期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 262, 期 -, 页码 801-809出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.02.064
关键词
Surface conversion of smooth Cu; Nanoprocess; Flower-like Cu2Se nanosheet; Urchin-like Cu nanowire array; Electrochemical nonenzymatic glucose sensor
资金
- National Natural Science Foundation of China [21173075, 21403063]
A novel surface conversion of smooth copper electrodes into flower-like Cu2Se nanosheets is realized in 5150 s by a cathodic polarization at-2.1 V vs. saturated mercurous sulfate electrode in a solution of 0.5 M Na2SO4 containing 20 mM Na2SeSO3. It involves continuous autooxidation of Cu to Cu2Se and its electroreduction. The flower-like Cu2Se nanosheets can be further transformed in situ into urchin-like Cu nanowire arrays by cyclic voltammetry for 5 similar to 20 cycles in a solution of 0.1 M NaOH. It undergoes repeated anodization/dissolution and deposition of Cu. The mechanisms for these fast anomalous conversions have been elucidated in detail. The in situ formed urchin-like Cu nanowire arrays from the flower-like Cu2Se can serve as an advanced glucose sensor, which possesses these merits of high sensitivity (3745 A mM(-1) cm(-2)), low detection limit (0.51 mu M), wide linear range (up to 6.11 mM), long-term stability (remaining 90.5% of its initial current response for a 12-week storage), excellent reproducibility (RSD < 5%), and reliable accuracy (with a recovery of 101%). (C) 2018 Elsevier B.V. All rights reserved.
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