期刊
NATURE
卷 572, 期 7771, 页码 628-+出版社
NATURE PORTFOLIO
DOI: 10.1038/s41586-019-1420-z
关键词
-
资金
- US Office of Naval Research [N00014-16-1-2672]
- US Department of Energy [DE-SC0004871]
- US National Science Foundation [1803983]
- National Research Foundation (NRF) - Korean Government [2016R1A5A1012966]
- Collaborative Research Center of the German Research Foundation (DFG) [(SFB) 767]
- U.S. Department of Energy (DOE) [DE-SC0004871] Funding Source: U.S. Department of Energy (DOE)
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [1803983] Funding Source: National Science Foundation
Single-molecule junctions have been extensively used to probe properties as diverse as electrical conduction(1-3), light emission(4), thermoelectric energy conversion(5,6), quantum interference(7,8), heat dissipation( 9,10) and electronic noise(11) at atomic and molecular scales. However, a key quantity of current interest-the thermal conductance of single-molecule junctions-has not yet been directly experimentally determined, owing to the challenge of detecting minute heat currents at the picowatt level. Here we show that picowatt-resolution scanning probes previously developed to study the thermal conductance of single-metal-atom junctions(12), when used in conjunction with a time-averaging measurement scheme to increase the signal-to-noise ratio, also allow quantification of the much lower thermal conductance of single-molecule junctions. Our experiments on prototypical Au-alkanedithiol-Au junctions containing two to ten carbon atoms 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 conductance(13-16) have remained experimentally inaccessible.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据