报告介绍 报告摘要： The electrocatalysis of molecular oxygen, that is, the oxygen reduction reaction (ORR) and the oxygen evolution reaction (OER), is a critically important redox reaction process for the conversion of chemical fuels into electricity, and conversely, as electron-supplying reaction for the electrocatalytic production of chemical fuels (storage of energy). In this presentation, he will share s...

报告介绍 报告摘要：Semiconductor nanocrystals of essentially every composition can nowadays be synthesized in large quantities by inexpensive and versatile solution based approaches. They are attractive for use as building blocks in different functional nanostructures. We provide an overview of strongly emissive semiconductor nanocrystals synthesized in our labs and demonstrate several approaches for nanocry...

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报告介绍 报告摘要：Covalent chemistry presumably occurs randomly on the graphene lattice of a single-walled carbon nanotube because electrons are delocalized over thousands of atomic sites. A small number of random defects, however, can completely destroy the remarkable electrical and optical properties of these atom-thick materials. In this talk I will discuss two projects focused on learning (1) where and ...

报告介绍 众所周知，石墨烯是一种二维晶体，最大的特性是其中载流子的运动速度达到了光速的 1/300，远远超过了电子在一般导体中的运动速度。在室温时载流子浓度为1012 cm−2时，石墨烯的声子造成的散射，将迁移率上限约束为200,000 cm2V−1s−1。与这数值对应的电阻率为10−6 Ω•cm，稍小于银的电阻率1.59 ×10−6 Ω•cm。所以，石墨烯同时也是非常优良的导体。对于氧化硅基板上面的石墨烯...

报告介绍 Dr. Xiang Cheng worked on the physics of granular materials with Sidney Nagel and Heinrich Jaeger at Department of Physics, University of Chicago and received his PhD in 2009. After graduation, he joined Itai Cohen’s group at Cornell University as a postdoctoral fellow, working on the microstructure of colloidal suspensions under shear and its relation to their macroscopic flow behaviors (rheo...

报告介绍 The development of modern nanoelectronics relies crucially on the identification of various novel types of quantized structures. In particular, the artificially synthesized quantum 1D structures show a variety of intriguing physical phenomena distinct from their bulk counterparts due to the confinement of electrons in only one direction. In most of the 1D structures, the significantly enhanced coupl...

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报告介绍 Throughout the history of mankind, scientists and engineers have relied on the slow and serendipitous trial-and-error approach for materials discovery. In 1990s, the combinatorial approach was pioneered in the pharmaceutical industry in order to dramatically increase the rate at which new chemicals are identified. The high-throughput concept is now widely implemented in a variety of fields in materi...

报告介绍 个人简介：Dr Tang is a Senior Lecturer (Associate Professor) in Energy in Chemical Engineering at University College London (UCL) and an Honorary Lecturer in Chemistry at Imperial College London.Dr Tang received his PhD in Physical Chemistry in Dalian Institute of Chemical Physics in 2001. Between 2002-2005, he had been a researcher and Japan Society for the Promotion of Science (JSPS) Fellow in the...

报告介绍 Abstract:Bi2Se3 is predicted to be a 3D topological insulator (TI) with a large band gap and a single Dirac cone. Although surface sensitive spectroscopy has revealed the nature of the surface Dirac fermion states in Be2Se3, due to the coexistence of the bulk and surface states, transport evidence of the surface Dirac fermion states has been elusive. In this talk, I will present our effort to tune t...

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报告介绍 Due to the reduced spatial dimensions, many intriguing quantum phenomenon arise in two-dimensional (2D) systems, such as graphene, 2D electron gas (2DEG) in semiconductor heterostructures, and the topologically protected surface state of topological insulator (TI). While transport measurements are traditional ways to study the 2D systems, various surface sensitive probes including scanning tunneling...