Speaker: Lau Shu Ping
Time: 10:00, Dec. 26th,2019
Venue: Room 205, Building 14, Wushan Campus
Abstract: The past few years have seen an explosion of interest in two-dimensional (2D) crystals derived from layered materials that possess strong in-plane bonding and weak van der Waals bonding between crystal planes. Layered 2D materials represent a diverse and largely untapped source of 2D systems with unusual electronic, magnetic and optical properties that are attractive for a wide range of applications from energy storage and catalysis for hydrogen evolution to electronics and optoelectronics. In this talk, the research activities related to 2D materials within the Department of Applied Physics will be reviewed. The bottom-up synthesis of graphene quantum dots  will be presented together with their optoelectronic properties. The strain engineering of 2D materials such as graphene, black phosphorus  and MoS2  will be discussed. The solution exfoliated BP flakes and quantum dots could enhance the performance of organic solar cells . Furthermore, it can also boost the performance of Li-S batteries significantly .
1.L.B. Tang, R.B. Ji, X. K. Cao, J.Y. Lin, H.X. Jiang, X.M. Li, C.M. Luk, S.J. Zeng, J.H. Hao and S. P. Lau, “Deep Ultraviolet Photoluminescence of Water-Soluble Self-Passivated Graphene Quantum Dots”, ACS Nano 6 (2012) 5102-5110.
2.Y.Y. Li, Z. Hu, S.H. Lin, S.K. Lai, W. Ji, S.P. Lau, “Giant Anisotropic Raman Response of Encapsulated Ultrathin Black Phosphorus by Uniaxial Strain”, Advanced Functional Materials 27 (2017) 1600986.
3.Y.Y. Hui, X. Liu, W. Jie, N.Y. Chan, J. Hao, Y.T. Hsu, L. J. Li, W. Guo, S. P. Lau, “Exceptional Tunability of Band Energy in a Compressively Strained Trilayer MoS2 Sheet”, ACS Nano 7 (2013) 7126-7130.
4.S.H. Liu, S.H. Lin, P. You, C. Surya, S.P. Lau, F. Yan, “Black phosphorus quantum dots used for boosting light harvesting in organic photovoltaics”, Angewand Chemie International Edition 44 (2017) 13717-13721.
5.Z.L. Xu, S.H. Lin, N. Onofrio, L.M. Zhou, F. Shi, W. Lu, K. Kang, Q. Zhang, and S.P. Lau, “Exceptional catalytic effects of black phosphorus quantum dots in shuttling-free lithium sulfur batteries”, Nature Communications 9 (2018) 4164.
Biography: hu Ping Lau is a Chair professor and Head of Department of Applied Physics at the Hong Kong Polytechnic University. He is also the Director of the University Research Facility on Materials Characterization and Device Fabrication. He obtained his Ph.D. degree in Materials Engineering from the University of Swansea. He has served as guest editor of 6 journals and published 4 invited book chapters. He has published over 340 international refereed papers with citations over 15,500 and a h-index of 63 according to Google scholars. His current research interest is in two-dimensional materials for energy harvesting/storage and optoelectronic devices including graphene quantum dots, VSe2 and black phosphorous.