One‐pot Electro‐polymerized SDPAS/PPy/CNTs Modified Electrode for Selective Detection of Dopamine

Abstract

To improve the performance of dopamine (DA) detection in the presence of ascorbic acid (AA) and uric acid (UA), sodium diphenylamine sulfonate/polypyrrole/multi‐walled carbon nanotubes (SDPAS/PPy/CNTs) film was fabricated on the surface of gold electrode through one‐pot polymerization initiated by electrochemical oxidation. SDPAS were covalently embedded into the backbone of PPy to endow the resultant film with numerous negative‐charged terminals, resulting in selective pre‐adsorption of protonated DA+ on the electrode and switching the following anodic reaction to be an adsorption‐controlled process. The detection of DA in the presence of AA and UA by square wave voltammetry method showed an outstanding repeatability with the relative standard deviation of 0.45 %. A good linear relationship was observed between the oxidative peak current and the concentration of DA in the range of 0.827–104 μM (R2=0.993), and the limit of detection (LOD) was calculated to be 0.105 μM (S/N=3).

Multilayer Carbon Nanotube/Gold Nanoparticle Composites on Gallium-Based Liquid Metals for Electrochemical Biosensing

“…We found that Au NP functionalization much improved the linearity from 75 nM compared with the CNT layer itself (450 nM). The liquid metal-based DA sensors exhibited a sensitivity of 0.236 ± 0.013 μA/μM and an LOD of 23.2 nM ( S / N = 3); those values are competitive compared to those of other carbon and gold nanostructures on mechanically rigid platforms that are tabulated in Table . ,,− ,,− All CV curves with DA concentrations to obtain the anodic peaks are shown in Figure S8.…”

Bionanotube/Poly(3,4-ethylenedioxythiophene) Nanohybrid as an Electrode for the Neural Interface and Dopamine Sensor

“…The PDA@CNTs–PEDOT-coated electrode exhibited a good selectivity for electrochemical detection of DA in the presence of UA, AA, and Tryp. The sensitivity was found to be 7.35 μA/M, and the detection limit was 0.62 μm/L, which was better than the other PEDOT-based electrodes reported previously. , Increased sensor activity might be due to the electrostatic interaction between the negatively PDA@CNTs present in PDA@CNTs–PEDOT composite and positively charged DA . In addition, the PDA@CNTs–PEDOT sensor was applied for detection of DA in the human serum sample.…”

Pd‐Ni/Cd loaded PPy/Ti composite electrode: Synthesis, characterization, and application for hydrogen storage

“…A typical XPS survey spectrum for a Pd 36 ‐Ni 7 /Cd 57 /PPy/Ti electrode is displayed in Figure A, which further confirms the existence of C, O, Pd, Ni, and Cd elements in the film. The C1s spectrum (Figure B) exhibits two peaks, which are assigned to the C―C/C = C (284.7 eV) bands and the C―N bond (285.6 eV) in the PPy ring, respectively . Figure C depicts the binding energies located at 404.8 eV (Cd 3d5/2) and 411.6 eV (Cd 3d3/2), which are attributed to the presence of metallic cadmium Cd(0) .…”

“…The C1s spectrum ( Figure 7B) exhibits two peaks, which are assigned to the C-C/C = C (284.7 eV) bands and the C-N bond (285.6 eV) in the PPy ring, respectively. 43,44 Figure 7C depicts the binding energies located at 404.8 eV (Cd 3d5/2) and 411.6 eV (Cd 3d3/2), which are attributed to the presence of metallic cadmium Cd(0). 45 The content of Cd (II) was too small to be detected by XPS.…”