Optoelectronic Characterization and Properties of Single-walled Carbon Nanotubes in a Liquid Dispersion Form

Carbon nanotubes (CNTs) are very promising nanodevices due to their extraordinary electrical, thermal, and optical properties. However, as-grown single-walled CNTs (SWCNTs) contain a mixture of semiconducting and metallic species with great features versatility and variation. Solution-based processi...

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Bibliographic Details
Published inInternational Journal of Technology Vol. 14; no. 1; pp. 65 - 77
Main Authors S. Alabsi, Sami, Khir, Mohd Haris Md, Dennis, John Ojur, Hashwan, Saeed S. Ba, Algamili, Abdullah S.
Format Journal Article
LanguageEnglish
Published Universitas Indonesia 2023
Subjects
carbon nanotubes
dispersion
optoelectronic properties
separation
spectroscopy
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Summary:Carbon nanotubes (CNTs) are very promising nanodevices due to their extraordinary electrical, thermal, and optical properties. However, as-grown single-walled CNTs (SWCNTs) contain a mixture of semiconducting and metallic species with great features versatility and variation. Solution-based processing of this nanomaterial is vital for further implementation in applicable platforms. In this paper, important optoelectronic intrinsic properties of SWCNTs in dispersions are studied applying a semi-empirical approach of optical characterization and Tauc/Davis-Mott relation and Max-Planck equations. SWCNTs are found to have a direct bandgap of 2.20 eV, an indirect bandgap of 0.27 eV, an optical conductivity of about 107 S cm-1, and exhibited a metamaterial behavior ascribed to the high negative permittivity. In addition, the optimum parameters for the dispersion of SWCNTs, and the separation of the semiconducting species using simple mechanical methods of ultrasonication and density gradient ultracentrifugation, respectively, without using surfactants are also presented.
ISSN:2086-9614
2087-2100
DOI:10.14716/ijtech.v14i1.5124