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Enhancing the adhesion of graphene to polymer substrates by controlled defect formation

机译：通过受控缺陷形成增强石墨烯与聚合物基材的粘附性

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The mechanical integrity of composite materials depends primarily on the interface strength and the defect density of the reinforcement which is the provider of enhanced strength and stiffness. In the case of graphene/polymer nanocomposites which are characterized by an extremely large interface region, any defects in the inclusion (such as folds, cracks, holes, etc) will have a detrimental effect to the internal strain distribution and the resulting mechanical performance. This conventional wisdom, however, can be challenged if the defect size is reduced beyond the critical size for crack formation to the level of atomic vacancies. In that case, there should be no practical effect on crack propagation and depending on the nature of the vacancies the interface strength may in fact increase. In this work we employed argon ion (Ar+) bombardment and subsequent exposure to hydrogen (H-2) to induce (as revealed by x-ray and ultraviolet photoelectron spectroscopy and Raman spectroscopy) passivated atomic single vacancies to CVD graphene. The modified graphene was subsequently transferred to PMMA bars and the morphology, wettability and the interface adhesion of the CVD graphene/PMMA system were investigated with atomic force microscopy technique and Raman analysis. The results obtained showed clearly an overall improved mechanical behavior of graphene/polymer interface, since an increase as well as a more uniform shift distribution with strain is observed. This paves the way for interface engineering in graphene/polymer systems which, in pristine condition, suffer from premature graphene slippage and subsequent failure.
机译：复合材料的机械完整性主要取决于界面强度和增强件的缺陷密度，这是增强强度和刚度的供应商。在石墨烯/聚合物纳米复合材料的情况下，其特征在于极大的界面区域，夹杂物（例如折叠，裂缝，孔等）的任何缺陷将对内部应变分布和所得的机械性能具有不利影响。然而，如果缺陷尺寸减少超出突出构尺寸以裂缝形成到原子空缺水平，则这种传统智慧可能受到挑战。在这种情况下，对裂缝扩展不应该没有实际影响，具体取决于界面强度的空位的性质可以增加。在这项工作中，我们使用氩离子（AR +）轰炸和随后接触氢气（H-2）诱导（如X射线和紫外线光电子谱和拉曼光谱）钝化原子单个空位到CVD石墨烯。随后将改性的石墨烯转移到PMMA条和CVD石墨烯/ PMMA系统的形态，润湿性和界面粘附，用原子力显微镜技术和拉曼分析研究。得到的结果表明，石墨烯/聚合物界面的总体改善的机械性能，因为增加了与菌株的更均匀的换档分布。这为石墨烯/聚合物系统中的界面工程铺平了道路，这些方法在原始状态下，患有过早的石墨烯可滑动和随后的失效。

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