Optical properties of 4 A single-walled carbon nanotubes inside the zeolite channels studied from first principles calculations

TL;DR

This study uses first-principles calculations to explore how embedding 4 Å single-walled carbon nanotubes in zeolite channels alters their structural, electronic, and optical properties, highlighting significant effects due to confinement and interaction.

Contribution

It provides the first detailed theoretical analysis of the structural and optical modifications of SWNTs confined within zeolite channels, emphasizing the influence of the zeolite environment.

Findings

Relaxed geometries differ significantly from isolated SWNTs.

All three types of 4 Å SWNTs can exist inside zeolite channels.

Zeolite affects the electronic structure and optical properties of the (5,0) SWNT.

Abstract

The structural, electronic, and optical properties of 4 A single-walled carbon nanotubes (SWNTs) contained inside the zeolite channels have been studied based upon the density-functional theory in the local-density approximation (LDA). Our calculated results indicate that the relaxed geometrical structures for the smallest SWNTs in the zeolite channels are much different from those of the ideal isolated SWNTs, producing a great effect on their physical properties. It is found that all three kinds of 4 A SWNTs can possibly exist inside the Zeolite channels. Especially, as an example, we have also studied the coupling effect between the ALPO_4-5 zeolite and the tube (5,0) inside it, and found that the zeolite has real effects on the electronic structure and optical properties of the inside (5,0) tube.