Facile and rapid synthesis of Pd nanodendrites for electrocatalysis and surface-enhanced Raman scattering applications

Abstract

Numerous properties from metal nanostructures can be tuned by controlling both their size and shape. In particular, the latter is extremely important because the type of crystalline surface affects the surface electronic density. This paper describes a simple approach to the synthesis of highly-structured, anisotropic palladium nanostructured dendrites. They were obtained using an eco-friendly biomolecule 5-hydroxytryptophan, which acts as both a reducing and stabilizing agent. The growth mechanism is proposed for the evolution of dendrites morphology. It was found that the concentration of 5-hydroxytryptophan played a vital role on the morphology of the nanostructured Pd dendrites. This nanomaterial shows enhanced electrocatalytic performance towards the oxidation of formic acid, and it exhibits surface-enhanced Raman scattering properties towards the prostate specific antigen. These properties may be explored in fuel cells and biosensors, respectively.

Size‐Dependent Activity of Palladium Nanoparticles: Efficient Conversion of CO2 into Formate at Low Overpotentials

“…ECSAs were calculated on the basis of the equation ECSA= Q H /0.21 [Pd], in which Q H [mC] is the integrated charge associated with the hydrogen adsorption/desorption in the hydrogen region of the CVs. The constant of 0.21 mC cm −2 corresponds to the electrical charge associated with the monolayer adsorption of hydrogen on Pd . [Pd] refers to the Pd loading on the working electrode.…”

Highly porous palladium nanodendrites: wet-chemical synthesis, electron tomography and catalytic activity

“…10 For instance, dendritic-like nanoparticles which consist of highly branched armcomposed structure, and therefore can be considered as porous particles, potentially exhibit high catalytic activity thanks to their high surface area and to the presence of low coordinated sites in high densities on their branches. [16][17][18][19][20] In summary, both parameters, that is, surface area and density of low-coordination sites are strongly intertwined, and unless the particle shape and crystallinity is perfectly defined both should be taken into consideration at the same time.…”

Utilization of Inexpensive Carbon-Based Substrates as Platforms for Sensing

“…Although these materials and their varying morphologies showed promising detection capabilities, they are expensive to fabricate and require specialized equipment with trained personnel. In addition, the cost of a conventional SERS substrate like silicon is $0.5/1 g, whereas flexible substrates like paper cost only $0.001/1 g. Moreover, the aforementioned materials and varying morphologies are often fabricated on substrates that are rigid including glass [ 28 , 29 , 30 ], silicon [ 31 , 32 ], and glass capillary [ 33 ]. These underlying rigid substrates are expensive and brittle, which make them ineffective for in-field detection of analytes that can be directly transferred from the target products; for example, in food packaging industry and agricultural fields.…”