【直播】Materials Futures Webinar 第二期共话纳米材料新进展

活动名称：

Materials Futures Webinar (第二期) | 纳米材料新进展

活动时间：

2022年8月24日（周三）10:00

报告嘉宾：

段镶锋 教授、刘树平 教授

主办单位：

Materials Futures

Materials Futures Webinar系列活动第2期将于北京时间2022年8月24日10:00举办。本次研讨会主题方向为纳米材料，由Materials Futures期刊副主编、松山湖材料实验室副主任、中科院物理所研究员张广宇主持。美国加利福尼亚大学洛杉矶分校教授段镶锋，以及香港理工大学应用物理系系主任刘树平教授将分别做精彩报告。

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Beyond van der Waals Heterostructures: High-Order Superlattices, Extended Thin Films and Artificial Materials报告一

The advent of two-dimensional atomic crystals (2DACs) and bonding-free van der Waals heterostructures has inspired a new thinking on heterostructure construction beyond the limits of lattice matching or processing compatibility requirements. Here I will discuss the exploration of van der Waals (vdW) interactions for bond-free integration of highly disparate materials beyond 2DACs to produce versatile heterostructures or artificial materials with designable electronic interfaces. I will start with a brief introduction vdW integration of pinning-free metal/semiconductor junctions or photodiode approaching the Schottky-Mott limit or the intrinsic excitonic photophyiscs limit, and then focus a unique class of vdW superlattices consisting of alternating 2D atomic layers and self-assembled molecular layers, with tailored structural symmetry, electronic band modulation and interlayer coupling, as a new artificial quantum solids for exploring emergent electronic, photonic, and exotic quantum phenomena. Next, I will introduce a unique design of vdW thin films that feature broad-area pinning-free vdW interfaces among the staggered nanosheets to ensure excellent electronic performance, and a sliding and rotation degree freedom to endow extraordinary mechanical stretchability, creating an exciting material platform for highly stretchable and adaptable electronic membranes. I will conclude with a brief perspective on exploring such artificial materials to unlock new physical limits and enable new device concepts beyond the reach of the existing materials.

报告人介绍

段镶锋 教授

美国加利福尼亚大学洛杉矶分校教授

英国皇家化学会会士

美国科学促进会会士

Dr. Duan received his B.S. Degree from University of Science and Technology of China in 1997, and Ph.D. degree from Harvard University in 2002. He was a Founding Scientist and then Manager of Advanced Technology at Nanosys Inc., a nanotechnology startup founded based partly on his doctoral research. Dr. Duan joined UCLA with a Howard Reiss Career Development Chair in 2008, and was promoted to Associate Professor in 2012 and Full Professor in 2013. Dr. Duan’s research interest includes nanoscale materials, devices and their applications in future electronic and energy technologies. Dr. Duan has published over 300 papers with over 80,000 citations, and holds >50 issued US patents. Dr. Duan has received many awards for his pioneering research in nanoscale science and technology, including MIT Technology Review Top-100 Innovator Award, NIH Director’s New Innovator Award, NSF Career Award, Alpha Chi Sigma Glen T. Seaborg Award, Herbert Newby McCoy Research Award, US Presidential Early Career Award for Scientists and Engineers (PECASE), ONR Young Investigator Award, DOE Early Career Scientist Award, Human Frontier Science Program Young Investigator Award, Dupont Young Professor, Journal of Materials Chemistry Lectureship, International Union of Materials Research Society and Singapore Materials Research Society Young Researcher Award, the Beilby Medal and Prize, the Nano Korea Award, International Society of Electrochemistry Zhao-Wu Tian Prize for Energy Electrochemistry, Science China Materials Innovation Award, AIP Horizons Lectureship, NanoMaterials Science Young Scientist Award and Materials Research Society Middle Career Researcher Award. He is currently an elected Fellow of Royal Society of Chemistry and Fellow of American Association for the Advancement of Science.

URL: http://xduan.chem.ucla.edu

Ferroelectricity in Two-Dimensional Heterobilayers报告二

Two-dimensional (2D) materials with out-of-plane (OOP) ferroelectric and piezoelectric properties are highly desirable to realize ultrathin ferro- and piezo-electronic devices. We demonstrate unexpected OOP ferroelectricity and piezoelectricity in untwisted, commensurate, and epitaxial MoS2/WS2 heterobilayers synthesized by scalable one-step chemical vapour deposition (CVD). The modulation of tunneling current by ~103 times in ferroelectric tunnel junction (FTJ) devices by changing the polarization state of MoS2/WS2 heterobilayers was demonstrated. Our results are consistent with density functional theory, which shows that symmetry breaking and interlayer sliding give rise to unexpected properties without invoking twist angles or Moiré domains.

刘树平 教授

香港理工大学应用物理系系主任

美国物理学会会士

Professor Shu Ping Lau obtained his Ph.D. degree in Materials Engineering from the University of Swansea in 1995. Prof Lau is a Chair Professor, and the head of the Department of Applied Physics at the Hong Kong Polytechnic University. Prof Lau is a Fellow of the American Physical Society. He served as guest editor of 6 journals and published 4 invited book chapters, as well as over 400 international refereed papers. His current research focuses on two-dimensional materials and energy materials, particularly the synthesis of 2D materials for ferroelectric, optoelectronic, electrocatalysis, and energy storage applications.

*Email: [e-mail]

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