Surface Engineering Three-Dimensional Flowerlike Cerium Vanadate Nanostructures Used as Electrocatalysts: Real Time Monitoring of Clioquinol in Biological Samples

Abstract

Designing a proper architecture of supporting electrode materials is the most promising strategy for improving the catalytic activity and chemical stability of electrochemical sensors. Herein, we have successfully synthesized 3D hierarchical flower-like cerium vanadate (CeVO 4 ) nanostructures by a simple hydrothermal approach. A sequence of scanning electron microscopy and spectroscopic techniques is used to clearly confirm the successful construction of CeVO 4 nanostructures. The electrocatalytic activity of these CeVO 4 modified electrodes for the electrochemical detection of clioquinol (CQ) was evaluated by cyclic voltammetry and differential pulse voltammetry methods. Benefiting from its unique 3D flower-like nanostructure, both of charge transfer rate and electronic conductivity were significantly improved, resulting in a significant enhancement in the electrochemical performance along with a wide dynamic linear range 0.02−215 μM, an ultralow detection limit (0.004 μM), a low oxidation peak potential (+0.47 V), and high selectivity in the presence of potentially interfering compounds. Interestingly, the CeVO 4 modified electrode was able to show excellent recovery range for the real sample analysis and could cheer up a commercial sensor, making it a potential sensing option to be applied in marketable electrochemical devices.

Construction of Lanthanum Vanadate/Functionalized Boron Nitride Nanocomposite: The Electrochemical Sensor for Monitoring of Furazolidone

“…Binary metal oxides (BMOs) have intensively emerged along these lines as an effective factor of functional materials for potential implementations in energy storage, biomedical, photocatalyst, energy conversion, electrochemical sensor, industrial adsorption, and so on. , BMOs exhibit abundant, exciting properties due to their excellent structural stability, diverse compositions, high theoretical capacities, suitable band gaps, crystalline phases, low charge-transfer resistance, rapid electron/ion transfer, high specific capacitance, and electronic structures. − The successes of achieving such extraordinary performances are mainly attributed to various metal compositions of ABO 4 (A = cation; B = anion). At present, rare-earth orthovanadates (RE)­VO 4 (RE = lanthanide series) arise as the most particularly exciting compound in material sciences. ,− This (RE)­VO 4 can exhibit bridging directly through oxygen atoms linkage. Most importantly, the custom of tetrahedral oxyanions (VO 4 ) 3– as structural building blocks with RE metals (4f orbitals) is a good way to enrich the physiochemical activity. − The most stable valence state of RE is 3+, which highly imposes a 3+ valence state to the (VO 4 ) 3– in the electronic spin state.…”

Laser-scribed Graphene Electrodes Functionalized with Nafion/Fe3O4Nanohybrids for the Ultrasensitive Detection of Neurotoxin Drug Clioquinol

“…The good correlation coefficient ( R 2 ) 0.996 and the linear regression equation I pa (μA) = 0.276 [CQL (nM)] + 8.626 imply that CQL oxidation is controlled, which is consistent with an earlier report. 2 − 4 Furthermore, the plot of the logarithmic peak current against the concentration of CQL ( Figure S3c ) is a straight line and corresponds to a regression equation of I pa (μA) = 0.455 [CQL (nM)] + 0.536 ( R 2 = 0.992). Based on these findings, the catalytic reaction in the Nafion/Fe 3 O 4 /LSG sensor is driven by first-order kinetics.…”

“…Finally, the semiquinone intermediate underwent a disproportionation reaction to generate CQL and a p -quinone intermediate. 3 , 4 , 11 , 79 …”

Surface engineering of gadolinium oxide nanoseeds with nitrogen-doped carbon quantum dots: an efficient nanocomposite for precise detection of antibiotic drug clioquinol

“…Initially, the phenol group in the CQL undergoes the electro-oxidation reaction by losing one proton (1 H + ) and one electron (1 e À1 ) which forms the phenoxy radical, which is further oxidized to a quinone like structure. [33][34][35] Notably, the N-CQD@Gd 2 O 3 /GCE has an I pa value that is 2 and 7.4 times that of Gd 2 O 3 /GCE, and bare GCE respectively. The results imply that the electrocatalytic oxidation of CQL is more facile at the surface of the N-CQD@Gd 2 O 3 nanocomposite.…”