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首页> 外文期刊>Review of Scientific Instruments >Scanning tunneling microscope-quartz crystal microbalance study of temperature gradients at an asperity contact
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Scanning tunneling microscope-quartz crystal microbalance study of temperature gradients at an asperity contact

机译：扫描隧道显微镜-石英晶体微天平研究粗糙接触下的温度梯度

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摘要

Investigations of atomic-scale friction frequently involve setups where a tip and substrate are initially at different temperatures. The temperature of the sliding interface upon contact has thus become a topic of interest. A method for detecting initial tip-sample temperature differences at an asperity contact is described, which consists of a scanning tunneling microscope (STM) tip in contact with the surface electrode of a quartz crystal microbalance (QCM). The technique makes use of the fact that a QCM is extremely sensitive to abrupt changes in temperature. In order to demonstrate the technique's capabilities, QCM frequency shifts were recorded for varying initial tip-substrate temperature differences as an STM tip was brought into and out of contact. The results are interpreted within the context of a recent model for thermal heat conduction at an asperity contact, and it is concluded that the transient frequency response is attributable to small changes in temperature close to the region of contact rather than a change in the overall temperature of the QCM itself. For the assumed model parameters, the results moreover reveal substantial temperature discontinuities at the boundary between the tip and the sample, for example, on the order of 10–15 °C for initial temperature differences of 20 °C.
机译：原子级摩擦的研究通常涉及尖端和基底最初处于不同温度的设置。因此，滑动界面在接触时的温度已成为人们关注的话题。描述了一种用于在粗糙接触处检测初始尖端样品温度差的方法，该方法包括与石英微天平（QCM）的表面电极接触的扫描隧道显微镜（STM）尖端。该技术利用了一个事实，即QCM对温度的突然变化极为敏感。为了证明该技术的功能，记录了QCM频移，以使STM笔尖进入和脱离接触时，笔尖与基板之间的初始温差发生变化。在最近的粗糙接触热传导模型的背景下解释了结果，并得出结论，瞬态频率响应归因于靠近接触区域的温度的微小变化，而不是整体温度的变化QCM本身。对于假定的模型参数，结果还表明，在尖端和样品之间的边界处存在较大的温度不连续性，例如，初始温度差为20 C时，温度间断为10–15C。

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