通过控制陷阱分布实现高灵敏度窄带近红外响应有机光探测器

近红外(NIR)窄带光电探测在机器视觉、医学检测、智能通信等领域具有重要应用.本文提出了一种基于激子解离窄化机制的改进型层级器件结构,以实现响应峰值为940 nm的近红外窄带有机光电探测器(OPD).系统研究表明,通过调节器件内部的陷阱态密度分布,可以有效地提高窄带探测器的外量子效率(EQE)峰值.最终,基于双激子耗散...     

Synthesis and Crystal Structure of a New Zn(Ⅱ) Complex Exhibiting Strong Luminescence

The title complex,[Zn(ip)2(H2O)2][ZnCl4]·H2O·2DMF 1(ip=imidazo[4,5-f][1,10] phenanthroline),has been synthesized via the slow evaporation of concentrated reaction solution at room temperature.It was characterized by single-crystal X-ray diffraction.Crystal data for C32H36Cl4N10O5Zn2:white prism,0.17mm×0.15mm×0.10mm,monoclinic,space group P2/c,a=11.928(8),b=9.868(6),c=16.520(11),β=104.879(12)°,V=1879(2)3,Z=2,Mr=913.25,Dc=1.614 g/cm3,F(000)=932,μ=1.616 mm-1,λ(MoKα)=0.71073,GOOF=1.045,R=0.0710 and wR=0.1755 for 3055 observed reflections with Ⅰ2σ(Ⅰ).X-ray diffraction study reveals that the title complex has an interesting 3D architecture via hydrogen bonding interactions and π-π interactions.The IR,TGA,XRD and luminescent properties of complex 1 were also studied.     

Synthesis,Crystal Structure,Spectroscopic Property and Redox Behavior of Zinc(Ⅱ) Complexes Containing Oligoaniline-functionalized Terpyridine Ligands

Two novel mono-nuclear zinc(Ⅱ) complexes with oligoaniline-functionalized terpyridine ligands have been synthesized and verified by 1H-NMR,13C-NMR,Elemental Analysis (EA) and X-ray Diffraction (XRD). The UV-vis spectra show the ligand-centered (LC) π-π* transitions and intra-ligand charge transfer (1ILCT) transitions,and the 1ILCT band red-shifts with the increasing number of aromatic amine groups in the ligands. Complex [Zn(L1)2](PF6)2 with an aromatic amine group in ligand shows a strong emission peak at 523 nm in the MeCN solution at 293 K and a blue-shifted band at 517 nm in the alcoholic glass at 77 K. However,for complex [Zn(L2)2](PF6)2 containing aniline dimer modified ligand,no apparent emission can be observed in the MeCN solution at room temperature due to a PET non-radiative decay pathway. Both of them show multiplicate redox processes based on oligoaniline and terpyridine units. The shifts of redox potentials also reflect the D-A interactions between the oligoaniline units and [Zn(TPY)2]2+ core.     

An ab initio Study on the Structural and Bonding Properties of Li_2Si_3O_7

A theoretical study on the structural and electronic properties of Li2Si3O7 is performed by using density functional theory(DFT) method.The molecular structure of the crystal and two kinds of [SiO4]-tetrahedra with different number of non-bridging oxygen(Qn) are analyzed.The structure of crystal Li2Si3O7 can be considered as a framework of corner-sharing tetrahedra.From the band structure(BS),total density of state(TDOS) and projected density of state(PDOS) of the crystal,the structures of Q3,Q4,and LiO4 tetrahedra as well as their bonding characters are presented.For lithium trisilicate,we find the bond cation-NBO(nonbridging oxygen and oxygen atoms bonding to one silicon atom only) is stronger than the bond cation-BO(bridging oxygen and oxygen atoms bonding to two silicon atoms).By analyzing the ionicity of two different types of bonds of silicon-oxygen according to the Mulliken population analysis,we also find that the Si-NBO bonds have higher ionicity than Si-BO for crystalline lithium trisilicate,which agrees with other lithium silicates.     

Synthesis,Crystal Structure and Luminescent Property of a New Copper(Ⅰ) Iodide Complex Based on 3,5-Dimethyl-4-amino-triazole

The title compound,[Cu4I4(C4H8N4)4],has been synthesized and characterized by single-crystal X-ray diffraction analysis.It crystallizes in monoclinic,space group Pbca,with a=18.1851(10),b=9.3697(5),c=19.8034(10),V=3374.3(3)3,C16H32Cu4I4N16,Mr=1210.34,Z=4,Dc=2.383 g/cm3,μ=6.183 mm-1,F(000)=2272,S=1.032,the final R=0.0309 and wR=0.1180 for 3854 observer reflections(I2σ(I)).The structure of the title compound consists of tetranuclear copper cluster units bridged by the halogen atoms with the 3,5-dimethyl-4-aminotriazole ligands coordinated to the metal ions through the triazole nitrogen atoms.The luminescent property of 1 was also studied.     

含羧酸酯侧基的聚芳醚酮酮醚酮酮的合成与表征

以含羧基侧基的聚芳醚酮酮醚酮酮(PEKKEKK-A)树脂为原料,二氯亚砜(SOCl2)、二氯乙烷(DCE)、吡啶为催化溶剂体系,合成带甲酰氯侧基的聚芳醚酮酮醚酮酮(PEKKEKK-C)树脂.PEKKEKK-C与甲醇、乙醇、丁醇、辛醇、苯酚等发生酯化反应,得到5种含羧酸酯侧基的聚芳醚酮酮醚酮酮(PEKKEKK-E)s.用红外光谱(FTIR)、氢核磁谱(1H-NMR)、广角X射线衍射(WAXD)、热失重(TGA)、示差扫描量热(DSC)等技术对其结构与性能进行了分析表征.结果表明,聚合物为非晶聚集态;玻璃化转变温度(Tg)在175.7～236.8℃之间,较PEKK有较大幅度提高;出现两次热失重平台,分别在335～365℃,460～505℃之间,第一次失重可能由于酯分解所致,第二次失重可能是分子主链开始分解;树脂能溶解于DMAc、NMP、二氯甲烷等普通有机溶剂中,溶剂挥发后成膜性良好,可制成透明薄膜;断裂伸长率在6.34%～15.43%之间,拉伸强度在74.68～85.35MPa之间。     

单斜层状结构锂离子电池正极材料LiY_xMn_(1-x)O_2的合成及其电化学性能

以Na2CO3、(CH3CO2)2Mn.4H2O、Y2O3和CH3COOLi.2H2O为原料,采用高温固相法经过2次灼烧和水热离子交换法得到一系列钇掺杂的LiMn1-xYxO2(x:0.01,0.02,0.03,0.05)化合物。通过XRD、XPS、循环伏安及恒电流充放电测试技术,研究了钇掺杂离子对合成正极材料结构及电化学性能的影响。结果表明,所得产物均具有单斜层状结构。合适的钇掺杂可以起到扩展锂离子脱嵌通道和稳定骨架结构的作用,钇离子的引入部分取代原有的三价锰离子,由于钇离子的离子半径较三价锰离子大,因此稀土掺杂锰酸锂材料的晶胞参数比未掺杂材料大,在一定程度上扩充了锂离子迁移的三维通道,更有利于锂离子的嵌入与脱嵌,提高单斜层状LiMnO2材料的电化学循环可逆性及循环稳定性。通过对所得化合物进行了钇掺杂量及电化学性能的研究,得到性能比较优良的LiY0.021Mn0.979O2化合物,其首次放电比容量为125.7mA.h/g,100次循环以后,放电比容量达212.1mA.h/g,远高于未掺杂材料的放电容量138mA.h/g。交流阻抗测试结果表明,Y3+的掺入能降低材料的电化学反应阻抗和提高材料中Li+的扩散能力。     

表面活性含氟单体-丙烯酰胺共聚物溶液性质研究

以异佛尔酮二异氰酸酯(IPDI)、十二氟庚醇(FOH)、烯丙基聚乙二醇(APEG)合成的表面活性含氟单体(FSM)与丙烯酰胺通过水溶液聚合,制备出含氟疏水缔合聚丙烯酰胺(FPAM).用表面张力法研究了FSM的胶束化,用流变仪、动态激光光散射(DLS)和原子力显微镜(AFM)表征了FPAM溶液的流变性能、缔合结构尺寸和形态.结果表明,FSM在25℃下CMC为1.28 g.L-1,表面张力为26.77 mN.m-1.FPAM溶液属于假塑性体系,临界缔合浓度为0.660%,具有一定的耐盐性.DLS和AFM表明,在低于临界缔合浓度时FPAM溶液仍能产生大量的缔合结构,FPAM分子具有很强的疏水缔合性.     

氮掺杂二氧化钛-氧化镍双层薄膜的光电致色特性

以金属钛为靶材、O2/N2/Ar混合气氛为溅射气体,在导电玻璃(ITO)表面磁控溅射一层薄膜,再经300-500℃退火处理制备了氮掺杂TiO2薄膜.采用X射线衍射(XRD)、X光电子能谱(XPS)、扫描电子显微镜(SEM)和紫外-可见吸收光谱等对薄膜的微观结构、光学特性和光电化学性能等进行了研究.进而采用化学沉积的方法在TiO2-xNx薄膜表面沉积上一层多孔NiO薄膜,研究表明,制备的ITO/TiO2-xNx/NiO双层薄膜具有明显的光电致色特性,400℃退火处理的氮掺杂TiO2薄膜具有最高的光电流响应,经氙灯照射1h后,薄膜从无色变成棕色,500nm波长处光透过率从79.0%下降至12.6%.     

氧化钛-氧化石墨插层结构及其光催化性能(英文)

采用氧化石墨(GO)和硫酸钛作为初始反应物,在低温下(80℃)制备了纳米级的氧化钛-氧化石墨插层(TiO2-GO)复合材料,研究了这一复合材料的紫外光催化性能.结果表明,在采用TiO2-GO插层复合材料对甲基橙溶液进行紫外光催化降解时,其降解效率η=1.17mg·min-1·g-1,明显优于德固赛P25氧化钛粉.通过对TiO2-GO插层复合材料进行X射线衍射(XRD)、傅里叶红外(FT-IR)光谱、X射线光电子能谱(XPS)和场发射扫描电子显微镜(FESEM)等测试,表征了产物的晶相结构、界面状况及其显微结构.结果表明:插层结构中的TiO2晶粒为锐钛矿和金红石的混合相,且锐钛矿相含量大于金红石相含量;氧化石墨层间的含氧基团如C襒O,基本被还原.对TiO2-GO插层复合材料的形成机理以及该材料具有优越光催化性能的原因进行了探讨.