Prof. Yun Chen
School of Electromechnical Engineering, Guangdong University of Technology
Speech Title: UV laser induced graphene technology and equipment
In the past decade, graphene has shown great value in both fundamental sciences and practical applications. In spite of the intense research efforts on achieving chemical-free, low-temperature processing of high-quality graphene, cost-effective synthetic methods to directly fabricate graphene sheets on a substrate are still lacking. Laser-induced graphene (LIG) is a recently developed method to directly form graphene from carbon-rich materials. In this work, we combined theoretical and experimental approaches to systematically investigate the light-material interactions in LIG fabrication processes. We first developed a molecular dynamics model to disclose the transient formation process of LIG and identified the critical parameters that govern this process. Following the theoretical prediction, we developed a system to utilize a picosecond ultraviolet (UV) laser to directly fabricate graphene from polyimide films at room temperature and under atmospheric pressure. After investigating the effects of the laser processing parameters on the LIG quality and subsequent processing optimization, we have experimentally demonstrated that picosecond UV laser processing can be used to prepare high-quality LIG. With the newly developed LIG, we fabricated several devices, eg. high sensitive proximity sensor, high performance super capacitor and liquid-solid triboelectric nanogenerator. The model and LIG system in this work may provide a feasible and economical way to fabricate graphene flakes for a wide range of applications.
Prof. Yun Chen received the B.S. (09) and Ph.D.(14) degrees in mechanical engineering from Central South University, Changsha, China. He was a Visiting Scholar with the Georgia Institute of Technology (2016-2017) and working as a Hong Kong Scholar Postdoctoral Fellow with The Chinese University of Hong Kong (2017-2019). He is currently a Professor with the School of Electromechanical Engineering and State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment, Guangdong University of Technology. He has authored more than 40 peer-reviewed journal papers (H index:12) and holds over 70 patents including 6 US patents. He won the first prize of Outstanding Scientific Research Achievement Award (Science and Technology) of Higher Education Institutions (2015), the first prize of Science and Technology Progress Award of Guangdong Province (2018), the second prize of Science and Technology Progress Award of the Machinery Industry Federation (2018), Excellent Doctoral Thesis Award of Hunan Province (2017), Best Poster Award of Hong Kong Scholars Annual Conference (2019). His research interests include semiconductor processing technology, microelectronics packaging technology and equipment development.