An electrochemical and magnetic approach for /H2SO4/HNO3/chitosan functionalized multi-wall carbon nanotubes stable solutions

• Published in: Journal of materials science. Materials in electronics Vol. 33; no. 27; pp. 21409 - 21424
• Main Authors: Holanda, E. B. N., Cabral, R. L. B., Ladchumananandasivam, R., Neto, N. F. A., Santos, J. E. L., Santos, E. V., Galvão, F. M. F., Bohn, F., Nascimento, J. H. O.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01-09-2022; Springer Nature B.V
• Subjects: Aqueous solutions; Carbon; Characterization and Evaluation of Materials; Chemistry and Materials Science; Chitosan; Diffraction patterns; Electrolytic analysis; Electrons; Functional groups; High resolution electron microscopy; Interlayers; Magnetic properties; Materials Science; Multi wall carbon nanotubes; Multilayers; Optical and Electronic Materials; Photoelectrons; Raman spectroscopy; Spectrum analysis; Sulfuric acid; Thermodynamic properties; Thermogravimetric analysis; X ray photoelectron spectroscopy
• ISSN: 0957-4522; 1573-482X
• DOI: 10.1007/s10854-022-08933-z

The aim of the research was to evaluate the effects of sulfonitric and CS (CS) treatment in multilayer carbon nanotubes (MWCNT) on their electrochemical and magnetic properties. Thermogravimetric analysis (TG) showed an increase in thermal properties for CS functionalized MWCNT when compared in sulfonitric medium. High resolution transmission electron microscopy (HRTEM) images revealed a reduction in the average diameter of functionalized MWCNT in the presence of CS in addition to decreasing their interlayer spaces. As evidenced by X-ray Diffraction (XRD) patterns. In addition, X-ray photoelectron spectroscopy (XPS) spectra proved the functional groups inclusion of CS and sulfonitric solution on the (carbon nanotubes) CNT matrix. Unlike pristine MWCNT solutions which are unstable in aqueous media, functionalization with acidic solutions and contributed to its potential stabilization. The results obtained by Raman Spectroscopy prove the functionalization through the insertion of functional groups in the walls of the nanotubes. The electroanalysis showed higher capacitance values by mass and by area for samples functionalized with acids and that the addition of CS during functionalization increases the resistance to current flow, causing an insulating effect.