Wu Hongyan, Huang Ke, Li Jianliang, Jiang Fan, Zhao Xingming, Wang Lu, Jiang Shan
Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean, School of Physics & Optoelectronic Engineering, Nanjing University of Information Science & Technology Nanjing China
College of Material Science and Technology, Nanjing University of Science and Technology Nanjing China
RSC Adv. 2018 Jan 4;8(3):1436-1442. doi: 10.1039/c7ra09134f. eCollection 2018 Jan 2.
In the present work, a novel method was developed to study the evolving surface state of graphene film as it is subject to friction, characterized by photoluminescence properties. We prepared the graphene film (GF) and YSZ:Er (Er-Y co-doped ZrO)/graphene composite films (ZGCF). The Raman spectra and photoluminescence properties of the GF and ZGCF were characterized before and after the sliding friction. A remarkable phenomenon was observed that after friction the GF generated a more pronounced luminescence response than it had prior, apparently due to graphene quantum dots which were found in the wear debris of the GF. Furthermore, the introduction of graphene into YSZ:Er nanoparticles (NPs) resulted in an unmistakable red-shift on the main luminescence bands of ZGCF after the applied friction. This is explained by the formation of considerable graphene scrolls in the wear debris of ZGCF due to the interaction of the graphene and the YSZ:Er NPs. It can be concluded that changes to the configuration of graphene greatly influence the tribo-induced photoluminescence response. Our findings justify further investigation into the composition and morphology of worn surfaces in order to better understand how photoluminescence relates to frictional effects. In addition, this work proposes the fabrication of graphene quantum dots and nanoscale scrolls as a new potential application of the tribo-induced photoluminescence study.
在本工作中，开发了一种新颖的方法来研究石墨烯薄膜在受到摩擦时其不断演变的表面状态，该方法以光致发光特性为特征。我们制备了石墨烯薄膜（GF）和YSZ:Er（铒 - 钇共掺杂氧化锆）/石墨烯复合薄膜（ZGCF）。在滑动摩擦前后对GF和ZGCF的拉曼光谱和光致发光特性进行了表征。观察到一个显著现象，即摩擦后GF产生的发光响应比之前更明显，这显然是由于在GF的磨损碎片中发现了石墨烯量子点。此外，将石墨烯引入YSZ:Er纳米颗粒（NPs）后，在施加摩擦后ZGCF的主要发光带出现了明显的红移。这是由于石墨烯与YSZ:Er NPs相互作用，在ZGCF的磨损碎片中形成了大量的石墨烯卷曲所导致的。可以得出结论，石墨烯构型的变化极大地影响了摩擦诱导的光致发光响应。我们的研究结果证明有必要进一步研究磨损表面的组成和形态，以便更好地理解光致发光与摩擦效应之间的关系。此外，这项工作提出了制备石墨烯量子点和纳米级卷曲作为摩擦诱导光致发光研究的一种新的潜在应用。
