报告介绍 Abstract： Over the last few decades, catalytic chemical vapor deposition (CVD) has matured as a synthetic technique for producing many low-dimensional inorganic nanomaterials, such as carbon nanotubes (CNTs), graphene and boron nitrides. The general mechanism of graphene and CNT formation during CVD is now well established [1]. I will present recent insights from quantum chemical simulations detail...

报告介绍 Abstract： 　　X-ray nanochemistry is a new desipline that has been researched for nearly two decades. It was formally named in 2012. X-ray nanochemistry studies how to use nanomaterials to increase the effectiveness of X-ray radiation. An example is to use an X-ray scintillating nanoparticles to absorb X-rays and emit UV-Vis photons and then use dye molecules to resonantly absorb the photons and ge...

报告介绍 Abstract： Electron-phonon (e-ph) interactions play an important role in condensed matter, since they inu-ence the properties and lifetimes of both the electron and the phonon quasi-particles. In addition,tuning e-ph offers great promise for material design at the nanoscale [1]. Although _rst-principlesstudy of e-ph has been made for simple, prototypical materials over the last decade [2,3,4,5], ap-...

报告介绍 报告人简介：　　任伟教授，在香港大学获博士学位，之后在香港科技大学做博士后，在美国阿肯色大学任研究助理教授。在铁电畴壁应变效应、极化涡旋结构调控、自旋霍尔电导涨落等方向有深入研究。在磁电多铁材料和量子输运领域发表SCI论文100多篇，含多篇PRL，Nature子刊，PRB，Adv. Mater.）。主持国家自然科学基金面上项目、上海东方学者、教委曙光计划、科委启明星等项目，并承担科技部青年973、上海市材料基因组工程项目。2014年主...

报告介绍 Abstract： 　　Interfacial engineering via the artificially constructed structures of ultrathin thickness compared to the wavelength has enabled a plethora of advanced manipulations of light-matter interactions. In particular, the low-dimension and high-frequency scaling may promise a lot more interesting applications, while the challenges in design principle and fabrication capability will become c...

报告介绍 Abstract： 　　Hydrothermal technique is a useful method to prepare ceramics powders with controlled size and morphology. We need high temperatures to prepare rare earth oxides under hydrothermal conditions, because many compounds such as hydrates, hydroxides, and oxyhydroxides are stable at low temperatures. However, these low temperature stable compounds were transformed to oxides by calcination a...

报告介绍 Abstract: 　　Two-dimensional (2-D) transition metal oxide layers have attracted significant interest during the past decade due to their novel emergent properties and their high potential for nanotechnology applications [1]. For practical reasons 2-D oxide layers are usually supported on metal surfaces. This leads to a coupling of the oxide overlayer to the metal substrate, often strong coupling, w...

报告介绍 Abstract:　　Polymers representing soft materials exhibit a variety of functional properties undergoing energy storage, transport and conversion. Among them, we focus our attention on polyvinylidene fluoride (PVDF: -CH2CF2-) and its copolymer with trifluoroethylene (TrFE: -CHFCF2-). They attracted continuous interest over 40 years because of their intriguing ferroelectric and piezoelectric propertie...

报告介绍 Abstract： We discover surprising consequences of the well-known quantum effects such as zero-point Quantum coherence is a key concept in chemical physics and will be discussed in the context of charge mobility/exciton diffusion in organic semiconductors and energy transfer in light-harvesting complexes. I. Coherent quantum transport in disordered systems displays an optimal diffusion constant at an...

报告介绍 Abstract: 　　Two-dimensional electron systems (2DES) formed in semiconductor heterostructures host a rich variety of transport phenomena. At low magnetic field, irradiated heterostructures reveal microwave-induced resistance oscillations (MIRO) and associated zero-resistance state. In this talk, I will give an overview on the main transport phenomena occurring in 2DES when it is driven by microwave...

报告介绍 报告摘要：　　Photoinduced charge transfer plays a key role in the conversion of solar energy. In this work, we introduce a hierarchy of post-Marcus methods based on the linearized semiclassical (LSC) method for calculating the charge transfer rates in organic photovoltaic material. The LSC approximation provides a flexible, rigorous and self-consistent framework for developing computationally feasi...

报告介绍 报告摘要：　　碳基材料在能源转化领域具有广阔的应用前景。目前，有关碳基催化剂的研究仍处于调控粉末状碳材料的微结构和组分阶段。而在实际的电催化应用过程中，往往需在所制备的碳基粉末催化剂中加入聚合物粘合剂（如Nafion 和PVDF），再压制成一定形状的薄膜。然而，聚合物粘合剂的引入会对碳基催化剂的结构和性能造成显著的不利影响。此次报告将围绕这一科学问题和技术挑战，介绍一类新颖的基于聚离子液体的氮掺杂多孔碳膜，这...

报告介绍 Abstract:　　 “Publish or Perish” is an often-heard expression. It is true that a scientist, who does not publish his or her scientific results in a reputable (electronic) journal, will not receive the necessary recognition or scientific respect as a scientist. In this presentation I will discuss some of the various key parameters that are used in scientific publishing to indicate the impact or su...

报告介绍 报告摘要： 固体的局域结构是研究固体在原子到纳米范围内原子的空间排布。纳米固体结构由于表界面效应，长周期的平均晶体结构往往不能准确描述纳米颗粒的本征属性，其结构的局域化需要局域结构的方法和手段表征。本课题组近年对无机固体和纳米固体，如合金PtNi、PtFe、永磁体Ho2Fe17，氧化物CeO2、SnO2 、TiO2，氟化物ScF3等，开展了局域结构和负热膨胀及相关物性的研究。高能同步辐射X射线/中子全散射技术（PDF/nPDF），结合反向蒙...

报告介绍 报告摘要：　　Small angle neutron scattering (SANS), resonant inelastic X-ray scattering (RIXS) and X-ray absorption spectroscopy have been carried out to study the correlations of magnetic properties and electronic/atomic structures in an XY-like spin-glass (SG) state of Ni0.4Mn0.6TiO3 (NMTO) single crystal. SANS presents the texture of toroidal glass and H (magentic)-T (temperature) phase diagram ...

报告介绍 Abstract:　　Superconductivity was and continues to be the most astonishing collective electronic state of electrons in metals. Electricity can be transported without energy loss, and the superconducting state causes magnetic fields to be expelled or excluded from the metal. This latter property enables the superconducting state to be demonstrated on a tabletop: levitation of a magnet above a superc...