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Recent Patents on Nanotechnology

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ISSN (Print): 1872-2105
ISSN (Online): 2212-4020

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Research Article

A Comparison of Different Methods of MWCNTs Metalation in a Single Step Using Three Different Silver-containing Compounds

Author(s): Beatriz O. García, Oxana V. Kharissova, Rasika Dias, Francisco S. Aguirre-Tostado, César Leyva, Lucy T. González and Boris I. Kharisov*

Volume 13, Issue 1, 2019

Page: [59 - 69] Pages: 11

DOI: 10.2174/1872210513666190225095537

Price: $65

Abstract

Background: Synthesis and applications of Ag-coated carbon nanotubes are currently under intensive research, resulting in a series of recent patents. Silver nanoparticles are normally obtained from silver nitrate. However, there are also other silver-containing compounds that can facilitate the production of silver nanoparticles, such as silver(I) acetate and silver(II) oxide. Being combined with carbon nanotubes, silver nanoparticles can transfer to them some of their useful properties, such as conductivity and antibacterial properties, and contribute to improving their dispersion in solvents.

Objective: To apply three different silver-containing precursors of Ag nanoparticles for the decoration of carbon nanotubes and study the morphology of formed composites by several methods.

Method: Three different silver compounds were used as Ag source to carry out the functionalization and decoration of carbon nanotubes under ultrasonic treatment of the reaction system, containing, commercial carbon nanotubes, organic peroxides as oxidants or hydrazine as a reductant, and a surfactant. Resulting samples were analyzed by XRD and XPS spectroscopy, as well as TEM and SEM microscopy to study the morphology of formed nanocomposites.

Results: Silver nanoparticles can be produced without the presence of a reducing agent. Applying hydrazine, as a reducing agent, it is possible to obtain functionalized carbon nanotubes doped with silver nanoparticles, in which their sizes are smaller (1-5 nm) compared to those obtained without using hydrazine.

Conclusion: Silver nanoparticles having a size range between 2-60 nm can be produced without the presence of a reducing agent. The use of a reducing agent, such as hydrazine, affects the size of silver nanoparticles.

Keywords: Carbon nanotubes, silver, decoration, hydrazine, TEM, SEM.

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