Journal ArticleDOI
Synthesis of ZnO nanorods and their application in the construction of a nanostructure-based electrochemical sensor for determination of levodopa in the presence of carbidopa
TLDR
A novel carbon paste electrode modified with ZnO nanorods and 5-(4'-amino-3'-hydroxy-biphenyl-4-yl)-acrylic acid was fabricated and used for the simultaneous determination of levodopa and carbidopa.Abstract:
A novel carbon paste electrode modified with ZnO nanorods and 5-(4'-amino-3'-hydroxy-biphenyl-4-yl)-acrylic acid (3,4'-AAZCPE) was fabricated. The electrochemical study of the modified electrode, as well as its efficiency for the electrocatalytic oxidation of levodopa, is described. The electrode was employed to study the electrocatalytic oxidation of levodopa, using cyclic voltammetry (CV), chronoamperometry (CHA), and square-wave voltammetry (SWV) as diagnostic techniques. It has been found that the oxidation of levodopa at the surface of the modified electrode occurs at a potential of about 370 mV less positive than that of an unmodified carbon paste electrode. The SWV results exhibit a linear dynamic range from 1.0 × 10(-7) M to 7.0 × 10(-5) M and a detection limit of 3.5 × 10(-8) M for levodopa. In addition, this modified electrode was used for the simultaneous determination of levodopa and carbidopa. Finally, the modified electrode was used for the determination of levodopa and carbidopa in some real samples.read more
Citations
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An overview on enzyme-mimicking nanomaterials for use in electrochemical and optical assays
TL;DR: In this paper, an overview of the analytical potential of nanomaterials is presented, which is divided into sections according to their intrinsic nature, non-enzymatic sensor designs (including electrochemical, colorimetric, fluorescent and chemiluminescent methods), and (c), applications of nonenzymatic sensors in the biomedical, environmental and food analysis fields.
Journal ArticleDOI
Recent advances in ZnO nanostructure-based electrochemical sensors and biosensors
TL;DR: The synthesis of ZnO nanostructures and the advances in various Zn O nanostructure-based electrochemical sensors and biosensors for medical diagnosis, pharmaceutical analysis, food safety, and environmental pollution monitoring are discussed.
Journal ArticleDOI
Simultaneous electrochemical determination of dopamine, melatonin, methionine and caffeine
TL;DR: In this article, a carbon paste electrode modified with ZnO nanorods and 3-(4′-amino-3′-hydroxy-biphenyl-4-yl)-acrylic acid (3,4′AAZCPE) was fabricated.
Journal ArticleDOI
Flexible highly specific capacitance aerogel electrodes based on cellulose nanofibers, carbon nanotubes and polyaniline
Chuang Yang,Chuchu Chen,Yuanyuan Pan,Suiyi Li,Fei Wang,Jianyu Li,Li Nana,Xiaoyan Li,Yayun Zhang,Dagang Li +9 more
TL;DR: In this article, a flexible aerogel electrodes for supercapacitors fabricated by freeze-drying combining a cold-press process cellulose nanofibers, multi-walled carbon nanotubes (MWCNTs) and polyaniline (PANI) composite system after polymerized polyanILine onto the surface of the cellulose and carbon Nanotubes by in situ polymerization method.
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Porous graphene oxide nanostructure as an excellent scaffold for label-free electrochemical biosensor: Detection of cardiac troponin I.
TL;DR: This nano-immunosensor demonstrates an outstanding selectivity and high sensitivity towards the human-cTnI analyte and was employed to check the concentration of the MI biomarker in real clinical samples and the results are in good agreement with standard enzyme-linked fluorescence assay (ELFA) method.
References
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Journal ArticleDOI
Nanobelts of Semiconducting Oxides
TL;DR: The beltlike morphology appears to be a distinctive and common structural characteristic for the family of semiconducting oxides with cations of different valence states and materials of distinct crystallographic structures, which could be an ideal system for fully understanding dimensionally confined transport phenomena in functional oxides.
Journal ArticleDOI
Catalytic Growth of Zinc Oxide Nanowires by Vapor Transport
TL;DR: In this paper, the capacitance matrix was calculated for different chain lengths using the software package FastCap MIT (1992) and a ligand shell dielectric constant of 3.14 aF.
Journal ArticleDOI
Recent progress in processing and properties of ZnO
TL;DR: In this paper, the authors summarize recent progress in doping control, materials processing methods such as dry etching and ohmic and Schottky contact formation, new understanding of the role of hydrogen and finally the prospects for control of ferromagnetism in transition metal-doped ZnO.
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Electrochemical Analysis of Some Toxic Metals by Ion–Selective Electrodes
Vinod Kumar Gupta,Mohammad Reza Ganjali,Parviz Norouzi,Hadi Khani,Arunima Nayak,Shilpi Agarwal +5 more
TL;DR: An overview of potentiometric sensors that are capable of detecting toxic heavy metal ions in environmental samples is presented and discussed and several limitations do exist in terms of selectivity, limits of detection, dynamic ranges, applicability to specific problems, and reversibility.