One-step preparation of carbon quantum dots-reduced graphene oxide nanocomposite–modified glass carbon electrode for the simultaneous detection of ascorbic acid, dopamine, and uric acid

Yuyun, Wei; Xu, Zhifang; Wang, Shenjun; Liu, Yangyang; Zhang, Di; Fang, Yuxin

doi:10.1007/s11581-020-03703-5

Cited by 16 publications

(3 citation statements)

References 46 publications

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“…Еp (V) = (0.770 ± 0.08) − (0.055 ± 0.007) рН, R 2 = 0.953 (2) According to [20][21][22]38], two electrons and two protons participate in UA electrooxidation (Scheme 1).…”

Section: Effect Of Phmentioning

confidence: 99%

“…The slope of Equation (2) happened to be 0.055 V per pH unit, which suggests that the number of protons and electrons involved in the process of electrooxidation is equal. E p (V) = (0.770 ± 0.08) − (0.055 ± 0.007) pH, R 2 = 0.953 (2) According to [20][21][22]38], two electrons and two protons participate in UA electrooxidation (Scheme 1).…”

Section: Effect Of Potential Scan Ratementioning

confidence: 99%

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Developing Activated Carbon Veil Electrode for Sensing Salivary Uric Acid

et al. 2021

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The paper describes the development of a carbon veil-based electrode (CVE) for determining uric acid (UA) in saliva. The electrode was manufactured by lamination technology, electrochemically activated and used as a highly sensitive voltammetric sensor (CVEact). Potentiostatic polarization of the electrode at 2.0 V in H2SO4 solution resulted in a higher number of oxygen and nitrogen-containing groups on the electrode surface; lower charge transfer resistance; a 1.5 times increase in the effective surface area and a decrease in the UA oxidation potential by over 0.4 V, compared with the non-activated CVE, which was confirmed by energy dispersive X-ray spectroscopy, electrochemical impedance spectroscopy, chronoamperometry and linear sweep voltammetry. The developed sensor is characterized by a low detection limit of 0.05 µM and a wide linear range (0.09–700 µM). The results suggest that the sensor has perspective applications for quick determination of UA in artificial and human saliva. RSD does not exceed 3.9%, and recovery is 96–105%. UA makes a significant contribution to the antioxidant activity (AOA) of saliva (≈60%). In addition to its high analytical characteristics, the important advantages of the proposed CVEact are the simple, scalable, and cost-effective manufacturing technology and the absence of additional complex and time-consuming modification operations.

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“…Еp (V) = (0.770 ± 0.08) − (0.055 ± 0.007) рН, R 2 = 0.953 (2) According to [20][21][22]38], two electrons and two protons participate in UA electrooxidation (Scheme 1).…”

Section: Effect Of Phmentioning

confidence: 99%

Section: Effect Of Potential Scan Ratementioning

confidence: 99%

Developing Activated Carbon Veil Electrode for Sensing Salivary Uric Acid

et al. 2021

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“…Therefore, to avoid these drawbacks, the electrochemical sensor has attracted great attention, for the detection of copper ion, because of their intrinsic advantages such as simple operation, high sensitivity, low cost, rapidity, high sensitivity and selectivity [9]. Notably, the modi cation of the electrode surface with advanced nanomaterials has signi cantly enhanced the sensitivity and selectivity of the sensor [10][11][12]. Among nanostructured materials, nanocomposites have attracted potential in the development of electrochemical sensors.…”

mentioning

confidence: 99%

Development of an impedimetric sensor based on carbon dots and chitosan nanocomposite modified electrode for Cu(II) detection in water

Echabaane

Hfaiedh

Smiri

et al. 2021

J Solid State Electrochem

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The fast and sensitive detection of copper ions would be essential for water monitoring. Herein, we report a novel development of impedimetric sensor based on carbon dots/chitosan nanocomposite. Carbon dots (CDs) were synthesized by simple heating of acidic aqueous solution of glucose. The CDs were characterized by TEM, FTIR, XRD, UV-visible, and PL. These measurements revealed that the CDs possess a mean size of 3.2 nm, graphitic structure with carboxyl and hydroxyl groups on the surface, and show particular optical properties. A glassy carbon electrode (GCE) was modified with a carbon dots/chitosan (CHITO) nanocomposite, and was characterized by transmission electron microscopy and electrochemical impedance spectroscopy (EIS). The CDs-CHITO/GCE electrode exhibits large surface area, good conductivity lm, and charge transfer at interface lm/electrolyte. The proposed impedimetric sensor exhibits a linear response to Cu(II) over 10 -9 M to 10 -5 M rang with a limit of detection at about 5×10 -10 M. In addition, the sensor shows good selectivity toward Cu(II) ions, which is less than 5 %.Therefore, the as-developed impedimetric sensor exhibits good reproducibility, stability, selectivity, and a low limit of detection, which augur well for its application in water safety control processes.

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