基于量子点探针的超低摩擦力高精度定量测量技术

Ultra-slippery with characteristics of low friction coefficient and low wear, is considered to be the fundamental way to reduce energy consumption and wear. It is the key restriction to the development of ultra-slippery that lack of ultra-low friction measurement means and the low measurement accuracy. At present, the principal problem of ultra-low friction detection is how to limit the error source, especially it is difficult to avoid the probe tip friction angle error. In view of the above problems, the project team proposed that utilizing quantum dot sensing technology and the spectral sensing instead of mechanical sensing, to avoid the friction angle caused mechanical error. By using the quantum dot coupled AFM scanning probe as the technology platform, the spectral lateral changes of the quantum dots under different frictional forces are used to characterize the change of the frictional lateral force, and implement the in situ Synchronous dynamic friction measurement of high precision. This provide friction coefficient detection a new detection method. The smooth implementation of this study can play an important role in promoting the development of ultra-slipping, and help to reveal the mechanism of slipping and expanding its application.

超滑拥有摩擦系数低和磨损小的特点，被认为是降低能耗和磨损的根本途径。其中超低摩擦测量手段的缺乏和测量精度不高是制约超滑发展的关键。目前超低摩擦检测的重要问题是检测误差来源多，尤其是探针尖端摩擦倾角带来的误差很难避免。针对上述问题，项目组提出采用量子点传感技术，利用光谱传感代替力学传感，避免了由摩擦倾角带来的力学误差。通过筛选并合成尺寸大小适中的高荧光强度量子点，以量子点耦合AFM扫描探针为技术平台，利用量子点在不同摩擦力作用下的光谱变化表征摩擦侧向力的变化，实现原位、同步、动态的摩擦力高精度的测量，为摩擦系数检测提供一种新的检测方法。该研究的顺利实施对推动超滑发展，揭示超滑产生机理和拓展其应用有重要的帮助和支撑作用。

针对超低摩擦测量精度不高的问题，本项目旨在发展纳米光学增强结构，建立高性能量子点光学传感器降低传统超低摩擦检测技术的检测误差。项目组利用配体辅助再沉淀技术制备了钙钛矿量子点，研究了制备参数、缺陷掺杂等对其发光性能的影响，并结合第一性原理计算验证了量子点能带结构的变化，优化了纳米光学增强结构，获得了可靠的量子点制备和修饰技术，实现了表面吸附有机分子的超灵敏检测；利用自行搭建的反射-荧光光谱成像系统，结合人工智能算法，实现了二维材料的自动检测；利用荧光光谱、荧光寿命成像技术开展了二维材料/量子点界面的能量耗散研究，为摩擦能量耗散机理的研究提供了优异的纳米表征方法，也为超低摩擦提供了一种新的原位、动态的高精度检测途径。