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物理学院“博约学术沙龙”系列报告(总第 147 期)

发布日期:2017年12月10日
时  间:   2017年12月13日(星期三)下午15:00
地  点:   中心教学楼610
报告一:硕士生报告    时间: 15:00-15:30
题  目:多肽金团簇靶向结合上表皮生长因子受体(EGFR)的分子动力学模拟研究
报告人:张鹏        指导老师:赵宏康教授 赵丽娜副研究员
 摘要:贵金属(如金、银)团簇与生物分子(如蛋白质、肽)的结合产生一种新型复合材料。多肽金团簇是一种具有独特的物理化学性质和生物特性的纳米材料,在生物成像,生物分析,生物医药等领域有重要应用。上表皮生长因子受体(EGFR)是一种与肿瘤生长有密切关系的跨膜蛋白,是抗肿瘤药物的一个重要靶点。本研究中,我们基于特定的小肽序列和能够稳定存在的金团簇核心结构,设计了一个多肽金团簇复合分子,并通过分子对接和分子动力学模拟研究了多肽金团簇与EGFR的结合位点及其相互作用模式。模拟结果显示,我们设计的多肽金团簇不仅能够稳定的结合在EGFR上,为多肽金团簇在生物成像的应用提供了理论支持;同时多肽金团簇能够对EGFR的构象产生影响,有望在抗肿瘤治疗中发挥作用。           
报告二:硕士生报告    时间:15:30-16:00
题  目:The EMP formation in the Co(II) doped ZnTe nanowires
报告人:   刘玉婷       指导老师:邹炳锁
摘要:Transition metal ion doping in semiconductor can modify the electrical, optical and magnetic properties of semiconductors, bring about the field of diluted magnetic semiconductor in which the excitonic magnetic polaron (EMP) as a new excitation of exciton combination with ferromagnetic coupled spins was identified. Our group observed the formation of EMP in a series of TM (transition metal) doped wide-bandgap DMS (diluted magnetic semiconductors): Mn doped ZnO, ZnSe and(CH)3(NH)3Pb(Br)3. In addition, our group also shows that CdS: Co and ZnO: Mn NWs are excellent candidates for the observation of bosonic lasing due to the coherent transition of collective EMP.These II-VI semiconductors, which have the common characteristics of wide bandgap and high exciton binding energies, are easy to form an independent EMP with exciton-spin interactions. EMP is spin-polarized magnetic exciton, which may be controlled by the outside field to initiate more properties.
Zinc Telluride (ZnTe) belongs to compound of which the bandgap is approximately 2.28 eV(∼545 nm) at room temperature and the exciton binding energy is approximately 12.6 meV. II–VI semiconductors are demonstrated potential properties and widely used in lasers and photodetectors. ZnTe is an attractive material for various optoelectronic devices, such as green LEDs, nanosensors and photovoltaic cells. The exciton binding energy of ZnTe (12.6meV) has an intermediate magnitude in II-VI semiconductors. The cobalt ion has a 3d7 electron configuration and substitutes the cations of II-VI semiconductors. In early report by Arfan et al, the Mn and Ni doping in ZnTe nanobelts were found to be shifted to bandedge emission with the increasing excitation due to enhanced electron-phonon coupling, strong electron-electron correlation and carrier scattering, but without the EMP profile, which indicates a difficulty in the formation of EMP in TM doped ZnTe. In this paper, we prepared Co-doped ZnTe nanowires by the chemical vaper deposition (CVD) method and studied the power and temperature dependent emissions by micro-photoluminescence of nanowires. And in the prepared Co doped ZnTe nanowires, the clear indication of EMP profile was identified in single wire μ-PL detection.
报告三:硕士生报告    时间: 16:00-16:30
题  目:对于新的光伏材料铜铋硫薄膜的性质研究
报告人: 刘雨浓         指导老师:韩俊峰
摘要:铜铋硫(CBS),在可见光范围内有着合适的带隙和高吸收率,是潜在的光伏材。在这项工作中,主要对于生长的几个参数进行了优化。并且通过扫描电子显微镜、能量色散系统和x射线衍射等手段,对CBS薄膜的形貌、组成和结构进行了表征。所有这些测量表明,CBS薄膜是均匀的和紧凑的多晶薄膜的杂质相。同时,在第一次原理计算的基础上,进行了理论分析,对于相的形成和稳定性有了一定的了解。此外,CBS薄膜的光吸收边缘约为 900nm,表明带隙宽度在1.38 eV左右,并且薄膜有着很高的光吸收率。通过霍尔测试确认,空穴浓度可达到理想条件,适合作为P型候选吸收层。因此,铜铋硫化物是一种非常有潜力的光伏材料。