Tailored synthesis of various Au nanoarchitectures with branched shapes

Abstract

The development of a simple and feasible method to synthesize Au nanoarchitectures with branched shapes is highly desired and technically important for the exciting anisotropic Au structures which are useful in diverse research fields. In this study, a one-step and rapid strategy is developed to selectively synthesize various Au architectures, including flower-, cauliflower-, raspberry-, urchin-, confeito-like architectures, in aqueous solution at room temperature without the need for any template, seed, or additive. Our strategy is quite unique in its simplicity which remarkably facilitates the synthetic procedure in comparison with commonly used seed-mediated growth approach. By changing reducing agents, Au salts, and their concentrations in the reactive system, it becomes possible to tailor both of the shapes and sizes of the branched Au architectures. Experimental section MaterialsHAuCl 4 , catechol (CC), ascorbic acid (AA), NaBH 4 and gum Arabic were purchased from Nacalai Tesque Inc, Japan. KAuBr 4 was obtained from Sigma.

l-Arginine-assisted electrochemical fabrication of hierarchical gold dendrites with improved electrocatalytic activity

“…It is known that the shape and size of Au nanocrystals have remarkable effects on their properties and applications [7][8][9]. Therefore, many efforts are focused on synthesizing Au nanostructures with different shapes such as rods [8], wires [10], spheres [11], flowers [12], dendrites [13], hollow structures [14], and so on [15,16].…”

Self‐Assembled Platinum Nanoflowers on Polydopamine‐Coated Reduced Graphene Oxide for Methanol Oxidation and Oxygen Reduction Reactions

“…[11][12][13][14][15][16] In particular, Pt nanostructures with branched structural features are highly favorable for the improvement of Pt utilization efficiency and the enhancement of Pt electrocatalytic performance. [13,15] Branched noble metal nanoparticles, which have attracted strong interest, [17][18][19] are synthesized mainly by using template-, seed-, and surfactant-directed strategies.…”

Solution-Phase Synthesis of Branched Metallic Nanoparticles for Plasmonic Applications

“…4D 33 . HTAB not only protects the crystal facets with its long alkyl chain but also regulates the reducing reaction because of the bromide ion 27,32 . The bromide ion can lower the redox potential of Au 3 , which decreases the reaction rate to allow anisotropic crystal growth.…”

“…1A . The branched nanoparticles have been named by association with similar structures, such as flower-like nano-flower 25 27 , nano-star 27 30 , nano-urchin 27,31 , and confeito-like nanoparticles 27,32 individual particles decreased. Therefore, the process controlling the size of CAuNPs was considered to be the aggregation of seed particles.…”