# Effects of Microwave Irradiation on Multiwalled Carbon Nanotubes of Different Diameters

## TL;DR

This study investigates how microwave irradiation affects multi-walled carbon nanotubes of different diameters, revealing emission characteristics and potential applications in lighting technologies without damaging the nanotubes.

## Contribution

It provides new insights into the emission behavior of multi-walled carbon nanotubes under microwave exposure and their stability, highlighting their potential for lighting applications.

## Key findings

- Larger diameter nanotubes emit more intense radiation.
- Microwave irradiation does not increase defect density.
- Emission persists over multiple irradiation cycles.

## Abstract

We have studied the visible and infrared radiation emitted by multi-walled carbon nano-tubes of different diameters when exposed to 2.45 GHz microwaves. A comparison of the spectra suggests that multi-walled carbon nano-tubes with larger diameters emit radiation of greater intensity than those with smaller diameters. Furthermore, the multi-walled carbon nano-tubes continued to emit visible and infrared radiation over the course of several microwave-irradiation cycles, with no degradation in the intensity of the emitted radiation. A comparison of Raman D- to G-band peak-intensity ratios revealed that microwave-irradiation did not significantly impact the multi-walled carbon nano-tubes' defect densities. The results of our experiments suggest that multi-walled carbon nano-tubes may have the potential for use in lighting technologies, and that ohmic heating caused by the polarization of the multi-walled carbon nano-tubes in the microwave field is likely responsible for the observed emissions of visible and infrared radiation.

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Source: https://tomesphere.com/paper/1907.06322