Electrocatalytic activity of salicylic acid on the platinum nanoparticles modified electrode by electrochemical deposition

Abstract Numerous studies suggest that modification with functional nanomaterials can enhance the electrode electrocatalytic activity, sensitivity, and selectivity of the electrochemical sensors. Here, a highly sensitive and cost-effective disposable non-enzymatic glucose sensor based on copper(II)/reduced graphene oxide modified screen-printed carbon electrode is demonstrated. Facile fabrication of the developed sensing electrodes is carried out by the adsorption of copper(II) onto graphene oxide modified electrode, then following the electrochemical reduction. The proposed sensor illustrates good electrocatalytic activity toward glucose oxidation with a wide linear detection range from 0.10 mM to 12.5 mM, low detection limit of 65 µM, and high sensitivity of 172 µA mM− 1 cm− 2 along with satisfactory anti-interference ability, reproducibility, stability, and the acceptable recoveries for the detection of glucose in a human serum sample (95.6–106.4%). The copper(II)/reduced graphene oxide based sensor with the superior performances is a great potential for the quantitation of glucose in real samples.

Download Full-text

Development of cobalt oxide film modified electrode decorated with platinum nanoparticles as a biosensing platform for phenol

International Journal of Environmental & Analytical Chemistry ◽

10.1080/03067319.2019.1643462 ◽

2019 ◽

Vol 100 (8) ◽

pp. 873-881

Author(s):

Ceren Kuşcu ◽

K. Volkan Özdokur ◽

Süleyman Koçak ◽

F. Nil Ertaş

Keyword(s):

Oxide Film ◽

Cobalt Oxide ◽

Modified Electrode ◽

Platinum Nanoparticles

Download Full-text

Electro-Oxidation and Simultaneous Determination of Indole-3-Acetic Acid and Salicylic Acid on Graphene Hydrogel Modified Electrode

Sensors ◽

10.3390/s19245483 ◽

2019 ◽

Vol 19 (24) ◽

pp. 5483 ◽

Cited By ~ 2

Author(s):

Xiaodong Cao ◽

Xueting Zhu ◽

Shudong He ◽

Xuan Xu ◽

Yongkang Ye

Keyword(s):

Acetic Acid ◽

Salicylic Acid ◽

Modified Electrode ◽

Limit Of Detection ◽

Simultaneous Detection ◽

Three Dimensional ◽

Linear Sweep Voltammetry ◽

Oxidation Reactions ◽

Sensor Performance ◽

Indole 3 Acetic Acid

A selective and sensitive electrochemical sensor was developed for simultaneous detection of phytohormones indole-3-acetic acid (IAA) and salicylic acid (SA). The sensing interface was fabricated on a porous, three-dimensional networked graphene hydrogel (GH) modified glassy carbon electrode (GCE). The electrocatalytic behavior of IAA and SA on the surface of the modified electrode (GH/GCE) was investigated by cyclic voltammetry and linear sweep voltammetry. Results show that the oxidation reactions of IAA and SA occur at different potentials, which enable their simultaneous detection at the sensing interface. Under optimal conditions, the GH/GCE exhibited good selectivity and stability and its response, unaffected by various interferents, was linear in the range of 4 to 200 μM of IAA and SA. The limit of detection (S/N = 3) achieved were 1.42 μM for IAA and 2.80 μM for SA. The sensor performance was validated by measuring for IAA and SA in real vegetable samples with satisfactory results.

Download Full-text

Highly Sensitive Detection of Dopamine at Ionic Liquid Functionalized RGO/ZIF-8 Nanocomposite-Modified Electrode

Journal of Nanomaterials ◽

10.1155/2019/8936095 ◽

2019 ◽

Vol 2019 ◽

pp. 1-9 ◽

Cited By ~ 2

Author(s):

Lei Cheng ◽

Youjun Fan ◽

Xingcan Shen ◽

Hong Liang

Keyword(s):

Ionic Liquid ◽

Modified Electrode ◽

Electrocatalytic Activity ◽

Electrochemical Impedance ◽

Modified Electrodes ◽

Differential Pulse ◽

Zeolitic Imidazolate Framework ◽

Response Range ◽

Highly Sensitive ◽

Highly Sensitive Detection

A hybrid and hierarchical nanocomposite was successfully prepared by the growth of zeolitic imidazolate framework-8 (ZIF-8) on the template of ionic liquid (IL, [Bmim][BF4]) functionalized reduced graphene oxide (IL-RGO). The structure and morphology of the IL-RGO/ZIF-8 nanocomposite were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectrometer (FTIR), and Raman spectroscopy. The results showed that RGO sheets were refrained from restacking by IL, and ZIF-8 nanoparticles grew well on the surface of IL-RGO. Owing to the synergistic effect from large surface area and excellent electrocatalytic activity of ZIF-8 and great electrical conductivity of IL-RGO, a highly sensitive sensor for dopamine (DA) can be obtained. IL-RGO/ZIF-8-modified electrode exhibits good electrocatalytic activity and electroconductive properties towards DA which were investigated by cyclic voltammetry (CV), differential pulse voltammetry (DPV), and electrochemical impedance spectroscopy (EIS). Compared with bare or IL-RGO-modified electrodes, the IL-RGO/ZIF-8-modified electrode effectively depressed the oxidation overpotential of DA. The linear response range of DA was from 1.0×10−7 to 1.0×10−4 mol/L with a low detection of limit 3.5×10−8 mol/L. In addition, the sensor was shown to provide satisfactory stability for the determination of DA.

Download Full-text