Ni-Co bimetal nanowires filled multiwalled carbon nanotubes for the highly sensitive and selective non-enzymatic glucose sensor applications

Abstract

The facile, time and cost efficient and environmental benign approach has been developed for the preparation of Nickel (Ni)-Cobalt (Co) alloy nanowires filled multiwalled carbon nanotubes (MWCNTs) with the aid of mesoporous silica nanoparticles (MSN)/Ni-Co catalyst. The controlled incorporation of Ni-Co nanostructures in the three dimensional (3D) pore structures of MSN yielded the catalytically active system for the MWCNT growth. The inner surface of MWCNTs was quasi-continuously filled with face-centered cubic (fcc) structured Ni-Co nanowires. The as-prepared nanostructures were exploited as non-enzymatic electrochemical sensor probes for the reliable detection of glucose. The electrochemical measurements illustrated that the fabricated sensor exhibited an excellent electrochemical performance toward glucose oxidation with a high sensitivity of 0.695 mA mM−1 cm−2, low detection limit of 1.2 μM, a wide linear range from 5 μM–10 mM and good selectivity. The unprecedented electrochemical performances obtained for the prepared nanocomposite are purely attributed to the synergistic effects of Ni-Co nanowires and MWCNTs. The constructed facile, selective and sensitive glucose sensor has also endowed its reliability in analyzing the human serum samples, which wide opened the new findings for exploring the novel nanostructures based glucose sensor devices with affordable cost and good stability.

Nickel‐Nanoparticles on Doped Graphene: A Highly Active Electrocatalyst for Alcohol and Carbohydrate Electrooxidation for Energy Production

“…The peak at around 2950 cm −1 in Figure B–a is the combination of D and G bands, often referred to as D+G band. The hump at 3180 cm −1 is due to the overtone of D / (2D / ) band ,. For the Ni‐NGr composite, the intensity ratio of D‐peak to G‐peak (I D /I G ), representing the defect density of carbon is 1.03, which is similar in magnitude to those for NGr and Gr .…”

“…On the other hand, the diffraction peak in Figure A–b was noted at 2θ=25.1 0 , which is also assigned to (002) refraction peak of graphene sheet for the Ni−Gr nanocomposite ,. The Ni‐NGr (Figure A–c) nanocomposite showed significant diffraction peaks at 2θ=44.4 0 , 51.7 0 and 76.2 0 , which is attributed to (111), (200) and (220) of the face centre crystalline plane of Ni, respectively; thus, confirming the presence of Ni nanoparticles in the composite . The diffraction peaks for Ni nanoparticles in Ni−Gr nanocomposite are at similar positions to that of Ni‐NGr composite.…”

“…The outcome of the electro‐oxidation of glucose on Ni−NGr electrodes is consistent with the nickel based electrocatalysts reported. The reaction mechanism of nickel‐based electrodes towards glucose oxidation is given in Equation :,, …”

Nanostructured Inorganic Materials at Work in Electrochemical Sensing and Biofuel Cells

“…Indeed, nanostructured metal oxides have two major weaknesses that impede their widespread applications, which are poor electronic conductivity and structure collapse. Therefore, loading metal-based nanostructures on excellent conductive supports such as CNTs, MWCNTs, CNFs, and GNSs is the ideal solution to alleviate the two problems and the strategy has proven its efficiency in numerous examples [90,[109][110][111][112][113][114][115][116]. The other effective solution is the combination of nanostructured carbons or metals with enzymes to design hybrid electrode materials with enhanced catalytic properties in electroanalysis and fuel cells [39,[117][118][119][120][121][122][123][124][125][126][127].…”

Few‐layer graphene coated on indium tin oxide electrodes prepared by chemical vapor deposition and their enhanced glucose electrooxidation activity

“…Hence, glucose is researched for alternative energy sources as a fuel. Glucose could be directly oxidized to produce electricity but the detection of glucose is classified into two types as (a) enzymatic and (b) nonenzymatic glucose detection . Although, enzyme‐based GOR has advantages such as high sensitivity and low response time, low chemical stability, and complex synthesis are disadvantages of GOR.…”