An electrochemical paracetamol sensor based on layer-by-layer covalent attachment of MWCNTs and a G4.0 PAMAM modified GCE

2016 ◽  
Vol 8 (10) ◽  
pp. 2218-2225 ◽  
Author(s):  
Yanjun Zhang ◽  
Xiuhui Liu ◽  
Lin Li ◽  
Zhipan Guo ◽  
Zhonghua Xue ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Electrochemical Sensor ◽  
Multiwalled Carbon Nanotubes ◽  
Covalent Attachment ◽  
Fourth Generation ◽  
Layer By Layer ◽  
Multiwalled Carbon

An electrochemical sensor for the detection of paracetamol (PAT) was reported employing multiwalled carbon nanotubes (MWCNTs) and the fourth generation poly(amidoamine) dendrimers (G4.0 PAMAM).

scholarly journals First Electrochemical Sensor (Screen-Printed Carbon Electrode Modified with Carboxyl Functionalized Multiwalled Carbon Nanotubes) for Ultratrace Determination of Diclofenac

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 781 ◽  
Author(s):  
Agnieszka Sasal ◽  
Katarzyna Tyszczuk-Rotko ◽  
Magdalena Wójciak ◽  
Ireneusz Sowa
Keyword(s):  
Carbon Nanotubes ◽  
Electrochemical Sensor ◽  
Multiwalled Carbon Nanotubes ◽  
Active Surface Area ◽  
Carbon Electrode ◽  
Multiwalled Carbon ◽  
Screen Printed Carbon Electrode ◽  
Functionalized Multiwalled Carbon Nanotubes ◽  
Screen Printed

A simple, sensitive and time-saving differential-pulse adsorptive stripping voltammetric (DPAdSV) procedure using a screen-printed carbon electrode modified with carboxyl functionalized multiwalled carbon nanotubes (SPCE/MWCNTs-COOH) for the determination of diclofenac (DF) is presented. The sensor was characterized using optical profilometry, SEM, and cyclic voltammetry (CV). The use of carboxyl functionalized MWCNTs as a SPCE modifier improved the electron transfer process and the active surface area of sensor. Under optimum conditions, very sensitive results were obtained with a linear range of 0.1–10.0 nmol L−1 and a limit of detection value of 0.028 nmol L−1. The SPCE/MWCNTs-COOH also exhibited satisfactory repeatability, reproducibility, and selectivity towards potential interferences. Moreover, for the first time, the electrochemical sensor allows determining the real concentrations of DF in environmental water samples without sample pretreatment steps.

scholarly journals Electrophoretic Deposition of Layer-by-Layer Unsheathed Carbon Nanotubes—A Step Towards Steerable Surface Roughness and Wettability

Materials ◽  
2020 ◽  
Vol 13 (3) ◽  
pp. 595 ◽  
Author(s):  
Emil Korczeniewski ◽  
Monika Zięba ◽  
Wojciech Zięba ◽  
Anna Kolanowska ◽  
Paulina Bolibok ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Multiwalled Carbon Nanotubes ◽  
Electrophoretic Deposition ◽  
Fiber Surface ◽  
Deposition Process ◽  
Layer By Layer ◽  
Major Step ◽  
Multiwalled Carbon ◽  
Water Contact ◽  
Wide Range

It is well known that carbon nanotube (CNT) oxidation (usually with concentrated HNO3) is a major step before the electrophoretic deposition (EPD). However, the recent discovery of the “onion effect” proves that multiwalled carbon nanotubes are not only oxidized, but a simultaneous unsheathing process occurs. We present the first report concerning the influence of unsheathing on the properties of the thus-formed CNT surface layer. In our study we examine how the process of gradual oxidation/unsheathing of a series of multiwalled carbon nanotubes (MWCNTs) influences the morphology of the surface formed via EPD. Taking a series of well-characterized and gradually oxidized/unsheathing Nanocyl™ MWCNTs and performing EPD on a carbon fiber surface, we analyzed the morphology and wettability of the CNT surfaces. Our results show that the water contact angle could be gradually changed in a wide range (125–163°) and the major property determining its value was the diameter of aggregates formed before the deposition process in the solvent. Based on the obtained results we determined the parameters having a crucial influence on the morphology of created layers. Our results shed new light on the deposition mechanism and enable the preparation of surfaces with steerable roughness and wettability.

Modification of a disposable pencil graphite electrode with multiwalled carbon nanotubes: application to electrochemical determination of diclofenac sodium in some pharmaceutical and biological samples

2016 ◽  
Vol 8 (19) ◽  
pp. 3966-3974 ◽  
Author(s):  
Golnaz Parvizi Fard ◽  
Esmaeel Alipour ◽  
Reza Emam Ali Sabzi
Keyword(s):  
Carbon Nanotubes ◽  
Electrochemical Sensor ◽  
Multiwalled Carbon Nanotubes ◽  
Biological Samples ◽  
Graphite Electrode ◽  
Diclofenac Sodium ◽  
Electrochemical Determination ◽  
Pencil Graphite Electrode ◽  
Multiwalled Carbon

A MWCNTs/PGE was developed as an electrochemical sensor and used for the determination of diclofenac sodium (DIC).

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