Noncovalently copper-porphyrin functionalized reduced graphene oxide for sensitive electrochemical detection of dopamine

2018 ◽  
Vol 22 (09n10) ◽  
pp. 853-862 ◽  
Author(s):  
Dong-Lan Huang ◽  
Jian Wang ◽  
Hui-Qing Yuan ◽  
Hui-Shi Guo ◽  
Xiao Ying ◽  
...  
Keyword(s):  
Electrochemical Detection ◽  
Electrochemical Impedance ◽  
Differential Pulse ◽  
Visible Spectroscopy ◽  
Glass Carbon Electrode ◽  
Copper Porphyrin ◽  
Reduced Graphene ◽  
Glass Carbon ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

The nanocomposite of an electron-deficient flat tetrakis-(ethoxycarbonyl) porphyrin copper(II) (Cu-TECP) and reduced grapheme oxide (RGO) was prepared and used for electrochemical detection of dopamine (DA). The prepared nanocomposite was characterized by scanning electron microscopy, Raman spectroscopy, FT-IR spectroscopy, ultraviolet-visible spectroscopy and electrochemical impedance spectroscopy. Electrochemical studies of the modified glass carbon electrode (GCE) were carried out by the cyclic voltammetry and differential pulse voltammograms (DPV) methods. The RGO/Cu-TECP/GCE exhibited enhanced electrocatalytic activity towards the detection of dopamine (DA). The detection limit was 0.58 μM, while the linear range was from 2 to 200 μM ([Formula: see text] 0.997).

scholarly journals Simultaneous Detection of Ascorbic Acid, Dopamine, and Uric Acid Using a Novel Electrochemical Sensor Based on Palladium Nanoparticles/Reduced Graphene Oxide Nanocomposite

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Yuyun Wei ◽  
Yangyang Liu ◽  
Zhifang Xu ◽  
Shenjun Wang ◽  
Bo Chen ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Uric Acid ◽  
Palladium Nanoparticles ◽  
Electrochemical Impedance ◽  
Simultaneous Detection ◽  
Differential Pulse ◽  
Fast Response ◽  
Electrochemical Performances ◽  
Glass Carbon Electrode ◽  
Glass Carbon

A fresh strategy based on two-step electrochemical reduction for the fabrication of palladium nanoparticles/reduced oxide nanocomposite-modified glass carbon electrode (PdNPs/rGO/GCE) was established in this study. Field emission scanning electron microscopy (FESEM) images showed that spherical PdNPs were evenly distributed on the surface of rGO-modified electrode (rGO/GCE), and the introduction of PdNPs has no effect on the morphology of rGO. Electrochemical impedance spectroscopy (EIS) studies revealed that the conductivity of PdNPs/rGO/GCE was higher than that of rGO/GCE and bare GCE. The electrochemical performances of PdNPs/rGO/GCE sensor were investigated by cyclic voltammetry (CV), differential pulse voltammetry (DPV), and chronoamperometry using ascorbic acid (AA), dopamine (DA), and uric acid (UA) as analytes. At the optimized conditions, wide linear ranges of 0.5–3.5 mM (R2 = 0.99), 3–15 μM (R2 = 0.99) and 15–42 μM (R2 = 0.99), and 0.3–1.4 mM (R2 = 0.99) towards AA, DA, and UA in ternary mixture were observed, respectively. In addition to superior anti-interference capability, fast response (≤5 s), excellent reproducibility, and good long-term stability were also given by this sensor. These results suggested that PdNPs/rGO/GCE is promising for the simultaneous detection of AA, DA, and UA in practical application.

scholarly journals Supramolecular assemblies of carbon nanocoils and tetraphenylporphyrin derivatives for sensing of catechol and hydroquinone in aqueous solution

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Syeda Aqsa Batool Bukhari ◽  
Habib Nasir ◽  
Lujun Pan ◽  
Mehroz Tasawar ◽  
Manzar Sohail ◽  
...  
Keyword(s):  
Electrochemical Impedance ◽  
Limit Of Detection ◽  
Linear Trend ◽  
Differential Pulse ◽  
Peak Potential ◽  
Limit Of Quantification ◽  
Efficient Detection ◽  
Good Repeatability ◽  
Ft Ir ◽  
Pulse Voltammetry

AbstractNon-enzymatic electrochemical detection of catechol (CC) and hydroquinone (HQ), the xenobiotic pollutants, was carried out at the surface of novel carbon nanocoils/zinc-tetraphenylporphyrin (CNCs/Zn-TPP) nanocomposite supported on glassy carbon electrode. The synergistic effect of chemoresponsive activity of Zn-TPP and a large surface area and electron transfer ability of CNCs lead to efficient detection of CC and HQ. The nanocomposite was characterized by using FT-IR, UV/vis. spectrophotometer, SEM and energy dispersive X-ray spectroscopy (EDS). Cyclic voltammetry, differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy were used for the electrochemical studies. CNCs/Zn-TPP/GCE nanosensor displayed a limit of detection (LOD), limit of quantification (LOQ) and sensitivity for catechol as 0.9 µM, 3.1 µM and 0.48 µA µM−1 cm−2, respectively in a concentration range of 25–1500 µM. Similarly, a linear trend in the concentration of hydroquinone detection was observed between 25 and 1500 µM with an LOD, LOQ and sensitivity of 1.5 µM, 5.1 µM and 0.35 µA µM−1 cm−2, respectively. DPV of binary mixture pictured well resolved peaks with anodic peak potential difference, ∆Epa(CC-HQ), of 110 mV showing efficient sensing of CC and HQ. The developed nanosensor exhibits stability for up to 30 days, better selectivity and good repeatability for eight measurements (4.5% for CC and 5.4% for HQ).

scholarly journals Biferrocenyl Schiff bases as efficient corrosion inhibitors for an aluminium alloy in HCl solution: a combined experimental and theoretical study

RSC Advances ◽  
2020 ◽  
Vol 10 (13) ◽  
pp. 7585-7599 ◽  
Author(s):  
Uzma Nazir ◽  
Zareen Akhter ◽  
Naveed Kausar Janjua ◽  
Muhammad Adeel Asghar ◽  
Sehrish Kanwal ◽  
...  
Keyword(s):  
Schiff Bases ◽  
Theoretical Study ◽  
Electrochemical Impedance ◽  
Electron Microscopic ◽  
Loss Analysis ◽  
Tafel Polarization ◽  
Electron Microscopic Technique ◽  
Scanning Electron Microscopic ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

The anticorrosion activity of biferrocenyl Schiff bases on AA2219-T6 in acidic medium were studied using Tafel polarization, electrochemical impedance spectroscopy, weight loss analysis, FT-IR spectroscopy and scanning electron microscopic technique.

Electrochemical detection of trace heavy metal ions using a Ln-MOF modified glass carbon electrode

2020 ◽  
Vol 281 ◽  
pp. 121032 ◽  
Author(s):  
Wei Ye ◽  
Yanping Li ◽  
Jintong Wang ◽  
Bin Li ◽  
Yuanjing Cui ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Electrochemical Detection ◽  
Heavy Metal Ions ◽  
Carbon Electrode ◽  
Glass Carbon Electrode ◽  
Glass Carbon

scholarly journals Congo Red and Nigrosine Dye Degradation using Dimethyl Dioxirane as an Oxidising Agent

2021 ◽  
Vol 37 (5) ◽  
pp. 1221-1228
Author(s):  
S. Vinotha ◽  
A.Leema Rose
Keyword(s):  
Congo Red ◽  
Room Temperature ◽  
Functional Group ◽  
Dye Degradation ◽  
Visible Spectroscopy ◽  
Before And After ◽  
Ft Ir ◽  
Combined Action ◽  
Uv Visible ◽  
Ft Ir Spectroscopy

The advanced oxidation of Congo red (CR) and Nigrosine (NI) using the combined action of dimethyl dioxirane as an oxidising agent is described in this study. The effects of several parameters, such as the concentration of the oxidising agent, the initial dye concentration, and the pH, have been investigated. At room temperature, the oxidising agent dimethyl dioxirane was employed to test the degradation of CR and NI dyes. On the degradation efficiency of CR and NI, pH’s effects, oxidising agent, and initial dye concentration were examined. The absorbance of CR and NI dyes before and after degradation was measured using UV-visible spectroscopy. The functional group existing in the dyes before and after degradation was determined using FT-IR spectroscopy.

Preparation of CuPc/RGO Nanocomposites and Their Electrocatalytic Behaviors for Oxygen Reduction Reaction

2016 ◽  
Vol 19 (4) ◽  
pp. 193-198
Author(s):  
Guofang Zuo ◽  
Peng Wang ◽  
Zhifeng Li ◽  
Jiandong Yang
Keyword(s):  
Oxygen Reduction Reaction ◽  
Oxygen Reduction ◽  
Copper Phthalocyanine ◽  
Reduction Reaction ◽  
Electrochemical Behaviors ◽  
Glass Carbon Electrode ◽  
Reduced Graphene ◽  
Electrocatalytic Oxygen Reduction ◽  
Glass Carbon ◽  
Π Stacking Interaction

In this paper, copper phthalocyanine/reduced graphene oxide (CuPc/RGO) nanocomposites were synthesized by aromatic π-π stacking interaction and well characterized by scanning electron microscopy (SEM) and fluorescence spectrometry. The composites were modified on the surface of glass carbon electrode (GCE) and their electrochemical behaviors of CuPc/RGO for electrocatalytic oxygen reduction reaction (ORR) were studied by cyclic voltammetry (CV). The study showed when the mass ratio of RGO to CuPc in composite achieved 1:1, the composite film performed excellent electrocatalytic activity towards the ORR.

scholarly journals Electrochemical Immunoassay ofEscherichia coliO157:H7 Using Ag@SiO2Nanoparticles as Labels

2014 ◽  
Vol 2014 ◽  
pp. 1-7 ◽  
Author(s):  
Guang-Zhu Chen ◽  
Zheng-Zhi Yin ◽  
Jv-Feng Lou
Keyword(s):  
Hydrofluoric Acid ◽  
Differential Pulse ◽  
Glass Carbon Electrode ◽  
E Coli ◽  
Mixed Acid ◽  
Diallyldimethylammonium Chloride ◽  
Transmission Electron ◽  
Glass Carbon ◽  
Sandwich Type ◽  
Pulse Voltammetry

Silica coated silver (Ag@SiO2) nanoparticles were prepared and characterized by transmission electron microscope (TEM) and UV-vis absorption, and the nanoparticles were used as labels in sandwich-type immunosensor ofEscherichia coliO157:H7 (E. coliO157:H7). The labels involved in immunoreaction were dissolved by mixed acid of hydrofluoric acid and nitric acid, and the released Ag+ions were electrochemical stripping analyzed (via differential pulse voltammetry, DPV) at poly(acrylic acid)/poly(diallyldimethylammonium chloride)/carbon nanotubes (PAA/PDCNT) modified glass carbon electrode (GCE), which obviously enhanced the signal of Ag+stripping. Then, the number ofE. coliO157:H7 could be indirectly reflected by the signal intensity of labeled Ag+. And the results showed that the DPV signals were proportional to the logarithm of theE. coliO157:H7 concentration in the range from 20 cfu/mL to8.0×103 cfu/mL with the detection limit of 13 cfu/mL.

Synthesis and Capacitance of Multi-Walled Carbon Nanotube/Polyaniline Nanocomposites

2013 ◽  
Vol 834-836 ◽  
pp. 108-111
Author(s):  
Qi Guan Wang ◽  
Wei Zhou ◽  
Su Min Wang ◽  
Wen Zhi Zhang ◽  
Jian Ping Li ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Carbon Nanotube ◽  
Ir Spectroscopy ◽  
Electrochemical Polymerization ◽  
Visible Spectroscopy ◽  
Multi Walled Carbon Nanotube ◽  
Pani Composite ◽  
Vis Spectroscopy ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

We report on the synthesis and electrochemical properties of multi-walled carbon nanotube (MWNT)/polyaniline (PANI) nanocomposites. The MWNT/PANI composite was prepared through electrochemical polymerization and is confirmed by ultraviolet-visible spectroscopy (UV-vis) spectroscopy and Fourier transform infrared (FT-IR) spectroscopy. The MWNT/PANI nanocomposites show a specific capacitance value as high as 463 F/g.

The effective determination of Cd(ii) and Pb(ii) simultaneously based on an aluminum silicon carbide-reduced graphene oxide nanocomposite electrode

The Analyst ◽  
2017 ◽  
Vol 142 (15) ◽  
pp. 2741-2747 ◽  
Author(s):  
Yale Wu ◽  
Tao Yang ◽  
Kuo-Chih Chou ◽  
Junhong Chen ◽  
Lei Su ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Glass Carbon Electrode ◽  
Reduced Graphene ◽  
Glass Carbon ◽  
Aluminum Silicon Carbide ◽  
First Time ◽  
Aluminum Silicon

A platform for the simultaneous determination of Cd(ii) and Pb(ii) in aqueous solution has been applied using an aluminum silicon carbide-reduced graphene oxide (Al4SiC4–RGO) nanocomposite modified glass carbon electrode (GCE) for the first time.

Sign in / Sign up

Export Citation Format

Share Document