Novel Preparation of Snowflake-like Dendritic Nanostructures of Ag or Au at Room Temperature via a Wet-Chemical Route

Abstract

In this letter we describe a novel but effective wet-chemical route for the simple preparation of snowflake-like dendritic nanostructures of Ag, which are homogeneous in size, carried out by directly mixing AgNO3 and p-phenylenediamine (PPD) aqueous solutions at room temperature. It reveals that such dendrites are aggregates of nanoparticles and highly crystalline in nature. It is found that the molar ratio of [PPD]/[Ag+] influences the final morphologies of the structures formed and that excessive PPD (the molar ratio of [PPD]/[Ag+] is higher than 1:1) is crucial to achieving dendrites. The possible dendritic growth mechanism is also predicted. This method can also be extended to the preparation of Au dendrites.

Preparation of modified sodium lignosulfonate hydrogel–silver nanocomposites

“…Figure 9 shows the XRD pattern of the AgNPs-MSLS-hydrogel powders collected. All the diffraction signals at 38.18, 44.68, 64.608, and 77.628 observed can be assigned to the (111), (200), (220), and (311) facets of the cubic structure of metallic Ag (JCPDS 04-0783) [39][40][41], indicating that the Ag nanoparticles in the AgNPs-MSLS-hydrogel powders are crystalline. The results confirmed the presence of AgNPs in the hydrogel nanocomposites.…”

Green Wet Chemical Route for the Synthesis of Silver and Palladium Dendrites

“…First, we must recall that most dendritic structures are synthesized by electrochemical deposition [13] and that wet chemical routes are more scarce. [4][5][6][7][8][9] Second, whatever the method, the observed final morphology of the nanodendrites depends on several parameters, including the extent of adsorption or complexation among reactants, the working electrode potential in electrochemistry, and the injection sequence of reactants and eventual surfactants in wet chemical routes. In the present example of palladium nanodendrites, it is likely that the observed morphology, as also described in the literature, [9] must be ascribed to the interplay of such parameters, resulting in the modulation of the reduction kinetics at the early stages of the reaction.…”

“…Concentrating specifically on the case of Ag, template-and surfactant- [ free synthesis of Ag nanodendrites by Yang et al was performed with use of a suspension of zinc microparticles as a heterogeneous reducing agent. [4] As a truly wet chemical route, a novel preparation of snowflake-like dendritic nanostructures of Ag or Au at room temperature was proposed with p-phenylenediamine [5] or dendritic Ag with ascorbic acid, [6] provided the organic reducing agent was in large excess. Finally, dendritic silver synthesis by a surfactant-free, mixed-solvent water-acetone route by using l-ascorbic acid was recently published.…”

Controllable synthesis of multiple shapes of gold nanostructures

“…[1][2][3][4]. In relation to emerging electronic technologies, more complicated nanostructures are in demand (e.g., nanowires, nanotubes and their two-dimensional (2-D) and three-dimensional (3-D) nanoparticle assemblages).…”