Department of Photoelectronic Information Science and Engineering, School of Science, Xi'an Jiaotong University, 710049, People's Republic of China.
Phys Chem Chem Phys. 2019 Jan 21;21(3):1217-1223. doi: 10.1039/c8cp06608f. Epub 2018 Dec 19.
The mechanical exfoliation of graphite using tape is one way to obtain high-quality graphene samples. However, the amount of graphene obtained is negligible due to the unclear exfoliation mechanism. In this paper, we present a stress accumulation-peeling mechanism, which can be applied to measure the adhesion energy of graphite. This mechanism is different from a wriggle or a creep. First, we obtained a simple universal formula to measure the adhesion energy G = (F-F)/3b, where F and F are the maximum and minimum values, respectively, of the external stretch force in the peeling process, and b is the width of the peeling arm. Second, the reliability of the method was demonstrated by measuring the adhesion energy between polydimethylsiloxane and glass. Using the simple universal formula, the adhesion energies of three graphite slices were determined to be 0.34 ± 0.03, 0.33 ± 0.06 and 0.34 ± 0.02 J m. These adhesion energies were consistent with the other measured result of 0.33 J m, which was based on the self-retraction phenomenon of graphite. The macroscopic method is very simple and easy to implement. It can be used to measure the adhesion energy of any van der Waals material and any biomaterial with adhesion interaction, as well as prepare excellent 2D material samples by optimizing the experimental conditions.
使用胶带对石墨进行机械剥离是获得高质量石墨烯样品的一种方法。然而，由于剥离机制不清楚，获得的石墨烯数量可以忽略不计。在本文中，我们提出了一种应力积累-剥离机制，可以用来测量石墨的粘附能。这种机制与蠕动或蠕动不同。首先，我们得到了一个简单的通用公式来测量粘附能 G = (F-F)/3b，其中 F 和 F 分别是剥离过程中外力的最大值和最小值，b 是剥离臂的宽度。其次，通过测量聚二甲基硅氧烷和玻璃之间的粘附能来验证该方法的可靠性。使用简单的通用公式，确定了三片石墨的粘附能分别为 0.34±0.03、0.33±0.06 和 0.34±0.02 J m。这些粘附能与基于石墨自回缩现象得出的另一个测量结果 0.33 J m 一致。宏观方法非常简单，易于实施。它可以用于测量任何范德华材料和具有粘附相互作用的任何生物材料的粘附能，并通过优化实验条件来制备优秀的二维材料样品。
