报告介绍 报告摘要： 电子在磁场中由于受到洛仑兹力而产生霍尔效应，然而声子作为电中性的准粒子却不能与磁场相互作用，所以在2005年当声子霍尔效应在顺磁材料中被实验发现时，人们很惊讶，其后续的理论解释也一直存在争议。我们得到声子霍尔效应在弹道输运量子器件中的存在,提出了声子霍尔效应热导率的拓扑表述, 并发现了声子霍尔效应中的拓扑相变现象 最近，通过半经典的波包动力学方，我们得到各种热霍尔效应的利用贝利曲率表达的通用霍尔...

报告介绍 Abstract： “What is the value of scientific research? Everybody knows that in our days more than ever before a man or a woman who wishes to make a genuine contribution to the advancement of science has to specialize, … Being engaged in such a specialized activity one naturally at times stops to think what it is good for. Has the promotion of knowledge within a narrow domain any value in...

报告介绍 报告摘要： Electronic transport of charge and spin can be controlled by external electric and magnetic fields. One of the most remarkable transport phenomena at mesoscale and nanoscale is the universal conductance fluctuation. Due to the quantum interference, the amplitude of such fluctuation stays constant independent of the average conductance and sample details. Based on a variety of nanomaterial...

报告介绍 Abstract： 　　Electrochemical scanning tunnelling microscopy (EC-STM) is a powerful tool which gives the opportunity to investigate surfaces and its adsorbates with unprecedented resolution under in-situ electrochemical conditions. During EC-STM experiment, the tunnelling current between the tip and the substrate is measured. Due to its working principle, EC-STM can’t image insulator. However...

报告介绍 报告摘要： 　　石墨烯是一种由单层碳原子构成的具有六角蜂窝结构的二维材料，它的很多新奇电学性质是由其晶格结构决定的。过去几年，我们一直致力于通过晶格对称性破缺来调控石墨烯的能带结构和电学性质。在本报告中我将介绍晶格对称性破缺在石墨烯中引入的几种新奇量子物态，包括缺陷引入的磁性、转角引入的non-Abelian规范势和新奇手征费米子、AB-BA畴界中的拓扑边界态等。报告人简介：　　何林2009年7月于北京大学物理学院获得博...

报告介绍 Abstract：Carbon monoxide, CO, serves as the most important tracer to map molecular abundance in the universe. Furthermore, CO is involved in many physical, chemical and biological processes on Earth.  In order to observe and study processes involving CO in the laboratory, sensitive and quantitative experimental detection schemes for nascent CO are of obvious importance and much effort has ther...

报告介绍 Abstract： Inorganic nanoparticles (NPs) have the ability to self-organize into variety of extended and terminal structures and so do many molecular and nanoscale compounds given sufficient number of translational and rotational degrees of freedom. Analysis of experimental data for all NPs (metal, semiconductor, ceramic..) indicate a general trend of self-assembly under a much wider range of co...

报告介绍 Abstract: Classical approach accounting for ionic colloids (ICs) was established in the 40’s by the joint effort of Derjaguin & Landau and Verwey & Overbeek; known as DLVO theory. Though successful in explaining stability of ICs the DLVO addresses half story, namely the interplay between attractive and repulsive interaction among the colloidal particles, given the surface charge densit...

报告介绍 Abstract： Our laboratory recently develops Polymer-Assisted Metal Deposition (PAMD). PAMD allows ambient fabrication of flexible, foldable, stretchable, compressible, and wearable metal (especially Cu) conductors with very high conductivity. The key innovation of PAMD is the use of a thin and functional polymeric interfacial layer that assists electroless deposition (ELD) of metal thin films and pa...

报告介绍 Abstract： Due to their stability associated to their excellent catalytic properties, NHC-metal complexes (NHC= NHeterocyclic Carbene) have been extensively used for a wide range of reactions. However, their syntheses in solution are highly substrate-dependent and require long reaction times and excess of reagents. A convenient way to increase the efficiency and to reduce the environmental impact of...

报告介绍 报告摘要： 自从功能介孔材料问世以来，引起了人们广泛兴趣。其特殊的介观结构和性质，超高比表面，超大的孔容，大而均一可调的孔径，在石油裂化、催化、吸附、分离等方面，尤其是生物药物传递、检测、诊断具有广阔的应用前景。我们将围绕功能介孔材料的发展，重点介绍了一种采用两亲性表面活性剂、嵌段共聚物模板法合成高度有序的新型功能介孔材料及其在载药、荧光检测等方面的应用。首先我们将介绍最近发展的几种新的合成方法，包...

报告介绍 Abstract： In this talk, I will summarize the recent research on synthesis, characterization and applications of two-dimensional nanomaterials in my group. I will introduce the synthesis and characterization of novel low-dimensional nanomaterials, such as graphene-based composites including the first-time synthesized hexagonal-close packed (hcp) Au nanosheets (AuSSs) on graphene oxide, surface-...

报告介绍 报告摘要：　　黄嘉兴教授2000年本科毕业于中国科学技术大学化学物理系，2004年于美国加州大学洛杉矶分校取得化学博士学位，2004-2007年获得加州大学伯克利分校米勒研究奖资助并加入杨培东教授实验室从事博士后工作。2007起在美国西北大学材料科学与工程系工作。黄老师的研究方向为材料化学与加工，发表了很多原创性的工作．　　黄嘉兴老师的研究组一直实践这样一个理念：通过科研和教学来创造具有潜在用途的新知识，材料和技术；来...

报告介绍

报告介绍 Abstract： 　　Carbon materials are of immense practical importance, but are often known as structurally ill-defined “black stuff” such as soot. Graphenes and graphene nanoribbons (GNRs), their geometrically restricted cutouts, are new additions to the carbon family which are widely praised as multifunctional wonder materials and rich playgrounds for physicists. Indeed, graphenes hold en...

报告介绍 报告摘要： 贵金属催化剂具有很高的催化活性，是电化学能量转换与储能过程的核心材料，但高昂的成本限制了其在产业化中的广泛应用。基于纳米结构碳和过渡金属氧化物的非金属和非贵金属电催化剂在能源转化过程中具有与贵金属类似的催化活性。通过对纳米结构碳基电催化剂的杂原子掺杂可以进一步提高其在电化学氧还原反应（ORR）、产氧反应（OER）和产氢反应（HER）中的催化活性。在我们的研究中，将石墨烯/多孔碳复合材料进行非贵金属...