Anisotropic Plasmonic Copper/Copper Oxide Nanostructures by DC Electrophoretic Dissolution of Copper in Water for Plasmonic Sensing of Glucose

Abstract

Plasmonic nanostructures (NS) are projected to solve many challenges associated with human health, energy conversion & storage and environment pollution. Here, we report a simple, facile and sustainable electrochemical approach that can be used for large-scale synthesis of anisotropic plasmonic copper/copper oxide NS with varying shapes and morphologies. Notably, the proposed method allow the synthesis of different shapes of copper/copper oxide NS viz. spherical, stars, rods, elongated hexagons and dendrite-like simply by controlling the associated parameters such as concentration of tri-sodium citrate (TSC) as an additive, solution pH and the applied voltage. Our results demonstrate that in addition to its stabilizing effect, TSC plays an important role in anodic dissolution of Cu rod and directing the shape of the NS. The proposed synthetic method is expected to prove very helpful to overcome the challenging task of large scale production of various shaped plasmonic NS in rudimentary, economical and sustainable manner. Moreover, the obtained plasmonic Cu NS shows excellent plasmonic sensing activity toward enzyme-less detection of glucose. The limit of detection (LOD) and limit of quantification (LOQ) were estimated to be 0.16 nM and 0.54 nM, respectively.

Electrochemical reduction of CO2to ethylene on Cu/CuxO-GO composites in aqueous solution

“…The Cu/Cu x O-GO composites were prepared in two different forms, powder and thin lms by using a DC electrophoretic anodization of metallic copper foil in presence of GO suspension in aqueous tri-sodium citrate solution with slight modication in our previously reported recipe. 21 Powder form. Typically, for the synthesis of Cu/Cu x O and its composites, a metallic copper foil (2 cm  2 cm) mechanically polished with a smooth polishing paper followed by electrochemical polishing in 85% phosphoric acid, was used as a sacri-cial anode.…”

Electro-deposited Pt3Co on Carbon Fiber Paper as Nafion-Free Electrode for Enhanced Electro-catalytic Activity toward Oxygen Reduction Reaction

“…In this regard, developing low temperature methods for Pt 3 Co nanoalloy preparation with precise control over the composition along with a highly active surface area would be unequivocally beneficial for formulating the better electro-catalyst for ORR half-cell. Electro-deposition technique among other techniques such as atomic layer deposition (ALD), , chemical vapor deposition (CVD), has also been used and proved to be one of the most effective, allowing easy control over kinetics of nucleation and growth by manipulating the electro-deposition parameters. − For example, galvanostatic and pulse current electro-deposition has been reported for the preparation of Pt 3 Co electro-catalyst, exhibiting enhanced performance in PEMFCs.…”