Synthesis of High Aspect-Ratio Gold Nanowires with Highly Porous Morphology

Abstract

Here, we demonstrate the formation of porous gold nanowires with diameters <60 nm by a two-step process involving the successive electrodeposition of silver then gold into the pores of a track-etched polycarbonate filtration membrane, followed by treatment with nitric acid. The resulting nanowires possess a unique, highly porous morphology, which yields a very high accessible surface area to volume ratio compared to solid nanowires of the same dimensions. Combined with the high aspect ratio of these particles (which allows for easy isolation from solution), this makes them eminently suitable for use in catalysis and sensing applications. The formation of such porous gold nanostructures was ascertained to result from the low diffusivity of the silver species within the narrow membrane pores.

Morphological and Optical Characterization of High Density Au/PAA Nanoarrays

“…The average rode diameter of the deposited Au nanoarray is ∼85.7 nm, which is greater than the diameter of the starting PAA pores; this implies that the pores are enlarged during the electrodeposition process. This may be ascribed to the etching effect of the Au electroplating solution and temperature [29]. Also, the array height is almost equal to the pore height (667 nm), and the aspect ratio is AR = 7.8.…”

Synthesis and modelling of the mechanical properties of Ag, Au and Cu nanowires

“…To achieve this, the use of a quantum chemical or density function method is important related to several parameters. The EAM parameters that usually requires for the simulation is based on the parameters of bulk structure (standard parameters for nanostructures measurement) that includes the equilibrium lattice constant, cohesive bulk energy, bulk modulus, vacancy formation energy, cubic elastic constants and diatomic molecule bond strength and bond length [265]. In general, the simulation for coinage metal nanowires start with the atoms placed in positions that mimic to the bulk face-centred cubic crystal lattice, with a pentagonal cross-section.…”

Plasmonic Modes in Au and AuAg Nanowires and Nanowire Dimers Studied by Electron Energy Loss Spectroscopy

“…After dissolution of the template, the less noble material, in this case Ag, was selectively dissolved. Since then, various groups studied the influence of both initial AuAg wire composition and dealloying parameters on the resulting porosity, in most cases for wire diameters larger than 200 nm [49][50][51][52].…”