scholarly journals Novel Aminosilane (APTES)-Grafted Polyaniline@Graphene Oxide (PANI-GO) Nanocomposite for Electrochemical Sensor

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2562
Author(s):  
Raja Saad Alruwais ◽  
Waheed A. Adeosun ◽  
Hadi M. Marwani ◽  
Mohammad Jawaid ◽  
Abdullah M. Asiri ◽  
...  
Keyword(s):  
Electrochemical Detection ◽  
Chemical Method ◽  
Limit Of Detection ◽  
Anthropogenic Activities ◽  
Linear Sweep Voltammetry ◽  
Toxic Element ◽  
Current Response ◽  
Sample Analysis ◽  
Linear Sweep ◽  
Real Sample Analysis

Lead is a potentially toxic element (PTE) that has several adverse medical effects in humans. Its presence in the environment became prominent due to anthropogenic activities. The current study explores the use of newly developed composite materials (organic–inorganic hybrid) based on PANI-GO-APTES for electrochemical detection of Pb2+ in aqueous solution. The composite material (PANI-GO-APTES) was synthesized by chemical method and was characterized with SEM, XPS, XEDS, XRD, TGA, FTIR, EIS and CV. The result of characterization indicates the successful synthesis of the intended material. The PANI-GO-APTES was successfully applied for electrochemical detection of Pb2+ using cyclic voltammetry and linear sweep voltammetry method. The limit of detection of Pb2+ was 0.0053 µM in the linear range of 0.01 µM to 0.4 µM. The current response produced during the electrochemical reduction of Pb2+ catalyzed by PANI-GO-APTES was also very repeatable, reproducible and rapid. The application of PANI-GO-APTES-modified GCE in real sample analysis was also established. Therefore, PANI-GO-APTES is presented as a potential Pb2+ sensor for environmental and human health safety.

scholarly journals Manufacturing Process of Polymeric Microneedle Sensors for Mass Production

Micromachines ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1364
Author(s):  
Jae Yun Baek ◽  
Kyung Mook Kang ◽  
Hyeong Jun Kim ◽  
Ju Hyeon Kim ◽  
Ju Hwan Lee ◽  
...  
Keyword(s):  
Cyclic Voltammetry ◽  
Electrochemical Detection ◽  
Mass Production ◽  
Interstitial Fluid ◽  
Linear Sweep Voltammetry ◽  
Sensor Surface ◽  
Linear Sweep ◽  
Thermal Compression ◽  
Stencil Mask ◽  
Sensor Fabrication

In this work, we present a fabrication process for microneedle sensors made of polylactic acid (PLA), which can be utilized for the electrochemical detection of various biomarkers in interstitial fluid. Microneedles were fabricated by the thermal compression molding of PLA into a laser machined polytetrafluoroethylene (PTFE) mold. Sensor fabrication was completed by forming working, counter, and reference electrodes on each sensor surface by Au sputtering through a stencil mask, followed by laser dicing to separate individual sensors from the substrate. The devised series of processes was designed to be suitable for mass production, where multiple microneedle sensors can be produced at once on a 4-inch wafer. The operational stability of the fabricated sensors was confirmed by linear sweep voltammetry and cyclic voltammetry at the range of working potentials of various biochemical molecules in interstitial fluid.

An Amperometric Biosensor Based on a Multi-Nanoporous SnO2/HRP/Chitosan for Detection of Hydrogen Peroxide in Human Urine Samples

2019 ◽  
Vol 17 (10) ◽  
pp. 769-776
Author(s):  
Samiul Alim ◽  
Rajan Jose ◽  
Mashitah M. Yusoff ◽  
A. K. M. Kafi
Keyword(s):  
Hydrogen Peroxide ◽  
Horseradish Peroxidase ◽  
Glassy Carbon ◽  
Human Urine ◽  
Limit Of Detection ◽  
Amperometric Biosensor ◽  
Carbon Electrode ◽  
Sample Analysis ◽  
Real Sample Analysis ◽  
Effects Of Ph

A new amperometric biosensor fabricated from a multi-nanoporous SnO2 and HRP was trialled. The multiporous SnO2 nanofiber was fabricated in the research lab. Horseradish peroxidase was co-immobilized on a glassy carbon electrode with the multiporous SnO2 nanofiber and chitosan. The FESEM and EDX analysis were used to study the nanostructure and composition details of the nanofiber. Electrochemical results established that the immobilized HRP exhibited direct electrochemical behavior toward hydrogen peroxide (H2O2). The effects of pH, and applied potentials on the biosensor were also investigated. The limit of detection which was found to be 5 × 10–7 M with the linear range being between 5 × 10–6 M to 1.2 × 10–4 M of H2O2. For real sample analysis, this biosensor showed that the H2O2 concentration in the human urine can be monitored conveniently, where the interference is noted to be negligible.

scholarly journals A glassy carbon electrode modified with γ-Ce2S3-decorated CNT nanocomposites for uric acid sensor development: a real sample analysis

RSC Advances ◽  
2017 ◽  
Vol 7 (24) ◽  
pp. 14649-14659 ◽  
Author(s):  
Mohammed M. Rahman ◽  
Jahir Ahmed ◽  
Abdullah M. Asiri
Keyword(s):  
Uric Acid ◽  
Carbon Nanotube ◽  
Chemical Method ◽  
Carbon Electrode ◽  
Sample Analysis ◽  
Wet Chemical Method ◽  
Real Sample Analysis ◽  
Sensor Development ◽  
Multi Walled Carbon Nanotube ◽  
Wet Chemical

γ-Ce2S3-decorated multi-walled carbon nanotube nanocomposite (Ce2S3-CNT NC) was synthesized by a wet chemical method in basic media.

PREPARATION OF AN ELECTRODE MODIFIED WITH A THERMOSTABLE ENZYME BACILLUS SUBTILIS COTA BY ELECTRODEPOSITION

2012 ◽  
Vol 06 ◽  
pp. 150-155
Author(s):  
TOSHIO WATANABE ◽  
YOHEI YAMADA ◽  
JUNKO MOTONAKA ◽  
TOMOKI YABUTANI ◽  
HARUHIKO SAKURABA ◽  
...  
Keyword(s):  
Bacillus Subtilis ◽  
Modified Electrode ◽  
Linear Sweep Voltammetry ◽  
Thermostable Enzyme ◽  
Current Response ◽  
Linear Sweep ◽  
Bilirubin Oxidase ◽  
Term Stability ◽  
Long Term Stability

In this study, electrodeposition of thermostable enzyme Bacillus subtilis CotA, which is a laccase and has a bilirubin oxidase (BOD) activity, was investigated. The electrodeposition was operated in a mixture of Bacillus subtilis CotA in the PBS (pH 8.0) and TritonX-100 under applying potential (1100 mV vs. Ag/AgCl for 5 min.). The current response was measured by linear sweep voltammetry technique (LSV). The thermostable enzyme Bacillus subtilis CotA electrodeposited electrode was compared with a mesophile BOD electrodeposited electrode. As a result, the Bacillus subtilis CotA modified electrode showed better sensitivity and long-term stability than the mesophile BOD modified electrode.

Electrochemical detection of tyramine with ITO/APTES/ErGO electrode and its application in real sample analysis

2018 ◽  
Vol 108 ◽  
pp. 76-81 ◽  
Author(s):  
M.Z.H. Khan ◽  
Xiaoqiang Liu ◽  
J. Zhu ◽  
F. Ma ◽  
W. Hu ◽  
...  
Keyword(s):  
Electrochemical Detection ◽  
Real Sample ◽  
Sample Analysis ◽  
Real Sample Analysis

scholarly journals Simultaneous detection of l-aspartic acid and glycine using wet-chemically prepared Fe3O4@ZnO nanoparticles: real sample analysis

RSC Advances ◽  
2020 ◽  
Vol 10 (33) ◽  
pp. 19276-19289 ◽  
Author(s):  
Mohammad Musarraf Hussain ◽  
Abdullah M. Asiri ◽  
Mohammed M. Rahman
Keyword(s):  
Zinc Oxide ◽  
Zinc Oxide Nanoparticles ◽  
Chemical Method ◽  
Simultaneous Detection ◽  
Oxide Nanoparticles ◽  
Sample Analysis ◽  
Wet Chemical Method ◽  
Zno Nps ◽  
Real Sample Analysis ◽  
Wet Chemical

An easy and reliable wet-chemical method was used to synthesize iron oxide doped zinc oxide nanoparticles (Fe3O4@ZnO NPs) at a low-temperature under alkaline medium.

The voltammetric determination of Mo in seawater after adsorptive accumulation of the Eriochrome Blue Black R complex

1987 ◽  
Vol 65 (5) ◽  
pp. 957-960 ◽  
Author(s):  
S. N. Willie ◽  
S. S. Berman ◽  
J. A. Page ◽  
G. W. VanLoon
Keyword(s):  
Limit Of Detection ◽  
Reference Electrode ◽  
Direct Determination ◽  
Linear Sweep Voltammetry ◽  
Linear Sweep ◽  
Negative Direction ◽  
Seawater Samples ◽  
Certified Values ◽  
A Current

A method for direct determination of molybdenum in seawater has been developed, and uses linear sweep voltammetry after adsorptive accumulation of the Erichrome Blue Black R (EBBR) complex on a static mercury drop electrode. To an acidified (pH 1.6) seawater (SW) sample, 6.0 × 10−6 M EBBR is added and preconcentration by adsorption is carried out for 30 s at a potential of −0.05 V vs. the Ag/AgCl/SW reference electrode. The potential is then scanned in the negative direction, giving a current peak for the reduction of the Mo—EBBR complex at −0.17 V. Under these conditions the limit of detection is 0.50 ng/mL. Experimental results for Mo in seawater using this technique agree well with certified values for two reference seawater samples (NASS-1, CASS-1).

Effect of cetyltrimethylammonium bromide on the electrochemiluminiscence and electrooxidation of luminol

1983 ◽  
Vol 48 (2) ◽  
pp. 477-483 ◽  
Author(s):  
Jan Lasovský ◽  
František Grambal
Keyword(s):  
Cetyltrimethylammonium Bromide ◽  
Linear Sweep Voltammetry ◽  
Critical Micellar Concentration ◽  
Peak Height ◽  
Anodic Peak ◽  
Alkaline Solutions ◽  
Platinum Electrodes ◽  
Micellar Solutions ◽  
Linear Sweep ◽  
Low Concentrations

The electrooxidation of luminol in alkaline solutions in the presence of cetyltrimethylammonium bromide (I) was studied by linear sweep voltammetry on fixed and vibrating platinum electrodes. The presence of I in low concentrations (below the critical micellar concentration) brings about aggregation of the luminol, which is manifested by an increase in the anodic peak height and its shift towards lower potentials. In micellar solutions the peak height decreases owing to the slower diffusion of the bulkier micelles, the shift to lower potentials being preserved. The light-voltage curves correspond with the voltammetric curves, exhibiting identical shifts of the peak potentials in dependence on the concentration of the surfactant.

scholarly journals Electrochemical Detection of Endosulfan Using an AONP-PANI-SWCNT Modified Glassy Carbon Electrode

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 723
Author(s):  
Kgotla K. Masibi ◽  
Omolola E. Fayemi ◽  
Abolanle S. Adekunle ◽  
Amal M. Al-Mohaimeed ◽  
Asmaa M. Fahim ◽  
...  
Keyword(s):  
Glassy Carbon Electrode ◽  
Glassy Carbon ◽  
Limit Of Detection ◽  
Modified Electrodes ◽  
Antimony Oxide ◽  
Current Response ◽  
Carbon Electrode ◽  
Trace Detection ◽  
Limit Of Quantification ◽  
Walled Carbon Nanotubes

This report narrates the successful application of a fabricated novel sensor for the trace detection of endosulfan (EDS). The sensor was made by modifying a glassy-carbon electrode (GCE) with polyaniline (PANI), chemically synthesized antimony oxide nanoparticles (AONPs), acid-functionalized, single-walled carbon nanotubes (fSWCNTs), and finally, the AONP-PANI-SWCNT nanocomposite. The electrochemical properties of the modified electrodes regarding endosulfan detection were investigated via cyclic voltammetry (CV) and square-wave voltammetry. The current response of the electrodes to EDS followed the trend GCE-AONP-PANI-SWCNT (−510 µA) > GCE-PANI (−59 µA) > GCE-AONPs (−11.4 µA) > GCE (−5.52 µA) > GCE-fSWCNTs (−0.168 µA). The obtained results indicated that the current response obtained at the AONP-PANI-SWCNT/GCE was higher with relatively low overpotential compared to those from the other electrodes investigated. This demonstrated the superiority of the AONP-PANI-SWCNT-modified GCE. The AONP-PANI-SWCNT/GCE demonstrated good electrocatalytic activities for the electrochemical reduction of EDS. The results obtained in this study are comparable with those in other reports. The sensitivity, limit of detection (LoD), and limit of quantification (LoQ) of AONP-PANI-SWCNT/GCE towards EDS was estimated to be 0.0623 µA/µM, 6.8 µM, and 20.6 µM, respectively. Selectivity, as well as the practical application of the fabricated sensor, were explored, and the results indicated that the EDS-reduction current was reduced by only 2.0% when interfering species were present, whilst average recoveries of EDS in real samples were above 97%.

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