One Pot, Spontaneous and Simultaneous Synthesis of Gold Nanoparticles in Aqueous and Nonpolar Organic Solvents Using a Diamine-Containing Oxyethylene Linkage

Abstract

The simultaneous synthesis of gold nanoparticles in both water and chloroform by the spontaneous reduction of aqueous chloroaurate ions by a diamine-containing oxyethylene linkage that partitions in both phases is demonstrated. The oxidation of the diamine consequent to reduction of the gold ions results in the polymerization of the diamine and formation of a polymeric coating around the gold nanoparticles. The gold nanoparticles are uniform in size ranging between 3 and 6 nm. The nanoparticles capped with the polymer may be stored as a powder and readily redispersed in nonpolar organic solvents and water, indicating that the surface of the polymer capping the nanoparticles is significantly different in both cases.

Synthesis of cationic hyperbranched multiarm copolymer and its application in self-reducing and stabilizing gold nanoparticles

“…According to previous reports [32][33][34][35][36] and our findings presented here, we assumed that the large amount of tertiary amino groups in HBPO-star-PDEAEMA is significant for the preparation of AuNPs. To validate our assumption, we selected some hyperbranched polymers without amino groups as the controls, such as hyperbranched polyglycerol (HPG) and hyperbranched polyester H20, to prepare AuNPs through the same approach.…”

Controlled spontaneous generation of gold nanoparticles assisted by dual reducing and capping agents

“…Notably, the size of the particles was strongly affected by the amine concentration, and only scarcely by the reaction time. A careful survey of the literature showed that other amines such as aliphatic amines (hexadecylamine [88], tree-type multiplehead amine bis(amidoethyl-carbamoylethyl)octadecylamine [89]), and aromatic amines (4-hexadecylaniline [90], bis(2-(4-amino phenoxy)ethyl)ether (DAEE) [91]) were also investigated to prepare Au-NPs in aqueous and organic solutions. Interestingly, in the case of DAEE, the stabilization of Au-NPs was ensured by the polymer resulting from the oxidative polymerization of the diamine compound.…”

Gold nanoparticles prepared using polyethylenimine adsorbed onto montmorillonite

“…The formation of patches on the adsorption surface instead of flexible ethylenimine segments in PEI polymer solution favors the formation of stable gold particles. The rapid reduction of gold at low pH values can be attributed to the more readily accessible ethylenimine units on the clay surface, where the reduction function of amine-functionalized polymers yields metal nanoparticles without the addition of an extra reducing agent [27][28][29].…”