This is an unedited manuscript that has been accepted for publication. Nature Research are providing this early version of the manuscript as a service to our customers. The manuscript will undergo copyediting, typesetting and a proof review before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers apply.

Thermal conductance of single-molecule junctions

Abstract

Single-molecule junctions have been extensively used to probe properties as diverse as electrical conduction1–3, light emission4, thermoelectric energy conversion5,6, quantum interference7,8, heat dissipation9,10 and electronic noise11 at atomic and molecular scales. But a quantity of considerable current interest—the thermal conductance of a single-molecule junction—has eluded direct experimental determination, reflecting the considerable challenge of detecting minute heat currents at the picowatt level. Here we show that, when used in conjunction with a time-averaging measurement scheme to increase the signal-to-noise ratio, the custom-developed probes that enabled thermal conductance measurements of single-metal-atom junctions12 can also quantify the much lower thermal conductance of single-molecule junctions. Our experiments on prototypical Au–alkanedithiol–Au junctions, where the number of carbon atoms was varied from two to ten, confirm that thermal conductance is to a first approximation independent of molecular length, consistent with detailed ab initio simulations. We anticipate that our approach will enable systematic exploration of thermal transport in many other one-dimensional systems, such as short molecules and polymer chains, for which computational predictions of thermal conductance13–16 have remained experimentally inaccessible.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.

from$8.99

All prices are NET prices.

Author information

Correspondence to Fabian Pauly or Sung-Yeon Jang or Pramod Reddy or Edgar Meyhofer.

Rights and permissions

Reprints and Permissions

About this article

Verify currency and authenticity via CrossMark

Further reading

Comments

By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.