Electrochemical deposition of CoNi micro/nanostructures as new materials for electrochemical sensing of glucose

Abstract

a b s t r a c tCoNi micro/nanostructures (films and nanowires of different composition) have been obtained by electrodeposition, and tested as catalysts for glucose electro-oxidation, resulting promising material for non-enzymatic glucose sensors. Electrodeposition is an easy, low cost and one-step procedure able to prepare, from a single solution, films or nanorods with different composition, shape and morphology. For the first time, the electrocatalytic activity of glassy carbon/CoNi nanorods electrodes has been tested for glucose sensing, and compared with that of CoNi films. Voltamperometry and chronoamperometry techniques allow sensing the glucose over the CoNi structures prepared, after their superficial oxidation. The best sensitivity was obtained in the 0.1-1 mM range for the CoNi films with 42 wt% Co and the CoNi nanorods with 70 wt% Co. The main advantage of the nanorods with respect to the films is the minimization of the amount of sensing material for the same geometrical area.

High-Performance Non-enzymatic Glucose Sensors Based on CoNiCu Alloy Nanotubes Arrays Prepared by Electrodeposition

“…At present, more and more alloy research in glucose detection has replaced pure metal to improve the stability by forming bimetallic structure (Mahshid et al, 2013;Miao et al, 2013;Sheng et al, 2014;Vilana et al, 2015). Wang et al (2008) synthesized three-dimensional PtPb alloy networks on Ti substrates to overcome the shortcomings of pure metal and significantly improved the performance.…”

“…Li et al (2015) studied a series of MCo (M = Cu, Fe, Ni, and Mn) alloy nanoparticles doped carbon nanofibers electrodes and explored the distinction of different alloy sensors. These alloys had higher electrocatalytic activities and stabilities compared with those of pure metals due to the synergistic effect (Luo and Kuwana, 1994;Li et al, 2015;Vilana et al, 2015). Transition metal-based alloy is a prospective direction and worthy of further study for lowcost and high-performance non-enzymatic glucose sensors.…”

Electrochemical preparation and characterization of magnetic core–shell nanowires for biomedical applications

“…The synthesized nanorods were exhaustively cleaned in chloroform. The gold layer formation was carried out by means galvanic displacement, by immersing the nanorods in a HAuCl 4 solution at different times. The complete formation of the gold shell was tested by placing some nanorods in a vitreous carbon electrode (2 mm diameter) and testing their voltammetric response in a H 2 SO 4 0.5 M solution.…”

“…Electrochemical methods have been recently demonstrated as very useful for the synthesis of metallic nanostructures as nanoparticles, nanotubes or nanorods [1][2], which have been applied in catalysis [3], sensing [4] or computer science [5]. On the other hand, magnetic nanoparticles, especially of iron oxides, are being used in biomedicine for treatment as hyperthermia or drug delivery [6][7][8][9].…”

Modern Chemical Routes for the Controlled Synthesis of Anisotropic Bimetallic Nanostructures and Their Application in Catalysis

“…The general method to synthesize bimetallic nanostructure involves the successive reduction of metal ions providing an appropriate stabilizing agent in order to avoid agglomeration as well as preferential growth of the nanostructure. The traditional synthesis method for bimetallic nanostructure uses template and surfactant processes (Ahmad et al, 2019), sol-gel methods (Gołabiewska et al, 2017), and electrochemical depositions (Vilana et al, 2015). These methods require the removal of the template, surfactant, and substrate for the purification of product.…”