CNTs can act as mettalic as well as semiconducting and I beleive that it can be controlled through band gap.
Dear Dr.
I send you a thesis that you may benefit from with your topic
so many thanks for your recomendations, I will read both the documents.
see the following link for more information
A novel micro-mesostructured SiO2/reduced graphene oxide (RGO) nanocomposite was successfully synthesized by means of simple one-step hydrothermal method under acidic conditions using tetraethoxysilane (TEOS) and graphene oxide (GO) as the raw material. The nanocomposites were characterized by TEM, XRD, FT-IR, TG-DSC, and N2 adsorption-desorption. The results showed that GO was partially reduced to RGO without adding any reducing agent and SiO2 nanoparticles (ca. 10 nm) were uniformly anchored on the surface of RGO. The optimized composite contained 75 wt.% SiO2 and possessed a hierarchical micro-mesoporous structure with a surface area of 676 m2/g. The adsorption performance of synthesized SiO2/RGO samples was investigated by the removal efficiency of Cr(VI) ions in wastewater. The Cr(VI) adsorption reached equilibrium in 30 min and 98.8% Cr(VI) adsorption efficiency was achieved at pH = 2 at 35°C. Stability tests showed that SiO2 nanoparticles effectively prevented RGO from the restacking. The mechanisms of composite formation and for Cr(VI) adsorption were suggested.
https://www.hindawi.com/journals/jnm/2017/6286549/
see the following link for more information https://www.chemistryviews.org/details/ezine/10618642/Bandgap_Tuning_in_Carbon_Nanotubes.html
Bandgap opening and modulating are critical in dictating the functionalities of single-walled carbon nanotubes (SWCNTs) in a broad array of nano-devices. Using first-principles density functional theory calculations, a class of semiconducting armchair SWCNTs with a distinctive BN line defect are studied, showing a super capacity to open the bandgap of (4, 4) SWCNT to as large as 0.86 eV, while the opened bandgap are found decreasing with the increasing diameters of SWCNTs. The opened bandgap of SWCNTs can also be successfully modulated through both mechanical and electrical approaches by applying compressive uniaxial strain and electric field.
@Bhagat sir, Thanks for a comprehensive answer, can we change the bang gap by any chemical process too?
Minot, E. D., Yuval Yaish, Vera Sazonova, Ji-Yong Park, Markus Brink, and Paul L. McEuen. "Tuning carbon nanotube band gaps with strain." Physical review letters 90, no. 15 (2003): 156401.
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