Voltammetric Determination of Dopamine Using Glassy Carbon Electrode Modified with ZnO/Al2O3 Nanocomposite

Abstract

In this work, a new modification strategy was reported to modify a glassy carbon electrode (GCE) based on ZnO/Al 2 O 3 nanocomposite. This modified electrode was designed in order to be used as a sensitive and selective sensor towards detection of trace amount of dopamine (DA). The effective parameters on the optimal performances of the electrode such as pH of the test solution and the applied scan rate during the electrochemical process were also studied. This sensor responded linearly towards detection of dopamine within a wide range of 5.0×10 −6 -7.0×10 −4 M with a low detection limit of 2.0×10 − 6 M (pH=7.0), under the optimum conditions. Moreover, the electrode functioned in the determination of dopamine in real samples was satisfactory.

Electrochemical Detection of Hydrazine by Carbon Paste Electrode Modified with Ferrocene Derivatives, Ionic Liquid, and CoS2-Carbon Nanotube Nanocomposite

“…Considering the accelerated advances in nanoscience, nanomaterials have garnered immense attention for creating newer electrochemical sensors due to their very good electrical conductivity, larger surface areas, and acceptable biocompatibility. − For example, transition-metal sulfides are proposed as one of the active nanomaterials due to their prominent features appropriate for uses in catalysis, energy, and so forth. Particularly, cobalt disulfide (CoS 2 ) is one of the potent materials for electrode modification due to its higher catalytic abilities. , Furthermore, conductivity for sulfides is commonly greater than the corresponding oxides because of their abilities to facilitate the transfer of electrons; additional advantages include higher active-edge position and larger specific surface area for CoS 2 . , To enhance the electronic conductivity and electrochemical performance of CoS 2 , the combination of CoS 2 with carbon nanomaterials is a useful strategy; , CNTs are often deployed to fabricate the composite substances for the new electrode modifiers because of their excellent mechanical features, acceptable physical features, wider potential window, and increased catalytic activities. , …”

Metal and Metal Oxide Based Advanced Ceramics for Electrochemical Biosensors-A Short Review

“…For the detection of glycine, Alam et al Giarola et al (2017) identified that graphite-SiO 2 /Al 2 O 3 /Nb 2 O 5 -methylene blue (GRP-SiAlNb-MB) composite was suitable for the detection of dopamine, DA, in real and pharmaceutical samples with good detection limit. Other works by (Ganjali et al, 2017a;Ganjali et al, 2017b;Ganjali et al, 2018) Rakib et al (2019) and was used for the modification of GCE as a chemical sensor for sensing hazardous chemical 3,4-diaminotoluene. It is clearly understood from the above findings and developments that the dominant properties of alumina particles can be unraveled in the form of nanocomposite with various other metal oxides, metals, polymers, and carbon materials like graphene, graphene oxide.…”

Voltammetric determination of zolpidem by using glassy carbon electrode modified with Ag/ZnO nanoplates

“…Due to the exceptional characteristics of the nanoparticles, they have been used in various industries. Several factors may impact nanoparticles structure including the adopted approach and temperature [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42].…”