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Hamza, B. M., Gacem, A., Yadav, K. K., Obaidullah, A. J., Shahin, R., Mishra, S., ... & Yadav, R. K. (2025). Journal of Photochemistry and Photobiology A: Chemistry, 116517.
The synthesis of the MWCNT-acid fuchsin (AF) composite involves a straightforward procedure designed to enhance the photocatalytic properties of multi-walled carbon nanotubes (MWCNTs) for solar-driven applications. The process begins with the dispersion of 50 mg of MWCNT in 100 mL of N, N'-dimethylformamide (DMF) followed by sonication for 30 minutes to ensure a uniform suspension. Subsequently, 200 mg of acid fuchsin (AF) and 800 mg of dicyclohexyl carbodiimide (DCC) are added to the solution.
The reaction mixture is then kept at 80 °C under an inert atmosphere for 48 hours to allow the coupling reaction between MWCNTs and AF. After completion of the reaction, the mixture is cooled, filtered, and washed thoroughly with water to remove any unreacted materials. The resulting MWCNT@AF composite is then dried overnight at 60 °C.
Characterization techniques such as Fourier-transform infrared (FTIR) spectroscopy, UV-Vis spectroscopy, and electrochemical impedance spectroscopy (EIS) are employed to confirm the successful synthesis of the composite and to investigate its optical and electrochemical properties. This composite is further tested in photocatalytic experiments, demonstrating its capability for NADH regeneration and facilitating organic reactions under solar irradiation.
This simple and efficient synthesis highlights the potential of MWCNT-based composites in enhancing photocatalytic performance for renewable energy and biocatalysis applications.
Ostojić, J., Savić, S., Manojlović, D., Metelka, R., Stanković, V. and Stanković, D., 2025. Diamond and Related Materials, p.112450.
Multi-walled carbon nanotubes (MWCNTs) are increasingly employed to enhance the performance of electrochemical sensors due to their exceptional electrical conductivity, large surface area, and favorable electrocatalytic properties. In this study, MWCNTs were integrated into screen-printed carbon electrodes (MWCNT SPEs) to develop a sensitive and portable platform for the electrochemical detection of caffeine in dietary samples.
The fabrication involved modifying screen-printed electrodes with MWCNTs to increase the effective surface area and electron transfer rate. The MWCNT SPEs demonstrated optimal analytical performance in Britton-Robinson buffer at pH 2, exhibiting a broad linear detection range for caffeine between 33 μM and 500 μM. The method achieved a limit of detection (LOD) of 8.65 μM and a limit of quantification (LOQ) of 26.20 μM, making it suitable for food analysis applications.
Comparative assessments with boron-doped diamond (BDD) electrodes highlighted the advantages of MWCNT-based sensors in terms of ease of preparation and effective performance in acidic media. Electrode stability was confirmed through scanning electron microscopy before and after 100 recording cycles, demonstrating structural integrity and reliability for repeated measurements.
The MWCNT SPEs enabled accurate caffeine quantification in real samples, with validation through high-performance liquid chromatography and spectrophotometry. This work underscores the practical value of MWCNTs in constructing cost-effective, sensitive, and field-deployable electrochemical sensors for food safety monitoring.
Gallay, Pablo A., et al. Journal of Pharmaceutical and Biomedical Analysis Open 5 (2025): 100066.
Multi-walled carbon nanotubes (MWCNTs) were employed in the preparation of a nanohybrid sensor through sono-synthesis with MOF-199, enabling enhanced electrochemical detection of hydrogen peroxide. The synergistic combination of MWCNTs and MOF-199 facilitated catalytic activity via improved electron transfer and regeneration of active sites, significantly enhancing sensitivity and reproducibility.
To fabricate the sensing platform, a dispersion was first prepared by mixing 0.50 mg of MWCNTs with 1.00 mg of MOF-199 in 1.0 mL of 0.1 % v/v Nafion, followed by 30 minutes of sonication. Glassy carbon electrodes (GCEs) were polished sequentially with alumina slurries (1.0, 0.3, and 0.05 μm), rinsed, sonicated briefly, and dried under nitrogen. The modified electrodes (GCE/MWCNT-MOF-199-Nf) were then obtained by drop-casting 20 µL of the prepared dispersion onto the GCE surface and drying at 50 °C.
The resulting sensor exhibited excellent performance in the electrochemical quantification of hydrogen peroxide, showing a linear response between 5.0 × 10⁻⁶ and 7.5 × 10⁻⁵ M, a detection limit of 2 μM, and high reproducibility (8.0%). Real sample testing-including milk, serum, mouthwash, and disinfectant solutions-confirmed the method's applicability.
This study underscores the role of MWCNTs in constructing high-performance electrochemical sensors, particularly in hybrid systems, where their conductivity and surface area contribute critically to enhanced analytical outcomes.
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