基于La0.9Sr0.1Ga0.8Mg0.2O2.85新型极限电流型氧传感器的研究

对中温固体氧离子导体———La0.9Sr0.1Ga0.8Mg0.2O2.85材料分别在1300,1350,1400和1450℃4个温度下烧结4 h,之后对其进行XRD,SEM和阻抗谱等测试。实验结果显示:当烧结温度为1400℃时,样品为单一的La0.9Sr0.1Ga0.8Mg0.2O2.85晶体相,晶粒排列较为紧密,致密度达到96.6%,且不同温度下的电导率均最高。然后,选取在该温度下烧结的大小不同的两片陶瓷片制作了一种新型结构的电流型氧传感器。改变测试环境中的氧浓度的大小,在600,650和700℃3个温度下对传感器的气敏特性进行了测试。从测试的结果中发现:传感器极限电流与氧浓度并不呈现传统的线性关系。根据Fick第一定律、法拉第定律和Langmuir吸附方程对这种氧传感器的极限电流与氧浓度的关系进行了理论推导,得到了新的关系表达式,实验结果也验证了理论推导出的结果的合理性。此外,在温度为600℃时,对该传感器的响应时间进行了测试,上升和下降响应时间均为10～15 s。     

BES实验数据离线刻度

概述了北京谱仪(BES)各子探测器的实验离线数据刻度,包括主漂移室、飞行时间计数器、簇射计数器和μ子鉴别器.给出了BES1994年D_s运行期间的探测器运行性能,以及数据质量情况.     

重离子的束内散射

本文在Bjorken和Mtingwa束内散射理论的基础上进一步推导出了束内散射率的普遍表达式,并将该表达式应用于HIRFL—CSR的磁铁结构(lattice),计算并得到了束流横向发射度和纵向动量散度随时间变化的规律,结果表明,束内散射不会成为CSRlattice设计的障碍.     

Unravelling the Superiority of Nonbenzenoid Acepleiadylene as a Building Block for Organic Semiconducting Materials**

Acepleiadylene (APD), a nonbenzenoid isomer of pyrene, exhibits a unique charge-separated character with a large molecular dipole and a small optical gap. However, APD has never been explored in optoelectronic materials to take advantage of these appealing properties. Here, we employ APD as a building block in organic semiconducting materials for the first time, and unravel the superiority of nonbenzenoid APD in electronic applications. We have synthesized an APD derivative (APD-IID) with APD as the terminal donor moieties and isoindigo (IID) as the acceptor core. Theoretical and experimental investigations reveal that APD-IID has an obvious charge-separated structure and enhanced intermolecular interactions as compared with its pyrene-based isomers. As a result, APD-IID displays significantly higher hole mobilities than those of the pyrene-based counterparts. These results imply the advantages of employing APD in semiconducting materials and great potential of nonbenzenoid polycyclic arenes for optoelectronic applications.     

Highly Effective Hybrid Copper(I) Iodide Cluster Emitter with Negative Thermal Quenched Phosphorescence for X-Ray Imaging

The low efficiency triplet emission of hybrid copper(I) iodide clusters is a critical obstacle to their further practical optoelectronic application. Herein, we present an efficient hybrid copper(I) iodide cluster emitter (DBA)₄Cu₄I₄ , where the cooperation of excited state structure reorganization and the metallophilicity interaction enables ultra-bright triplet yellow-orange emission with a photoluminescence quantum yield over 94.9 %, and the phonon-assisted de-trapping process of exciton induces the negative thermal quenching effect at 80–300 K. We also investigate the potential of this emitter for X-ray imaging. The (DBA)₄Cu₄I₄ wafer demonstrates a light yield higher than 10⁴ photons MeV⁻¹ and a high spatial resolution of ≈5.0 lp mm⁻¹, showing great potential in practical X-ray imaging applications. Our new copper(I) iodide cluster emitter can serve as a model for investigating the thermodynamic mechanism of photoluminescence in hybrid copper(I) halide phosphorescence materials.     

Synthesis of Iron Nanometallic Glasses and Their Application in Cancer Therapy by a Localized Fenton Reaction

Metallic glasses and cancer theranostics are emerging fields that do not seem to be related to each other. Herein, we report the facile synthesis of amorphous iron nanoparticles (AFeNPs) and their superior physicochemical properties compared to their crystalline counterpart, iron nanocrystals (FeNCs). The AFeNPs can be used for cancer theranostics by inducing a Fenton reaction in the tumor by taking advantage of the mild acidity and the overproduced H₂O₂ in a tumor microenvironment: Ionization of the AFeNPs enables on‐demand ferrous ion release in the tumor, and subsequent H₂O₂ disproportionation leads to efficient ^.OH generation. The endogenous stimuli‐responsive ^.OH generation in the presence AFeNPs enables a highly specific cancer therapy without the need for external energy input.     

基于顶发射有机发光二极管的二阶微腔长度性能研究

在玻璃衬底生长金属铝作为不透明阳极,制备了结构为Al(100 nm)/TAPC(x nm)/TCTA(10 nm)/TCTA:Ir(ppy)3(10%,25 nm)/TPBi(30 nm)/LiF(2 nm)/Al(1 nm)/Ag(20 nm)/Alq3(y nm)作为顶发射的有机发光器件,其中x为30、130、160、170和180,y为20、40、60和80,研究了器件的二阶腔长及出光耦合性能。实验表明,通过改变空穴传输层的厚度,使器件微腔长度处于第二阶微腔效应增强区,可以提高器件的光电性能。同时当光输出耦合层厚度发生改变时,半透明阴极的光线穿透率与反射率发生改变,从而有效改善器件的光电性能。当微腔长度为230 nm、光输出耦合厚度为80 nm时,器件具有最佳的光电性能,并且光谱的角度稳定性强。器件最大亮度、电流效率和功率效率分别达到25 960 cd/m2、19.1 cd/A和16.01 lm/W。     

聚苯乙烯/银纳米粒子复合微球的合成及催化性能

首先通过乳液聚合和浓硫酸酸化制备表面富含磺酸根的磺化聚苯乙烯(PS)微球(直径532 nm),再用其静电吸附[Ag(NH_3)_2]~+离子,最后采用聚乙烯吡咯烷酮还原表面吸附的[Ag(NH_3)_2]~+离子,得到了负载银纳米粒子的PS/AgNPs复合微球.采用扫描电子显微镜、透射电子显微镜、紫外-可见光谱、红外光谱和X射线衍射表征了PS/AgNPs复合微球,并考察了其对甲基蓝(MB)的催化性能.结果表明,Ag纳米粒子高度分散在磺化PS微球表面;该PS/AgNPs复合微球对催化转化MB有较高的催化活性,并可多次重复利用.本研究在催化降解有机污染物方面有一定的实用价值.     

沸石型咪唑锌框架MAF-6的一价铜磷光掺杂

基于Cu(I)的配合物具有成本便宜和发光寿命长等有利于荧光传感的独到优势。但是,大部分Cu(Ⅰ)配合物在空气中不稳定,易被氧气氧化,或者比较难形成多孔框架。在沸石型咪唑锌多孔配位聚合物中,RHO-[Zn(eim)_2](MAF-6,Heim=2-ethylimidazole)由于其较大的孔径和优异的疏水特性而备受关注。本文利用Cu(I)离子与Zn(Ⅱ)离子相似的配位习性,用Cu(I)离子部分取代MAF-6中的Zn(II)离子,得到同构的磷光多孔配位聚合物Cu:MAF-6。该材料在极低氧气压力环境(600 Pa)中表现出非常灵敏的氧气荧光传感性能(Ksv=28.09 k Pa~(-1);检测限0.36 Pa)。     

分形等离激元黑金的热电子催化性能

借鉴电镀工业中过电流“烧焦”现象, 在过电流沉积条件下一步制备出等离激元黑金. 扫描电子显微镜、 透射电子显微镜、 X射线衍射和紫外-可见-近红外吸收光谱等表征结果显示, 该黑金是具有三维分形结构的多晶纳米金, 可以在 400~1800 nm宽波段范围内吸收光. 电催化甲醇结果显示, 黑金在宽波长光照下可以将甲醇的电催化效率提高 15.2%, 其主要贡献来源于等离激元生成的热电子, 而一小部分来自环境热. 在不同的单色光照条件下, 黑金的催化效率差别不大, 表明其对光能的利用没有明显的波长选择性.