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Solid‐State Fabrication of Cu 2 O/CuO Hydroxide Nanoelectrode Array onto Graphene Paper by Thermal Dewetting for High‐Sensitive Detection of Glucose
Author(s) -
Scandurra Antonino,
Censabella Maria,
Boscarino Stefano,
Grimaldi Maria Grazia,
Ruffino Francesco,
Condorelli Guglielmo Guido,
Malandrino Graziella
Publication year - 2021
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.202100389
Subject(s) - dewetting , materials science , graphene , x ray photoelectron spectroscopy , detection limit , amperometry , nanostructure , chemical engineering , hydroxide , nanotechnology , analytical chemistry (journal) , electrode , electrochemistry , thin film , chemistry , chromatography , engineering
Nanostructures of Cu 2 O/CuO hydroxide suitable for the electrochemical determination of glucose are obtained by solid‐state dewetting of CuO layers 6, 8, and 31 nm thin deposited by sputtering onto 240 μm‐thick graphene paper. Solid‐state dewetting in nitrogen produces a partial decomposition of CuO into Cu 2 O and Cu. X‐ray diffraction patterns reveal the presence of high‐index crystallographic facets, which are reactive and useful toward glucose oxidation to gluconolactone. Typically, morphology studied by scanning electron microscopy reveals faceted nanoparticles with an average size below 200 nm. X‐ray photoelectron spectroscopy shows that the nanostructure surfaces of Cu 2 O and metallic copper exposed to natural ambient are promptly reoxidized and hydroxidized to a mixture of CuO and Cu(OH) 2 . Electrochemical characterization in amperometric mode reveals linear response to glucose concentration in the range from 50 to 10 × 10 −3 m , sensitivity up to 83 μA cm −2 m m −1 , and limit of detection up to 3.6 × 10 −6 m . Good combination of low cost and simplicity of preparation with low limit of detection, high sensitivity, and wide linear range makes the proposed electrodes suitable for a variety of applications ranging from health to food and beverage industries.