Optimal Matching of Thermal Vibrations into Carbon Nanotubes

TL;DR

This paper presents a theoretical approach to optimize heat transfer into carbon nanotubes by functionalizing their ends, achieving over 90% of maximum heat flux at room temperature through phonon transmission optimization.

Contribution

It introduces a Landauer-based model to optimize phonon transmission into CNTs by functionalizing their ends, a novel theoretical approach for thermal management.

Findings

Over 90% heat flux transfer possible with 1nm intermediate material at 300K

Analytical and numerical calculations of phonon transmission

Optimization of CNT end functionalization for thermal conductivity enhancement

Abstract

Carbon nanotubes (CNTs) are promising candidates to improve the thermal conductivity of nano-composites. The main obstacle to these applications is the extremely high thermal boundary (Kapitza) resistance between the CNTs and their matrix. In this theoretical work our goal is to maximize the heat flux through the CNT by functionalizing the CNT ends. We use a Landauer approach to calculate and optimize the energy flux from a soft to a hard material in one dimension through a connecting continuous medium of varying elasticity and density. The transmission probability of phonons through the system is calculated both numerically and analytically. We find that over 90% of the maximum heat flux into CNT is possible for 1nm length of the intermediate material at room temperature (300K).