Electrochemical biosensing of galactose based on carbon materials: graphene versus multi-walled carbon nanotubes

Nano carbons, such as graphene and carbon nanotubes, show very interesting electrochemical properties and are becoming a focus of interest in many areas, including electrodeposition of carbon–metal composites for battery application. The aim of this study was to incorporate carbon materials (namely oxidized multi-walled carbon nanotubes (ox-MWCNT), pristine multi-walled carbon nanotubes (P-MWCNT), and reduced graphene oxide (rGO)) into a metallic tin matrix. Formation of the carbon–tin composite materials was achieved by electrodeposition from a choline chloride-based ionic solvent. The different structures and treatments of the carbon materials will create metallic composites with different characteristics. The electrochemical characterization of Sn and Sn composites was performed using chronoamperometry, potentiometry, electrochemical impedance, and cyclic voltammetry. The initial growth stages of Sn and Sn composites were characterized by a glassy-carbon (GC) electrode surface. Nucleation studies were carried out, and the effect of the carbon materials was characterized using the Scharifker and Hills (SH) and Scharifker and Mostany (SM) models. Through a non-linear fitting method, it was shown that the nucleation of Sn and Sn composites on a GC surface occurred through a 3D instantaneous process with growth controlled by diffusion. According to Raman and XRD analysis, carbon materials were successfully incorporated at the Sn matrix. AFM and SEM images showed that the carbon incorporation influences the coverage of the surface as well as the size and shape of the agglomerate. From the analysis of the corrosion tests, it is possible to say that Sn-composite films exhibit a comparable or slightly better corrosion performance as compared to pure Sn films.

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Biosensors for Food Toxin Detection: Carbon Nanotubes and Graphene

MRS Proceedings ◽

10.1557/opl.2015.165 ◽

2015 ◽

Vol 1725 ◽

Cited By ~ 7

Author(s):

Bansi D. Malhotra ◽

Saurabh Srivastava ◽

Shine Augustine

Keyword(s):

Carbon Nanotubes ◽

Early Detection ◽

Electrochemical Properties ◽

Carbon Materials ◽

Electrochemical Biosensor ◽

Food Contamination ◽

Multi Walled Carbon Nanotubes ◽

Carbon Based Nanomaterials ◽

Food Toxin ◽

Walled Carbon Nanotubes

ABSTRACTThere is increased interest towards the application of carbon based nanomaterials to biosensors since these can be used to quickly detect presence of the toxins in food, agricultural and environmental systems. The accurate, faster and early detection of food toxins is presently very important for ensuring safety and shelf life of agricultural commodities resulting from food contamination. The carbon materials (CNTs) and recently discovered graphene have been predicted to be promising candidates in the development of electrochemical biosensor owing to their exceptionally large surface area and interesting electrochemical properties. We focus on some of the recent results obtained in our laboratories pertaining to the development of biosensors based on multi-walled carbon nanotubes and graphene for mycotoxin(aflatoxin ) detection.

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Polycondensation of Hexamethylenetetramine in Anhydrous Acid Media as a New Approach to Carbyne-Like Materials and Its Application as Dispersant of Carbon Materials

C – Journal of Carbon Research ◽

10.3390/c5030054 ◽

2019 ◽

Vol 5 (3) ◽

pp. 54

Author(s):

Alyona V. Gerasimova ◽

Olga V. Alekhina ◽

Leticia García-Cruz ◽

Jesús Iniesta ◽

Alexander V. Melezhik ◽

...

Keyword(s):

Carbon Nanotubes ◽

Photoelectron Spectroscopy ◽

Spectral Properties ◽

High Performance ◽

Carbon Materials ◽

Acid Media ◽

New Approach ◽

X Ray ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

Aminocumulene (AC), a technical name that results from the hexamethylenetetramine polycondensation in anhydrous sulfuric acid, was successfully performed toward the synthesis of oligomeric cumulenic compounds made up of carbyne-like (=C=C)x fragments as a main moiety together with amino endcapping groups. The tentative mechanism for the synthesis of the soluble and insoluble AC likely included the participation of carbene species as an intermediate. Spectral properties obtained from UV-Vis, infrared, and Raman spectroscopies, and surface chemistry analysis through X-ray photoelectron spectroscopy of the soluble AC confirmed the presence of a mixture of linear and branched aminocumulene-based oligomers. AC displayed high performance as a dispersant and stabilizer agent of both multi-walled carbon nanotubes and graphene in aqueous solutions after powerful insonation treatment under controlled temperature compared to the most commonly used dispersant agents. Thereby, AC is vitally important for the preparation of carbonaceous materials based on nanoinks in a wide variety of fields.

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Conductivity Modification of Carbon-Based Nanocomposites

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.879.41 ◽

2018 ◽

Vol 879 ◽

pp. 41-46

Author(s):

Theerapol Thurakitseree ◽

Wilaiwan Leenakul

Keyword(s):

Carbon Nanotubes ◽

Electron Transfer ◽

Thermal Properties ◽

Polyvinyl Chloride ◽

Chemical Process ◽

Carbon Materials ◽

Electrical Conductivities ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes ◽

Thermal Conductivities

The combination of carbon materials and polymer has been well studied according to their compatable mixture in polymer with promising properties. Due to their excellent electrical and thermal properties for some types of carbons such as carbon nanotubes and graphite, they have been selected as component for nanocomposites. Here, capability of multi-walled carbon nanotubes (MWNTs) and graphite for nanocomposites were demonstrated. Nanotubes were functionalized by chemical process, and added into polyvinyl chloride (PVA) matrix. They were then used as main filler to modify thermal and electrical conductivities. Conductivities of different composite mixtures were finally investigated. With the use of low total amount of carbon materials, it was found that although there is no significant change in electrical and thermal conductivities, the highest conductivities could be obtained from MWNT to graphite ratio of 1:1 in PVA matrix, while the G-band mode does not give a rise to electron transfer.

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The kinetic and thermodynamic analysis of Li+ in multi-walled carbon nanotubes

MRS Proceedings ◽

10.1557/proc-835-k6.8 ◽

2004 ◽

Vol 835 ◽

Author(s):

Kezhi Lin ◽

Yanhui Xu ◽

Xiaolin Wang

Keyword(s):

Carbon Nanotubes ◽

Diffusion Coefficient ◽

Carbon Materials ◽

Reversible Capacity ◽

Electrochemical Intercalation ◽

Different Types ◽

Multi Walled Carbon Nanotubes ◽

Kinetic And Thermodynamic Analysis ◽

Walled Carbon Nanotubes ◽

Electrochemical Intercalation Reaction

AbstractThe multi-walled carbon nanotubes (MWNTs) prepared by CVD were used in electrochemical intercalation reaction with Li+. The results of the first several charge-discharge cycles showed that the reversible capacity of the MWNTs was larger than the theoretical capacity of graphitized carbon. The equivalent circuit of the Li+ intercalated into the MWNTs was simulated The diffusion coefficient calculated based on the results of the impedance was in the range between 1 ∼ 4×10−10 cm2s−1. The diffusion coefficient calculated based on the technique of the chronoamperometery was 3.5×10−10 cm2s−1. The diffusion coefficients of the Li+ reacted with MWNTs was in the range of that of the most carbon materials. Using EMF method the partial molar entropy (ΔSx) and partial molar enthalpy (ΔHx) of the Li+ intercalated into the MWNTs were calculated as a function of × in Lix C6 at different temperatures. The values of ΔSx were in the range of 150 ∼ 550 J mol-1K-1. The values of ΔHx at 35 °C were in the range of 40∼110 kJ mol−1. Both of the ΔSx and ΔHx were lower and the changes were smaller than the values of some other carbonaceous materials. By analyzing the results conclusion is obtained that Li+ exist in MWNTs with different types which include adsorption and intercalation types.

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The design and fabrication of nanoengineered platinum needles with laser welded carbon nanotubes (CNTs) for the electrochemical biosensing of cancer lymph nodes

Biomaterials Science ◽

10.1039/d1bm00875g ◽

2021 ◽

Author(s):

Ashkan Zandi ◽

Zahra Davari Sh. ◽

Fatemeh Shojaeian ◽

S. M. Sadegh Mousavi-kiasary ◽

Fereshteh Abbasvandi ◽

...

Keyword(s):

Carbon Nanotubes ◽

Fatty Acid ◽

Lymph Nodes ◽

Laser Irradiation ◽

Fatty Acid Oxidation ◽

Acid Oxidation ◽

Electrochemical Biosensing ◽

Multi Walled Carbon Nanotubes ◽

Walled Carbon Nanotubes

A new biosensor for detecting cancer lymph nodes was developed based on the electrochemical tracing of fatty acid oxidation. The sensor needles were decorated with superhydrophobic multi-walled carbon nanotubes using laser irradiation nano-welding.

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Adsorption of estrone, 17β-estradiol, and 17α-ethinylestradiol from water onto modified multi-walled carbon nanotubes, carbon cryogel, and carbonized hydrothermal carbon

10.21203/rs.3.rs-447545/v1 ◽

2021 ◽

Author(s):

Danijela Prokic ◽

Marija Vukčević ◽

Angelina Mitrović ◽

Marina Maletić ◽

Ana Kalijadis ◽

...

Keyword(s):

Carbon Nanotubes ◽

Functional Groups ◽

Adsorption Process ◽

Carbon Materials ◽

Textural Properties ◽

Surface Functional Groups ◽

Multi Walled Carbon Nanotubes ◽

Carbon Cryogel ◽

17Β Estradiol ◽

Walled Carbon Nanotubes

Abstract Carbon materials of different structural and textural properties (multi-walled carbon nanotubes, carbon cryogel, and carbonized hydrothermal carbon) were used as adsorbents for the removal of estrone, 17β-estradiol, and 17α-ethinylestradiol from aqueous solutions. Chemical modification and/or activation were applied to alter surface characteristics and to increase the adsorption and desorption efficiency of carbon materials. Surfaces of treated and untreated carbon materials were characterized through the examination of the textural properties, the nature of surface functional groups, and surface acidity. Although specific surface area and content of surface functional groups did not have a dominant influence on the adsorption process, it was found that a high ratio of surface mesoporosity affected the adsorption process most prominently by increasing adsorption capacity and the rate of the adsorption process. High values of adsorption efficiency (88–100 %) and maximum adsorption capacities (29.45–194.7 mg/g) imply that examined materials, especially mesoporous carbon cryogel and multi-walled carbon nanotubes, can be used as powerful adsorbents for relatively fast removal of estrogen hormones from water.

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Flexible hybrid photodetector based on silver sulfide nanoparticles and multi-walled carbon nanotubes

RSC Advances ◽

10.1039/d1ra03385a ◽

2021 ◽

Vol 11 (37) ◽

pp. 22625-22632

Author(s):

Sung Ho Kim ◽

Jieun Lim ◽

Seonjeong Lee ◽

Myung Hyun Kang ◽

Wooseok Song ◽

...

Keyword(s):

Carbon Nanotubes ◽

Carbon Materials ◽

Semiconductor Nanocrystals ◽

Silver Sulfide ◽

Hybrid Nanocomposites ◽

Multi Walled Carbon Nanotubes ◽

Silver Sulfide Nanoparticles ◽

Walled Carbon Nanotubes

In this study, we reported a wearable photodetector based on hybrid nanocomposites, such as carbon materials and biocompatible semiconductor nanocrystals (NCs), exhibiting excellent photoresponsivity and superior durability.

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