CdSe纳米结构单元的制备与自组装

纳米CdSe作为一种重要的半导体纳米材料,在发光二极管、生物标记、太阳能电池等领域有着广泛的应用。本文综述了CdSe纳米结构单元制备与自组装的最新研究进展。归纳出了6种有代表性的制备与组装方法,详细介绍了这些方法的原理以及采用这些方法制备的CdSe纳米结构。最后,对这一领域的发展方向作了展望。     

HT_c rf SQUID用于磁异常移动测量的初步研究

高温超导量子干涉器(HTcSQUID)磁强计的基本特点是噪声低、低频响应好、工作带宽大,在需要微弱磁场测量的许多技术领域发挥着重要作用,将其用于磁异常探测(MAD)是搜索地下/水下磁性目标物的有效技术。本文采用国产射频高温超导量子干涉器(HTcrf SQUID)磁强计,在非磁屏蔽环境中开展了移动状态下的磁异常探测实验,初步结果表明,基于HTcrf SQUID磁强计的MAD技术是一项具有研究和使用价值的新技术。     

Microwave-Assisted Rapid Preparation of Substituted Carbazole-9-acetic and Propionic Acids and their Absorption and Fluorescence Spectra

 A rapid one-pot synthesis of substituted carbazole-9-acetic and -propionic acids under microwave irradiation is described. N-Alkylation and hydrolysis was carried out in DMF without catalyst. The absorption and fluorescence spectroscopic characteristics of the title compounds are discussed.     

聚(3-己基噻吩)包覆富锂层状正极材料Li1.18Ni0.15Co0.15Mn0.52O2的制备与电化学性能

采用溶胶-凝胶法合成了Li_1.18Ni_0.15Co_0.15Mn_0.52O₂富锂层状正极材料, 并使用聚(3-己基噻吩)对其进行了表面包覆. 采用多种光谱学和电化学手段对材料的形貌结构和电化学性能进行了分析. 结果表明, 聚(3-己基噻吩)溶液浸泡后在富锂材料表面形成厚约1.5 nm的均匀包覆层. 表面包覆后富锂层状正极材料的极化和阻抗明显减小. 在0.2C倍率下, 经过100次充放电循环后, 未包覆的富锂材料放电比容量衰减为170 mA·h/g, 而经过0.3%聚(3-己基噻吩)包覆的材料的放电比容量则保持在205 mA·h/g, 容量保持率由68%提高到82%; 10C倍率下的放电比容量由72 mA·h/g提高到116 mA·h/g.     

Large-scale Ni-doped ZnO nanowire arrays and electrical and optical properties

Large-scale Ni-doped ZnO nanowire (NW) arrays are grown. The electrical conductivity of a single Ni-doped ZnO NW has been increased for 30 times. The photoluminescence (PL) spectrum of the doped ZnO NWs has a red shift, suggesting possible doping induced band edge bending. The doped NW arrays could be the basis for building integrated nanoscale transistors, sensors, and photodetectors.     

稀土-姜黄素-菲啰啉配合物荧光和抑菌活性研究

合成了稀土与姜黄素和1,10-菲啰啉的稀土三元配合物和稀土与姜黄素的稀土二元配合物, 通过元素分析、摩尔电导、热重-差热分析、 IR 、 UV-Vis 和1H NMR方法, 确定配合物的化学组成分别为: REL3L′及REL3 · 2H2O (RE=Sm, Eu, Dy, L=姜黄素, L′=1,10-菲啰啉). 同时研究了配合物在室温下的荧光性质, 结果显示稀土三元、 二元配合物都表现出配体(L)的特征发射且发射强度大于配体(L), 三元配合物的荧光强于二元配合物. 抗菌活性试验结果表明, 稀土三元、 二元配合物对枯草杆菌和大肠杆菌都表现出很好的抑制作用, 而且稀土三元配合物REL3L′对所选菌种的抑菌性明显强于稀土二元配合物REL3 · 2H2O和配体姜黄素.     

Cyclic voltammetric investigation of Eu<Superscript>3+</Superscript> on a MWCNTs/SDS-modified glassy carbon (GC) electrode

Electrochemical reduction behavior of Eu³⁺ on a multi-walled carbon nanotubes (MWCNTs)/sodium lauryl sulfate (SDS) (MWCNTs/SDS)-modified glassy carbon (GC) electrode was investigated by cyclic voltammetry (CV). Results indicated that the electrochemical reduction process of Eu³⁺ at the MWCNTs/SDS-modified GC electrode is a quasi-reversible and diffusion-controlled process. The value of standard rate constant (k _s) at the MWCNTs/SDS-modified GC electrode was estimated to 1.96 × 10⁻² cm s⁻¹. CV studies showed that the electrochemical response of Eu³⁺ was directly related to the ratio of MWCNTs to SDS, and the tube diameter of MWCNTs had a slight influence on the electrochemical behavior of Eu³⁺, whereas the tube length. of MWCNTs had a strong influence. CVs results also proved that s-MWCNTs (with shorter tube length)-modified GC electrode showed better response to the electrochemical reaction of Eu³⁺.     

Shape-controlled synthesis of Cu2O microcrystals by electrochemical method

Cuprous oxide (Cu₂O) microcrystals have been successfully synthesized via a facile electrochemical method in alkaline NaCl solution with copper plate and graphite slice as electrodes and Na₂Cr₂O₇ as additive. The as-synthesized products have been systematically studied by X-ray powder diffraction (XRD), field emission scanning electron microscope (FESEM), transmission electron microscope (TEM), selected area electron diffraction (SAED) and ultraviolet-visible spectrum (UV-vis). The results indicate that the pH value, temperature and potential play important roles in the morphology control besides the crystal habits of Cu₂O. The possible mechanism has been explored in the article.