报告时间：2019年10月25日 10:00 ~ 12:00

报告地点：明故宫校区9号楼506会议室

主办单位：航空学院、机械结构力学及控制国家重点实验室

报告内容简介：

The two-dimensional (2D) materials have nearly-atomic thickness but extensive areas, and possess compelling diversity of properties. As example, the basic optics (light transmission, absorption, or reflection) of numerous 2D materials [1], as well as functionality of their defects [2] as single photon emitters (SPE), can be derived from the first-principles theories. The tantalizing properties, in turn, motivate the synthetic efforts, both in breadth (different compositions) and in quality (monocrystal wafers). We will discuss theories and mechanisms behind the recent advances in salt-assisted massive synthesis of a “library” of 2D-materials and alloys [3], in the evolutionary selection mechanisms of growth of ~1 m monocrystal graphene [4], and in vicinal-surface guided growth of single-crystal low-symmetry material like h-BN [5]. If time permits, the thread of developments in 2D boron research, from our early provocative hypothesis [6] to actual synthetic layer realizations [7], will also be discussed—a lesson and a success story in materials prediction.

[1] “In pursuit of 2D materials for maximum optical response”, S. Gupta et al., ACS Nano, 12, 10880, DOI: 10.1021/acsnano.8b03754 (2018).

[2] 2-level quantum systems in 2-D materials for single photon emission, S. Gupta et al., Nano Lett., 19, 408, DOI: 10.1021/acs.nanolett.8b04159 (2019).

[3] “A library of atomically-thin metal chalcogenides”, J. Zhou et al., Nature, 556, 355, DOI: 10.1038/s41586-018-0008-3 (2018).

[4] “Evolutionary selection growth of two-dimensional materials on polycrystalline substrates”, I. Vlassiouk et al., Nature Mater., 17, 318, DOI: org/10.1038/s41563-018-0019-3 (2018).

[5] “How the complementarity at vicinal steps enables growth of 2D monocrystals”, K.V. Bets et al. Nano Lett., 19, 2027, DOI: 10.1021/acs.nanolett.9b00136 (2019).

[6] “New balls, please”, Nature, 447, 4-5 (2007) | doi:10.1038/447004a.

[7] “Borophene as a prototype for synthetic 2D materials development”, A. Mannix et al., Nature Nanotech., 13, 444–450, DOI: 10.1038/s41565-018-0157-4 (2018). “Two-dimensional boron: structures, properties and applications”, Z. Zhang et al, Chem. Soc. Rev.46, 6746 (2017).

报告人简介：

Boris I. Yakobson is an expert in theory and computational modeling of materials and nanostructures, of their synthesis, mechanics, defects and relaxation, transport properties and electronics. Presently, Karl F. Hasselmann Endowed Chair in Engineering, professor of Materials Science and Nano-Engineering, and professor of Chemistry, Rice University, Houston, Texas. Received PhD 1982 in Physics and Applied Mathematics, from Russian Academy of Sciences. 1982-1989, Head of Theoretical Chemistry lab at the Institute of Solid Materials of the Russian Academy. 1990-1999, on faculty at the Department of Physics, North Carolina State University. Yakobson’s 1995 study in nanoscale mechanics attracted interest of Richard Smalley (Nobel Laureate), setting off a close collaboration, and in 1999 Yakobson joined Rice University, to work in nanotechnology area. (One aspect of that early study gave rise to what became known in literature “Yakobson Paradox”.) His research resulted in over 400 publications, eight patents, he has mentored a number of PhD students.