【学术视频】第五届二维材料国际会议 | 德国明斯特大学Harald Fuchs教授

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图 | Harald Fuchs

题目：Controlling electronic properties and chemical reaction kinetics in low-dimensional systems

报告人：Harald Fuchs

单位：University of Muenster, Germany

时间：2019-10-22

地点：苏州金鸡湖国际会议中心

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报告摘要

The electronic and optical properties of inorganic systems as well as the reaction behavior of organic molecules strongly depend on their dimensionality and/or that of their environment. Thus, controlling the dimensionality as well as the bond order in 0D, 1D and 2D systems at the sub-nanometer scale, their physical properties may qualitatively deviate from that of 3D bulk materials of the same chemical composition. For example, materials such a graphene exhibit excellent mechanical and thermal properties as well as high 2D electronic mobility. However, in their unmodified state these Dirac systems are lacking a finite electronic band gap, required for generating transistors. Graphene nanoribbons, representing 1D systems, on the other hand, allowed to overcome this limitation by using bottom up on-surface chemistry to control the ribbon latitude and thus, the band gap. In contrast, in other 2D systems such as Chalcogenides, finite band gaps are found. However, it is still a technical challenge here to grow large-scale systems with well-defined geometry for application in opto-electronic device. Our recent STM investigations on phosphenes and antimonene using UHV epitaxial growth revealed promising perspectives in these directions.

In the case or organic molecules, surfaces represent 1D or 2D spatial confinements for on-surface chemistry allowing a unique regioselective and kinetic control of chemical reaction schemes which otherwise cannot be done in liquid- or gas phase chemistry. In addition, surfaces can act catalytically and by reconstruction or faceting, and the confinement can display one- or zero dimensional character. Advanced LT-UHV Scanning probe techniques (LT-STM, nc-AFM) allow a detailed sub-molecularly resolved analysis of the reaction pathways, including intermediates, while complementary PES techniques (XPS/UPS) reveal the chemical reaction status of molecular systems. A novel type of nc-AFM tip developed in our group allows us to quantitatively characterize individual chemical bonds and even their bond-order with unprecedented precision.

Finally, the construction of high performance functional organic opto-electronic devices, following the biological self-organization approach can be done bottom up by combining nanotechnological methods with chemistry. Self-assembled pre-patterned interface layers, for example, allow to grow functional molecular layers in OFET/OSC structures in a well-controlled way, resulting, for example, in a significant increase in charge carrier mobility by more than one order of magnitude, without modifying the chemical systems making up the active OFET channel structures. Similarly, flexible organic photo responsive systems with ultrahigh detectivity can be generated.

个人简介

Harald Fuchs is a Professor of Experimental Physics at the University of Münster, Germany. Hespent from 1984 –1985 a post-doctoral year with IBM Research Laboratory Zurich in the groupof G. Binnig & H. Rohrer. From 1985-1993 he was heading the ‘Ultrathin Organic Films' projectwith BASF AG, Germany, before he became in 1993 a Full Professor and Director of the PhysicalInstitute of the University of Münster. He is the founder of the Center for nanotechnology (CeNTech) in Münster and its scientific director since 1993. His research focuses on nanoscale science andnanotechnology, ranging from scanning probe microscopy to self-organized nanostructurefabrication, and nano-bio systems documented in more than 500 peer reviewed publications andover 30 patents. H. Fuchs is an elected member of the German National Academy of Science 'Leopoldina', the German National Academy of Science and Engineering 'acatech', and the 'TWAS'.

会议简介

The 5th International Conference on 2D Materials and Technology was held in Suzhou, China, October 21-24, 2019. Prestigious scientists presented and stimulated discussions over some inherent topics of the ICON-2DMAT, including the Synthesis and Characterizations, Physics and Chemistry, Device applications, Theory and Modeling of 2D materials and heterostructures, etc. And, a special session related to the Vacuum Interconnected Nanotech Workstation (Nano-X) in Suzhou Institute of Nano-Tech and Nano-Bionics was be set up, which was dedicated to introduce a large scientific facility to 2D materials and technology. Specific forums and some other Symposia co-organized with preeminent academic publishers was be also established to foster academic and business networking.

主办方：中国科学院苏州纳米技术与纳米仿生研究所

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