CuO nanowire/microflower/nanowire modified Cu electrode with enhanced electrochemical performance for non-enzymatic glucose sensing

Abstract

CuO nanowire/microflower structure on Cu foil is synthesized by annealing a Cu(OH)2 nanowire/CuO microflower structure at 250 °C in air. The nanowire/microflower structure with its large surface area leads to an efficient catalysis and charge transfer in glucose detection, achieving a high sensitivity of 1943 μA mM(-1) cm(-2), a wide linear range up to 4 mM and a low detection limit of 4 μM for amperometric glucose sensing in alkaline solution. With a second consecutive growth of CuO nanowires on the microflowers, the sensitivity of the obtained CuO nanowire/microflower/nanowire structure further increases to 2424 μA mM(-1) cm(-2), benefiting from an increased number of electrochemically active sites. The enhanced electrocatalytic performance of the CuO nanowire/microflower/nanowire electrode compared to the CuO nanowire/microflower electrode, CuO nanowire electrode and CuxO film electrode provides evidence for the significant role of available surface area for electrocatalysis. The rational combination of CuO nanowire and microflower nanostructures into a nanowire supporting microflower branching nanowires structure makes it a promising composite nanostructure for use in CuO based electrochemical sensors with promising analytical properties.

Highly Ordered and Crystalline Cu Nanowires in Anodic Aluminum Oxide Membranes for Biomedical Applications

“…In comparison with the absence of bands in case of the pure alumina membrane, the Raman band centred at 1090 cm −1 in case of the membrane after electrodeposition confirmed the deposition of Cu inside alumina pores . Other bands at 338 and 645 cm −1 can be attributed to the oxidation of Cu nanowires over the surface of the membrane . During the washing steps of the membrane after electrodeposition, the use of polar solvents (i.e., ethanol and water) can lead to the oxidation of overdeposited Cu nanowires …”

Oxygen vacancy modulated MnO2 bi-electrode system for attomole-level pathogen nucleic acid sequence detection

“…Superior electrocatalytic activity of FM550 device was observed plausibly due to large surface area of micro-flower structure and enhanced electron-transfer ability due to the higher accessible area, and therefore shorter charge diffusion path. [55] , [54] Increased electrical conductivity of FM550 results in shifting of reduction peak voltage (-0.35 V) towards more anodic potential compared to FM450 (-0.4 V) and FM350 (-0.54 V) electrodes which suggest easier electron transfer across the interface. After the superiority of the FM550 electrode has been established, it is therefore utilized for further studies in this work.…”

Oxidation of copper electrodes on flexible polyimide substrates for non-enzymatic glucose sensing

“…A particularly popular candidate family for non-enzymatic glucose sensors, that can address many of the demands for non-invasive designs, are copper and its oxides. They offer low cost, low toxicity, accessible synthesis routes, good optical and electrical characteristics, and the ability to tune their morphology and structure [1,[13][14][15][16][17][18][19][20]. A number of review articles has covered recent advances across different aspects of copper oxide nanoparticles for glucose sensing in detail [21][22][23][24][25].…”