Biosynthesis of Copper Oxide (CuO) Nanowires and Their Use for the Electrochemical Sensing of Dopamine

Abstract

A facile one-step, eco-friendly, and cost-effective approach for the formation of copper oxide (CuO) nanowires by a green method using saponin-rich Sapindus mukorossi fruit extract (SMFE). The physio-chemical characteristics of the synthesized CuO nanowires have been characterized by X-ray Diffractometry (XRD), X-ray Photoelectron Spectroscopy (XPS), FT-IR (Fourier Transform Infrared Spectroscopy, FE-SEM (Scanning Electron Microscopy), and High-Resolution Transmission Electron Microscopy (HR-TEM). Further, the electrocatalytic activity of the CuO nanowires synthesized with SMFE has been investigated, and they have been used as dopamine (DA) sensors. Because of their unique properties, the CuO nanowires/GCE exhibited remarkable electrochemical response for the detection of DA with enhanced current response. The anodic current demonstrated that the CuO nanowires/GCE linearly detects the concentration of DA over the range of 0.1 µM to 0.105 mM of DA with a regression co-efficient of 0.9960. The obtained results illustrated that the synthesized CuO nanowires can easily stimulate the electron transfer reaction between DA and the nanowires modified electrode with the improvement of the conductivity and stability of the electrode. This remarkable electrocatalytic property of CuO nanowires makes it a unique electrochemical sensor for the detection of DA. Furthermore, the sensor is free from the interference of ascorbic acid, uric acid, and other interfering species. Moreover, the anti-interference performance also showed that the CuO nanowires/GCE could be employed for the determination of DA in real samples with good selectivity and sensitivity.

N-Doped Reduced Graphene Oxide/Gold Nanoparticles Composite as an Improved Sensing Platform for Simultaneous Detection of Dopamine, Ascorbic Acid, and Uric Acid

“…In addition, the capacitive current is always lower on this electrode. Figure 4c,d show the relationship between the maximum anodic currents measured on both electrodes and the square root of the scan rates, which are in agreement with the DA oxidation mechanism mainly controlled by diffusion [35].…”

One-Pot Decoration of Cupric Oxide on Activated Carbon Fibers Mediated by Polydopamine for Bacterial Growth Inhibition

“…The peaks in the frequency ranges of 3200-3700 cm −1 (region 1, O-H stretching of the hydroxyl group) and 1360-1580 cm −1 (region 2, N-H stretching of secondary amine) significantly increased for ACF@PD-CuO compared with those in the pristine ACFs owing to the presence of PD on the ACFs [37][38][39]. Additionally, ACF@PD-CuO shows a distinct peak at 1640 cm −1 corresponding to the stretching vibration of CuO, which further confirms the presence of CuO in ACF@PD-CuO [40,41]. The change in the surface area of the ACF-based filter is important to determine whether the adsorptive characteristics of the filter can be effectively maintained after PD-CuO deposition.…”

Bulk Nanostructuring of Janus‐Type Metal Electrodes

“…Powder X-ray diffraction (pXRD) of both electrode faces verify the structural assignments and show predominantly Cu(OH) 2 diffraction signals for the 1B face, while the 1T face predominantly shows the corresponding CuO diffraction peaks;s ee Figure 2a.N ote that both faces show residual signals for the other nanostructure due to the porouss tructure of the electrode. ATR-IR spectra ( Figure S6) also indicate the structure assignments (Cu-O-H bending at 933 and 406 cm À1 ,C u ÀOs tretching modesa t6 00 and 471 cm À1 [ 25,26] ).…”