Wang Zhao, Liu Wenlin, Shao Jiaxin, Hao He, Wang Guorui, Zhao Yixuan, Zhu Yeshu, Jia Kaicheng, Lu Qi, Yang Jiawei, Zhang Yanfeng, Tong Lianming, Song Yuqing, Sun Pengzhan, Mao Boyang, Hu Chenguo, Liu Zhongfan, Lin Li, Peng Hailin
College of Science, Northwest Agriculture & Forest University, Yangling, P. R. China.
School of Materials Science and Engineering, Peking University, Beijing, P. R. China.
Nat Commun. 2024 Aug 13;15(1):6957. doi: 10.1038/s41467-024-51331-8.
The high-intactness and ultraclean fabrication of suspended 2D materials has always been a challenge due to their atomically thin nature. Here, we present a universal polymer-free transfer approach for fabricating suspended 2D materials by using volatile micro-molecule cyclododecane as the transfer medium, thus ensuring the ultraclean and intact surface of suspended 2D materials. For the fabricated monolayer suspended graphene, the intactness reaches 99% for size below 10 µm and suspended size reaches 36 µm. Owing to the advantages of ultra-cleanness and large size, the thermal conductivity reaches 4914 at 338 K. Moreover, this strategy can also realize efficient batch transfer of suspended graphene and is applicable for fabricating other 2D suspended materials such as MoS. Our research not only establishes foundation for potential applications and investigations of intrinsic properties of large-area suspended 2D materials, but also accelerates the wide applications of suspended graphene grid in ultrahigh-resolution TEM characterization.
由于二维材料原子级薄的特性，制备高完整性和超洁净的悬浮二维材料一直是一项挑战。在此，我们提出一种通用的无聚合物转移方法，通过使用挥发性小分子环十二烷作为转移介质来制备悬浮二维材料，从而确保悬浮二维材料表面的超洁净和完整性。对于制备的单层悬浮石墨烯，尺寸小于10 µm时完整性达到99%，悬浮尺寸达到36 µm。由于具有超洁净和大尺寸的优点，其在338 K时热导率达到4914 。此外，该策略还可实现悬浮石墨烯的高效批量转移，适用于制备其他二维悬浮材料，如MoS。我们的研究不仅为大面积悬浮二维材料的潜在应用和本征特性研究奠定了基础，还加速了悬浮石墨烯网格在超高分辨率透射电镜表征中的广泛应用。
