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13. Sensing Materials: Graphene

Author

Nossol, Edson, primary, Muñoz, Rodrigo Alejandro Abarza, additional, Richter, Eduardo Mathias, additional, de Souza Borges, Pedro Henrique, additional, Silva, Samuel Carlos, additional, and Rocha, Diego Pessoa, additional

Published
2023
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22. 3D-printed electrodes using graphite/carbon nitride/polylactic acid composite material: A greener platform for detection of amaranth dye in food samples

Author

de Faria, Lucas V., primary, Villafuerte, Luana M., additional, do Nascimento, Suéllen F.L., additional, de Sá, Igor C., additional, Peixoto, Diego A., additional, Ribeiro, Ruan S. de A., additional, Nossol, Edson, additional, Lima, Thiago de M., additional, Semaan, Felipe S., additional, Pacheco, Wagner F., additional, and Dornellas, Rafael M., additional

Published
2024
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30. Carbon black/acrylonitrile‐butadiene‐styrene composite material incorporated with silver nanoparticles: A new sensitive and cost‐effective electrochemical platform for trace lead detection in seawater samples

Author

do Nascimento, Suéllen F. L., primary, de Faria, Lucas V., additional, da S. Cabral, Taíssa, additional, P. Lisboa, Thalles, additional, de S. Borges, Pedro H., additional, Nossol, Edson, additional, S. Semaan, Felipe, additional, Dornellas, Rafael M., additional, and Pacheco, Wagner F., additional

Published
2023
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41. Carbon black/acrylonitrile‐butadiene‐styrene composite material incorporated with silver nanoparticles: A new sensitive and cost‐effective electrochemical platform for trace lead detection in seawater samples.

Author

do Nascimento, Suéllen F. L., de Faria, Lucas V., da S. Cabral, Taíssa, P. Lisboa, Thalles, de S. Borges, Pedro H., Nossol, Edson, S. Semaan, Felipe, Dornellas, Rafael M., and Pacheco, Wagner F.

Subjects
ACRYLONITRILE butadiene styrene resins, COMPOSITE materials, SILVER nanoparticles, CARBON composites, LEAD, ATOMIC absorption spectroscopy
Abstract

A novel composite material based on acrylonitrile‐butadiene‐styrene (ABS) and carbon black (CB) was proposed here. Different ratios between CB and ABS (40 : 60–60 : 40 %, w/w) were studied to obtain a substrate with improved electrochemical properties. These materials were characterized by techniques such as cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), Raman and Fourier transform infrared (FT‐IR) spectroscopies and scanning electron microscopy (SEM). Under the CB/ABS substrate (50 : 50 %, w/w), a lower charge transfer resistance (854 Ω) and a higher heterogeneous electron transfer constant (K0=1.551×10−3 cm s−1) were found, indicating a kinetically more favorable reaction. To improve the electroanalytical performance of the CB/ABS electrode (50 : 50 %, w/w), silver nanoparticles (AgNPs) were electrodeposited using recycled silver from photographic waste, whose presence was confirmed by SEM imaging and Raman spectra. A method using square wave anodic stripping voltammetry (SWASV) and Pb2+ as model species was developed, where a wider linear working range (4.0 to 40.0 μg L−1) and lower detection limit (0.4 μg L−1) were achieved for the modified electrode. The electrode modification process was highly reproducible (RSD=9.7 %, n=9, inter‐electrode), with precise electrochemical responses (RSD=3.6 %, n=9, intra‐electrode). The applicability was demonstrated in two seawater samples, where recovery levels between 94 and 106 %, as well as statistically similar results to those obtained by atomic absorption spectroscopy, attested to the reliability of the analysis. Furthermore, it is noteworthy that an appropriate selectivity was achieved even in the presence of other metallic species. The proposed composite material is low‐cost, robust, versatile, and can be a promising tool for additive manufacturing of electrochemical sensors. [ABSTRACT FROM AUTHOR]

Published
2024
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44. CO2-plasma surface treatment of graphite sheet electrodes for detection of chloramphenicol, ciprofloxacin and sulphanilamide.

Author

Pereira, Jian F. S., Di-Oliveira, Marina, Faria, Lucas V., Borges, Pedro H. S., Nossol, Edson, Gelamo, Rogério V., Richter, Eduardo M., Lopes, Osmando F., and Muñoz, Rodrigo A. A.

Subjects
CIPROFLOXACIN, SURFACE preparation, SULFANILAMIDES, CHLORAMPHENICOL, ELECTROCHEMICAL electrodes, ELECTRODES
Abstract

Graphite sheet (GS) electrodes are flexible and versatile substrates for sensing electrochemical; however, their use has been limited to incorporate (bio)chemical modifiers. Herein, we demonstrated that a cold (low temperature) CO2 plasma treatment of GS electrodes provides a substantial improvement of the electrochemical activity of these electrodes due to the increased structural defects on the GS surface as revealed by Raman spectroscopy (ID/IG ratio), and scanning electron microscopy images. XPS analyses confirmed the formation of oxygenated functional groups at the GS surface after the plasma treatment that are intrinsically related to the substantial increase in the electron transfer coefficient (K0 values increased from 1.46 × 10−6 to 2.09 × 10−3 cm s−1) and with reduction of the resistance to charge transfer (from 129.8 to 0.251 kΩ). The improved electrochemical activity of CO2-GS electrodes was checked for the detection of emerging contaminant species, such as chloramphenicol (CHL), ciprofloxacin (CIP) and sulphanilamide (SUL) antibiotics, at around + 0.15, + 1.10 and + 0.85 V (versus Ag/AgCl), respectively, by square wave voltammetry. Limit of detection values in the submicromolar range were achieved for CHL (0.08 μmol L−1), CIP (0.01 μmol L−1) and SFL (0.11 μmol L−1), which enabled the sensor to be successfully applied to natural waters and urine samples (recovery values from 85 to 119%). The CO2-GS electrode is highly stable and inexpensive ($0.09 each sensor) and can be easily inserted in portable 3D printed cells for environmental on-site analyses. [ABSTRACT FROM AUTHOR]

Published
2023
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50. Nickel Oxy-Hydroxy/Multi-Wall Carbon Nanotubes Film Coupled with a 3D-Printed Device as a Nonenzymatic Glucose Sensor.

Author

Silva, Murillo N. T., Rocha, Raquel G., Richter, Eduardo M., Munoz, Rodrigo A. A., and Nossol, Edson

Subjects
CARBON nanotubes, CARBON films, NICKEL films, NICKEL, LIQUID-liquid interfaces, GLUCOSE
Abstract

A rapid and simple method for the amperometric determination of glucose using a nanocomposite film of nickel oxyhydroxide and multi-walled carbon nanotube (MWCNTs) was evaluated. The NiHCF)/MWCNT electrode film was fabricated using the liquid–liquid interface method, and it was used as a precursor for the electrochemical synthesis of nickel oxy-hydroxy (Ni(OH)2/NiOOH/MWCNT). The interaction between nickel oxy-hydroxy and the MWCNTs provided a film that is stable over the electrode surface, with high surface area and excellent conductivity. The nanocomposite presented an excellent electrocatalytic activity for the oxidation of glucose in an alkaline medium. The sensitivity of the sensor was found to be 0.0561 μA μmol L−1, and a linear range from 0.1 to 150 μmol L−1 was obtained, with a good limit of detection (0.030 μmol L−1). The electrode exhibits a fast response (150 injections h−1) and a sensitive catalytic performance, which may be due to the high conductivity of MWCNT and the increased active surface area of the electrode. Additionally, a minimal difference in the slopes for ascending (0.0561 µA µmol L−1) and descending (0.0531 µA µmol L−1) was observed. Moreover, the sensor was applied to the detection of glucose in artificial plasma blood samples, achieving values of 89 to 98% of recovery. [ABSTRACT FROM AUTHOR]

Published
2023
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