Chandrashekar Bananakere Nanjegowda, Smitha Ankanahalli Shankaregowda, Wu Yingchun, Cai Nianduo, Li Yunlong, Huang Ziyu, Wang Weijun, Shi Run, Wang Jingwei, Liu Shiyuan, Krishnaveni S, Wang Fei, Cheng Chun
Department of Materials Science and Engineering and Shenzhen Key Laboratory of Nanoimprint Technology, Southern University of Science and Technology, Shenzhen, 518055, P. R. China.
Department of Electronics, Yuvaraja's College, University of Mysore, Mysuru, 570006, India.
Sci Rep. 2019 Mar 8;9(1):3999. doi: 10.1038/s41598-019-40408-w.
Transfer method of chemically vapor deposition graphene is an appealing issue to realize its application as flexible and transparent electrodes. A universal stamping method to transfer as grown graphene from copper onto different flexible and transparent polymers (FTPs) reported here ensures simple, robust, rapid, clean and low-cost. This method relies on coating ethylene vinyl acetate (EVA) onto the as grown graphene, binding EVA coated graphene/Cu with FTPs and delamination by hydrogen bubbling process, which is analogous to the method used by stamping process where ink carries the imprint of the object onto any materials. The fate of the stamping method depends on how strongly the adhesion of EVA coated graphene/Cu with target FTPs. Interestingly, we have found that the thin film of EVA/graphene/Cu can only bind strongly with the FTPs of less than 25 µm in thickness and lower glass transition temperature value to the EVA while wide range of other FTPs are considered upon surface engineering to enhance the binding strength between FTPs and EVA. What's more, the electrical performance was investigated with a demonstration of triboelectric nanogenerators which confirmed the reliability of graphene transfer onto the FTPs and prospect for the development of flexible and transparent electronics.
化学气相沉积石墨烯的转移方法是实现其作为柔性透明电极应用的一个有吸引力的问题。本文报道了一种将生长好的石墨烯从铜转移到不同柔性透明聚合物（FTP）上的通用压印方法，该方法确保了简单、稳健、快速、清洁且低成本。此方法依赖于在生长好的石墨烯上涂覆乙烯-醋酸乙烯酯（EVA），将涂覆有EVA的石墨烯/铜与FTP结合，并通过氢气鼓泡过程进行分层，这类似于压印过程中油墨将物体印记转移到任何材料上所使用的方法。压印方法的效果取决于涂覆有EVA的石墨烯/铜与目标FTP之间的粘附强度。有趣的是，我们发现EVA/石墨烯/铜薄膜只能与厚度小于25 µm且玻璃化转变温度值低于EVA的FTP牢固结合，而在进行表面工程处理以增强FTP与EVA之间的结合强度时，考虑了范围广泛的其他FTP。此外，通过摩擦纳米发电机的演示研究了其电性能，证实了石墨烯转移到FTP上的可靠性以及柔性透明电子器件发展的前景。
