduce gold ions. The reduction and growth mechanisms have been studied in details [30].…”

“…Herein, the later approach has been efficiently used to align Au-NRs synthesized by c-radiolysis [30].…”

Electron Beam Mediated Simple Synthetic Route to Preparing Layered Zinc Hydroxide

“…Many scientists have reported the preparation of metal crystallite, metal oxide, metal sulfide and alloy using radiation techniques combined with other synthetic methods. [22][23][24] However, there are only a few reports of the preparation of LHS materials using the radiation method. 25,26 In this report, we developed a novel synthetic route to synthesize the ZHN from zinc nitrate hexahydrate in 2-propanol using the electron beam without base molecules, stabilizers, or heat treatment.…”