Observation of Quantum Capacitance of individual single walled carbon nanotubes

TL;DR

This paper reports the measurement of quantum capacitance in individual single-walled carbon nanotubes, revealing a smaller-than-expected quantum capacitance indicative of strong electron correlations.

Contribution

First direct measurement of quantum capacitance in individual SWNTs showing evidence of strong electron correlation effects.

Findings

Quantum capacitance is significantly smaller than density of states predictions.

Strong electron correlation effects are implied in SWNTs.

Measurement demonstrates the quantum capacitance behavior at the single-tube level.

Abstract

We report a measurement on quantum capacitance of individual semiconducting and small band gap SWNTs. The observed quantum capacitance is remarkably smaller than that originating from density of states and it implies a strong electron correlation in SWNTs.