Cu(I) Coordination Complex Precursor for Randomized CuOx Microarray Loaded on Carbon Nanofiber with Excellent Electrocatalytic Performance for Electrochemical Glucose Detection
by
Sorina Motoc 1
, Carmen Cretu 1, Otilia Costisor 1, Anamaria Baciu 2, Florica Manea 2,* and Elisabeta I. Szerb 1,*
Sorina Motoc 1, Carmen Cretu 1, Otilia Costisor 1, Anamaria Baciu 2, Florica Manea 2,* and Elisabeta I. Szerb 1,*
1
“Coriolan Dragulescu” Institute of Chemistry, Romanian Academy, 24 Mihai Viteazu Bvd., 300223 Timisoara, Romania
2
Department of Applied Chemsitry and Engineering of Inorganic Compounds and Environment, Politehnica University of Timisoara, 2 Victoriei Square, 300006 Timisoara, Romania
*
Authors to whom correspondence should be addressed.
Sensors 2019, 19(24), 5353; https://doi.org/10.3390/s19245353
Received: 29 October 2019 / Revised: 29 November 2019 / Accepted: 1 December 2019 / Published: 4 December 2019
(This article belongs to the Section Chemical Sensors)
A homoleptic ionic Cu(I) coordination complex that was based on 2,2′-biquinoline ligand functionalized with long alkyl chains (Cu(I)–C18) was used as a precursor to modify a carbon nanofiber paste electrode (Cu–C18/CNF). Randomized copper oxide microelectrode arrays dispersed within carbon nanofiber paste (CuOx/CNF) were obtained by electrochemical treatment of Cu–C18/CNF while using cyclic voltammetry (CV). The CuOx/CNF exhibited high electrocatalytic activity towards glucose oxidation at +0.6 V and +1.2 V vs. Ag/AgCl. Infrared Spectroscopy (FTIR) and scanning electron microscopy (SEM) characterized the electrodes composition. Cyclic voltammetry (CV), square wave-voltammetry (SWV), and multiple-pulsed amperometry (MPA) techniques provided optimized conditions for glucose oxidation and detection. A preconcentration step that involved 10 minutes accumulation at open circuit potential before SWV running led to the lowest limit of detection and the highest sensitivity for glucose detection (5419.77 µA·mM−1·cm−2 at + 1.1 V vs. Ag/AgCl) vs. Cu-based electrodes reported to date in literature.
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Keywords:
Cu(I) coordination complex; non-enzymatic glucose sensor; hybrid electrode; randomized copper oxide microarray; voltammetric and amperometric detection
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MDPI and ACS Style
Motoc, S.; Cretu, C.; Costisor, O.; Baciu, A.; Manea, F.; Szerb, E.I. Cu(I) Coordination Complex Precursor for Randomized CuOx Microarray Loaded on Carbon Nanofiber with Excellent Electrocatalytic Performance for Electrochemical Glucose Detection. Sensors 2019, 19, 5353.
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