# Probing the role of carbon solubility in transition metal catalyzing Single-Walled Carbon Nanotubes growth

## TL;DR

This study investigates how varying carbon solubility in transition metal catalysts influences the growth mechanisms of single-walled carbon nanotubes, highlighting the importance of solubility tuning for sustainable growth.

## Contribution

The paper introduces a physical model isolating carbon solubility effects in Ni-C alloys, providing new insights into nanotube growth mechanisms.

## Key findings

- Carbon solubility is crucial for continuous nanotube growth.
- Models show solubility tuning prevents catalyst encapsulation.
- Sustainable growth depends on optimal carbon incorporation.

## Abstract

Metal catalysts supporting the growth of Single Wall Carbon Nanotubes display different carbon solubilities and chemical reactivities. In order to specifically assess the role of carbon solubility, we take advantage of the physical transparency of a tight binding model established for Ni-C alloys, to develop metal carbon models where all properties, except carbon solubility, are similar. These models are used to analyze carbon incorporation mechanisms, modifications of metal / carbon wall interfacial properties induced thereby, and the associated nanotube growth mechanisms. Fine tuning carbon solubility is shown to be essential to support sustainable growth, preventing growth termination by either nanoparticle encapsulation or detachment.