Template Synthesis and UV-Vis Absorption Spectra of the Nanowire Arrays of Cadmium Chalcogenides

以多孔氧化铝为模板 ,用交流电分别通过含有相应的CdCl2 、ZnCl2 、单质S、Se等的二甲亚砜 (DMSO)溶液 ,沉积CdS、CdSe以及CdxZn1-xS半导体纳米线阵列并研究其紫外可见吸收光谱 .实验结果表明 ,当半导体纳米线的直径小于 2 5nm时 ,其吸收边相对于体相的吸收边产生蓝移 ,而且蓝移的幅度随着半导体纳米线直径的减小而增加 ,显示了明显的量子限域效应 .XU Shi_min, XUE Kuan_hong , KONG Jing_lin, SUN Dong_mei, FENG Yu_ying, LU Hai_yan (Dept. of Chem., Nanjing Normal Univ., Nanjing 210097, China) WANG Guang_hou (National Laboratory of Solid State Microstructures, Nanjing Univ., Nanjing 210093, China)The porous alumina membrane formed in the anodic oxidation of highly pure aluminum foil has attracted a great deal of attention in recent years [1] . It can be served as a desired template to prepare nanometer scale materials [2] due to its unique structure of discrete and cylindrical nanopores, paralleled one another, with the homogeneous size and distribution [3] . Chalcogenide semiconductors have promising prospect in the applications of photovoltaic [4] and photoconducting devices [5] and have been extensively exploited for many years. Olbright and his co_workers studied experimentally and theoretically the optical nonlinearties of CdS xSe 1-x _doped glass [6] ; Britt and Ferekides reported that the conversion efficiency in a solar cell of thin_film CdS/CdTe could be as high as 15.8% [7] . Here we report the fabrication and UV_Vis absorption spectra of CdS、CdSe and Cd xZn 1-x S nanowire arrays deposited into the template matrix of porous alumina. The diameters of these nanowires were varied from 10 nm to 50 nm in our experiments.作者联系地址：南京师范大学化学系!江苏南京210097,南京师范大学化学系!江苏南京210097,南京师范大学化学系!江苏南京210097,南京师范大学化学系!江苏南京210097,南京师范大学化学系!江苏南京210097,南京师范大学化学系!江苏南京210097,南京大学固体微结构国家重点实验室!江苏南京21009

Effect of Ti/PbO2 Electrodes Doped with Different Elements on Electrocatalytic Oxidation Characteristics of Phenol

本文在SnO2-Sb2O5氧化物为中间层的钛基体上，采用电沉积法制备了无掺杂的Ti/PbO2、掺杂F的Ti/PbO2（Ti/PbO2+F）和掺杂纳米Co3O4粒子的Ti/PbO2电极（Ti/PbO2+Nano-Co3O4）. 用X射线衍射（XRD）和扫描电镜（SEM）分析和观察了电极材料的组成、结构和形貌，并通过电化学方法研究了这三种电极对苯酚的电催化氧化性能. 结果表明，Ti/PbO2+F电极的析氧电位较Ti/PbO2电极的发生明显正移，但其苯酚的氧化峰和析氧峰并不能分开；而Ti/PbO2+Nano-Co3O4电极虽然其析氧电位负移，但对苯酚的氧化峰出现在析氧峰之前. 这一结果表明，体系存在着某种反应特别快的瞬态中间体，即在水分子被解离之前已与苯酚发生了反应，从而更有利于苯酚的转化和降解.Three types of electrodes, namely, Ti/PbO2, F-doped PbO2 (Ti/PbO2-F) and nano-Co3O4-doped PbO2 (Ti/PbO2+Nano-Co3O4) electrodes, were prepared by electro-deposition method on the Ti substrate with the interlayer of SnO2-Sb2O5. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used to study the compositions, structures and film morphologies of the electrodes. Electrocatalytic oxidation characteristics to phenol on the prepared electrodes were investigated by electrochemical method. The experimental results showed that compared with the Ti/PbO2 electrode, the potentials of oxygen evolution on the Ti/PbO2+F electrode apparently shifted more positively, while those of Ti/PbO2+Nano-Co3O4 electrode shifted negatively after the oxidation of phenol took place. This provided experimental evidence for the existence of some transient intermediates which underwent particularly fast reactions, i.e., the reaction of water molecule with phenol occurred before the dissociation of water molecule, which was more beneficial to the transformation and degradation of phenol.国家自然科学基金（No.20873051）和吉林省科技发展计划重点项目（No.20100326）资助作者联系地址：1. 吉林大学化学学院，吉林 长春 130012； 2. 江苏科技大学生物与化学工程学院，江苏 镇江 212003； 3. 吉林大学环境与资源学院，吉林 长春 130012Author's Address: 1. College of Chemistry, Jilin University, Changchun?130012, Jilin, China; 2. College of Biological and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang?212003, Jiangsu, China; 3. College of Environmental and Resource Sciences, Jilin University, Changchun?130012, Jilin, China通讯作者E-mail：[email protected]

Measurement of integrated luminosity of data collected at 3.773 GeV by BESIII from 2021 to 2024

We present a measurement of the integrated luminosity e+e- of collision data collected by the BESIII detector at the BEPCII collider at a center-of-mass energy of Ecm = 3.773 GeV. The integrated luminosities of the datasets taken from December 2021 to June 2022, from November 2022 to June 2023, and from October 2023 to February 2024 were determined to be 4.995±0.019 fb-1, 8.157±0.031 fb-1, and 4.191±0.016 fb-1, respectively, by analyzing large angle Bhabha scattering events. The uncertainties are dominated by systematic effects, and the statistical uncertainties are negligible. Our results provide essential input for future analyses and precision measurements

Determination of the number of ψ(3686) events taken at BESIII

The number of ψ(3686) events collected by the BESIII detector during the 2021 run period is determined to be (2259.3±11.1)×106 by counting inclusive ψ(3686) hadronic events. The uncertainty is systematic and the statistical uncertainty is negligible. Meanwhile, the numbers of ψ(3686) events collected during the 2009 and 2012 run periods are updated to be (107.7±0.6)×106 and (345.4±2.6)×106, respectively. Both numbers are consistent with the previous measurements within one standard deviation. The total number of ψ(3686) events in the three data samples is (2712.4±14.3)×10^