Study of radiative heat transfer in Ångstrom- and nanometre-sized gaps
Study of radiative heat transfer in Ångstrom- and nanometre-sized gaps
复制标题
DOI：
10.1038/ncomms14479
复制
发表时间：
2017-02-15
影响因子：
16.6
通讯作者：
Reddy, Pramod
中科院分区：
文献类型：
--
作者：
Cui, Longji;Jeong, Wonho;Reddy, Pramod
在埃和纳米尺寸的间隙中的辐射热传递是非常感兴趣的，因为它的技术重要性和关于在该制度中的能量传递的物理学的公开问题。在这里，我们报告的辐射热传递的研究在几埃5 nm的间隙尺寸，在真空条件下进行的Au涂层的探针之间的嵌入式纳米级热电偶和加热的平面Au基板，都受到各种表面清洁程序。通过绘制上的明显的隧道势垒高度作为清洁度的签名，我们发现，通过等离子体系统清洗或局部推动尖端到基板上的几个纳米，观察到的辐射电导从意想不到的大值下降到非常小的低于我们的探测器的检测限，正如我们的计算结果所预期的。我们的研究结果表明，它是可能的，以避免表面污染的混杂效应，并系统地研究在埃-和纳米尺寸的间隙中的热辐射。
Radiative heat transfer in angstrom ngstrom- and nanometre-sized gaps is of great interest because of both its technological importance and open questions regarding the physics of energy transfer in this regime. Here we report studies of radiative heat transfer in few angstrom 5nm gap sizes, performed under ultrahigh vacuum conditions between a Au-coated probe featuring embedded nanoscale thermocouples and a heated planar Au substrate that were both subjected to various surface-cleaning procedures. By drawing on the apparent tunnelling barrier height as a signature of cleanliness, we found that upon systematically cleaning via a plasma or locally pushing the tip into the substrate by a few nanometres, the observed radiative conductances decreased from unexpectedly large values to extremely small ones-below the detection limit of our probe-as expected from our computational results. Our results show that it is possible to avoid the confounding effects of surface contamination and systematically study thermal radiation in angstrom ngstrom- and nanometre-sized gaps.