Phytic acid/graphene oxide nanocomposites modified electrode for electrochemical sensing of dopamine

2017 ◽  
Vol 71 ◽  
pp. 1086-1089 ◽  
Author(s):  
Donglei Wang ◽  
Fei Xu ◽  
Jiajie Hu ◽  
Meng Lin
Keyword(s):  
Graphene Oxide ◽  
Phytic Acid ◽  
Modified Electrode ◽  
Electrochemical Sensing

Reduced graphene oxide/graphene oxide hybrid-modified electrode for electrochemical sensing of tobramycin

2018 ◽  
Vol 73 (2) ◽  
pp. 291-299 ◽  
Author(s):  
Mojtaba Hadi ◽  
Tahere Mollaei
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Modified Electrode ◽  
Electrochemical Sensing ◽  
Reduced Graphene

Electrochemical sensing based on graphene oxide/Prussian blue hybrid film modified electrode

2011 ◽  
Vol 56 (3) ◽  
pp. 1239-1245 ◽  
Author(s):  
Yao Zhang ◽  
Xiumei Sun ◽  
Longzhang Zhu ◽  
Hebai Shen ◽  
Nengqin Jia
Keyword(s):  
Graphene Oxide ◽  
Prussian Blue ◽  
Modified Electrode ◽  
Hybrid Film ◽  
Electrochemical Sensing

Electrochemical sensing of dopamine at the surface of a dopamine grafted graphene oxide/poly(methylene blue) composite modified electrode

RSC Advances ◽  
2016 ◽  
Vol 6 (24) ◽  
pp. 19982-19991 ◽  
Author(s):  
Demudu Babu Gorle ◽  
Manickam Anbu Kulandainathan
Keyword(s):  
Methylene Blue ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Glassy Carbon Electrode ◽  
Modified Electrode ◽  
Glassy Carbon ◽  
Electrode Surface ◽  
Electrochemical Sensing ◽  
Carbon Electrode ◽  
Reduced Graphene

We prepared a reduced graphene oxide/poly(methylene blue) composite on a glassy carbon electrode surface and electrografted dopamine onto the surface for the sensing of dopamine.

scholarly journals Facile Preparation of Cu2O Nanoparticles and Reduced Graphene Oxide Nanocomposite for Electrochemical Sensing of Rhodamine B

Nanomaterials ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 958 ◽  
Author(s):  
Quanguo He ◽  
Jun Liu ◽  
Yaling Tian ◽  
Yiyong Wu ◽  
Felista Magesa ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Modified Electrode ◽  
Rhodamine B ◽  
Dynamic Range ◽  
Oxidation Potential ◽  
Electrochemical Sensing ◽  
Reduced Graphene ◽  
Cu2o Nanoparticles

In this paper, the preparation, characterization, and electrochemical application of Cu2O nanoparticles and an electrochemical reduced graphene oxide nanohybrid modified glassy carbon electrode (denoted as Cu2O NPs‒ERGO/GCE) are described. This modified electrode was used as an electrochemical sensor for the catalytic oxidation of rhodamine B (RhB), and it exhibited an excellent electrochemical performance for RhB. The oxidation potential of RhB was decreased greatly, and the sensitivity to detect RhB was improved significantly. Under optimum conditions, a linear dynamic range of 0.01–20.0 μM and a low detection limit of 0.006 μM were obtained with the Cu2O NPs‒ERGO/GCE by using second‒order derivative linear sweep voltammetry. In addition, the selectivity of the prepared modified electrode was analyzed for the determination of RhB. The practical application of this sensor was investigated for the determination of RhB in food samples, and satisfactory results were obtained.

scholarly journals Paper-Based Biosensor for Glucose and Paracetamol Sensing using Chitosan/ Graphene Oxide Modified Electrode

2020 ◽  
Vol 10 (02) ◽  
pp. 295-300
Author(s):  
Ruri Agung Wahyuono ◽  
Roekmono . ◽  
Harsono Hadi ◽  
Hilya Nur Imtihani
Keyword(s):  
Graphene Oxide ◽  
Modified Electrode ◽  
Glucose Sensing ◽  
Electrochemical Sensing ◽  
X Ray Diffraction ◽  
Electron Transfer Mechanism ◽  
X Ray ◽  
Solution Interface ◽  
Impedance Data ◽  
Analyte Solution

This work presents the development of chitosan/ graphene oxide modified paper-based electrode for electrochemical sensing of glucose and paracetamol. Preparation of the modified paper-based electrode was described, and several characterizations using X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and scanning electron microscopy (SEM) were carried out to evaluate the physical, electronic, and microstructural properties of chitosan/ graphene oxide layer. The electrochemical performance of the modified electrode was evaluated preliminary using impedance spectroscopy, and the electrochemical detection of both glucose and paracetamol in simulated urine was assessed using cyclic voltammetry (CV). Impedance data reveals that the electron transfer mechanism at the electrode/ analyte solution interface occurs faster with increasing concentration of the analyte. CV-based measurements exhibit a linear response for analyte concentration ranging between 2.5 and 100 μM. In addition, irrespective of the analyte, the sensitivity increases with an additional fraction of graphene oxide in the modified paper-based electrode. The highest sensitivity for glucose sensing is 4.4 mA.mM-1, while the highest sensitivity for paracetamol sensing is 16 mA.mM-1, by using electrode coated with chitosan/ graphene oxide (5%, %w) composites.

Selective Electrochemical Sensing of Hemoglobin from Blood of β-Thalassemia Major Patients by Tellurium Nanowires-Graphene Oxide Modified Electrode

2021 ◽  
pp. 129706
Author(s):  
Hafiza Sana Rafiq ◽  
Batool Fatima ◽  
Dilshad Hussain ◽  
Abrar Mohyuddin ◽  
Saadat Majeed ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Modified Electrode ◽  
Thalassemia Major ◽  
Electrochemical Sensing ◽  
Tellurium Nanowires

scholarly journals Paper-Based Competitive Immunochromatography Coupled with an Enzyme-Modified Electrode to Enable the Wireless Monitoring and Electrochemical Sensing of Cotinine in Urine

Sensors ◽  
2021 ◽  
Vol 21 (5) ◽  
pp. 1659
Author(s):  
Nutcha Larpant ◽  
Pramod K. Kalambate ◽  
Tautgirdas Ruzgas ◽  
Wanida Laiwattanapaisal
Keyword(s):  
Glucose Oxidase ◽  
Modified Electrode ◽  
Near Field ◽  
Electrochemical Measurement ◽  
Electrochemical Sensing ◽  
Urine Samples ◽  
Lateral Flow Strip ◽  
Wireless Monitoring ◽  
Sensing Platform ◽  
Combined Strategy

This paper proposes a combined strategy of using paper-based competitive immunochromatography and a near field communication (NFC) tag for wireless cotinine determination. The glucose oxidase labeled cotinine antibody specifically binds free cotinine in a sample, whereas the unoccupied antibody attached to BSA-cotinine at the test line on a lateral flow strip. The glucose oxidase on the strip and an assistant pad in the presence of glucose generated H2O2 and imposed the Ag oxidation on the modified electrode. This enabled monitoring of immunoreaction by either electrochemical measurement or wireless detection. Wireless sensing was realized for cotinine in the range of 100–1000 ng/mL (R2 = 0.96) in PBS medium. Undiluted urine samples from non-smokers exhibited an Ag-oxidation rate three times higher than the smoker’s urine samples. For 1:8 diluted urine samples (smokers), the proposed paper-based competitive immunochromatography coupled with an enzyme-modified electrode differentiated positive and negative samples and exhibited cotinine discrimination at levels higher than 12 ng/mL. This novel sensing platform can potentially be combined with a smartphone as a reader unit.

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