纳米片组装的Zn_2SnO_4空心八面体分级结构的制备与发光性能(英文)

以乙酸锌、四氯化锡、氢氧化钠为原料,在200℃用L-赖氨酸辅助合成纳米片组装的锡酸锌(Zn2SnO4)空心八面体分级结构。采用XRD、FESEM、TEM、HRTEM等对样品进行了表征,结果表明产物为立方相的Zn2SnO4,单个八面体的棱长在1～2μm,并且表面以及棱上长有许多尺寸在200～400nm的纳米片。此外,结果还表明,氢氧化钠和L-赖氨酸的加入量对八面体形状的形成起到了决定性的作用。产物的室温光致发光谱图说明所制备的产物在500～600nm有很强的发光性能。     

Performances of ZnO-Based Dye Sensitized Solar Cells Fabricated by Hydrothermal Synthesis and Sol-Gel Technique

ZnO is introduced as an alternative to TiO2 in dye sensitized solar cells （DSSCs） due to its band gap similar to TiO2, higher electron mobility, and flexible procedures of preparations. Several samples of ZnO films are prepared with the hydrothermal synthesis method and the sol-gel technique, respectively. These ZnO films were assembled as photoanodes in DSSCs using N3 dye as the sensitizer. The ZnO-based cells prepared by the hydrothermal synthesis show typical current source characteristics, whose fill factor （FF） is 0.44 and photo-to-electric power conversion efficiency is 0.34%. On the other hand, all the samples prepared with the sol-gel technique show accompanied source characteristics with relatively higher power conversion efficiencies （1%） but a lower FF （0.26）. X-ray diffraction （XRD） and atomic force microscopy （AFM） measurements indicate that the sol-gel samples have small particles sizes. Therefore, sol-gel samples could adsorb more dye molecules to generate high conversion efficiencies. At the same time, more grain boundaries make it more possible for injected electrons to recombine with the oxidized electrolyte. Hydrothermal samples have bigger grains, so they show poor conversion efficiency and relatively high FF.     

烯唑醇铜和银配合物的水热合成与晶体结构(英文)

合成了2个新的烯唑醇铜和银配合物:[CuL4Cl2](1),[AgL2]NO3(2)(L=diniconazole)。通过元素分析、红外光谱和X-ray单晶衍射对其结构进行了表征。结构分析表明,1属三斜晶系,P1空间群,晶胞参数为a=0.882 3(7)nm,b=1.370 5(10)nm,c=1.516 4(11)nm,α=91.507(11)°,β=97.356(9)°,γ=107.683(9)°。2属单斜晶系,P21/c空间群,晶胞参数为a=1.229 2(3)nm,b=1.272 1(3)nm,c=2.431 7(5)nm,β=98.694(3)°。1和2都由分子间氢键连接成一维链结构。     

Mn离子掺杂对α-FeOOH结构和形貌的影响

本文采用水热合成方法,在120℃碱性条件下制备出形貌均一的短棒状α-FeOOH纳米粒子,对其进行了金属离子Mn的掺杂。系统研究了Mn离子掺杂对产物物相结构和形貌的影响,对产物进行了X射线衍射(XRD)、红外光谱(IR)、穆斯堡尔谱(MES)、场发射扫描电镜(FE-SEM)和高分辨透射电子显微镜(HRTEM)表征。结果表明:低浓度Mn离子掺杂对α-FeOOH的形成起了形貌和物相调控作用。α-FeOOH纳米棒的长径比随着Mn离子加入量的增大逐渐增加;当nMn(Ⅱ)/nFe(Ⅲ)=0.30时,产物变成了α-(Fe,Mn)OOH和MnFe2O4的混合物,形貌为纳米棒和纳米颗粒。     

新型三维金属-有机骨架[Er2（HO-bdc）2（m-bdc）（phen）]·3H2O的水热合成及晶体结构（英文）

以5-羟基间苯二甲酸(HO-H2bdc)、5-甲基间苯二甲酸(m-H2bdc)和1,10-菲啰啉(phen)为配体,在水热条件下合成了饵金属-有机骨架[Er2(HO-bdc)2(m-bdc)(phen)].3H2O。通过X-射线单晶衍射仪测定其晶体结构,结果表明该化合物包含一个三维[Er2(HO-bdc)2(m-bdc)(phen)]框架,而结晶水分子位于其中。该化合物中丰富的氢键作用和1,10-菲啰啉芳香环之间的π-π堆积作用进一步稳固了其三维结构。     

改进水热法制备BiFeO3粉体及其磁性研究

以Bi(NO3)3.5H2O和Fe(NO3)3.9H2O为原料,采用改进的水热法制备了BiFeO3微晶。采用浓度为0.1mol/L的前驱物沉淀制备得到非常均匀的尺度为10μm的微球,经超声分散可以得到100 nm的均匀颗粒。XRD研究表明BiFeO3纳米颗粒具有斜方的钙钛矿结构。扫描电镜结果表明BiFeO3纳米粒子具有立方形貌。而TEM结构分析表明BiFeO3纳米颗粒具有完整的单畴结构;磁性分析表明纳米的BiFeO3颗粒具有弱的铁磁有序。制备的BiFeO3具有Fe-O键的伸缩振动和弯曲振动,证实了Fe-O八面体的存在以及BiFeO3具有钙钛矿结构。     

PbSe修饰TiO2纳米带复合材料的水热制备及其可见光催化活性

以Na2[PbCl4]络合物溶液、Na2SeSO3溶液和TiO2纳米带为前驱物,采用水热法简单制备了无桥联PbSe修饰TiO2纳米带复合材料,并对该材料进行了罗丹明B的可见光催化降解活性测试。各种测试结果表明,立方相PbSe呈纳米粒子状态沉积在锐钛矿型TiO2纳米带表面,其沉积量可通过重复合成次数在一定程度上得到控制,但对TiO2纳米带比表面积影响很小,PbSe修饰有利于对有机物降解的光催化作用;PbSe对TiO2纳米带修饰呈现出明显可见光吸收,对TiO2起到光敏化作用;可见光催化结果证实,PbSe修饰TiO2纳米带对罗丹明B光催化降解活性远比纯TiO2纳米带高出许多。     

表面活性剂对水热合成Gd_2O_3:Eu~(3+)性能的影响

以碳酸氢铵作为沉淀剂,分别以聚乙二醇-1000(PEG-1000)、十二烷基磺酸钠(DSASS)、十六烷基三甲基溴化铵(CTAB)、乙二醇(EG)为表面活性剂,采用水热法制得了棒状Gd2O3:Eu3+微晶。用XRD、SEM、荧光光谱仪等分别对样品的物相结构、微观形貌和发光性能进行了研究。结果表明:采用不同的表面活性剂所得前驱物经800℃下焙烧均得到了纯立方相的Gd2O3:Eu3+微晶,颗粒基本呈棒状,分散性较好,但长径比不同。以PEG-1000为表面活性剂所得样品尺寸不均一,尺寸分布范围较宽;以DSASS、CTAB、EG为表面活性剂所得样品直径较小、长度较短,且尺寸分布范围较窄。棒状Gd2O3:Eu3+微晶主发射峰位置均在613 nm,属于5D0→7F2跃迁,呈红光发射;激发光谱中电荷迁移态发生了红移,主激发峰位于261 nm。表面活性剂种类对发射峰和激发峰强度影响较大,由强到弱的顺序为:PEG-1000>DSASS>CTAB>EG。     

Syntheses and Crystal Structures of Co(Ⅱ)Complexes with 5-Tert-butyl Isophthalic Acid

<正>Two new Co(Ⅱ)coordination polymers {[Co(Htbip)_2(H_2O)_4]·(H_2O)}_n 1 and {[Co_2(tbip)_2(bpa)_(1.5)](H_2tbip)}_n 2(H_2tbip=5-tert-butyl isophthalic acid,bpa=1,2-dis(4-pyridyl) ethane)have been synthesized under hydrothermal conditions and characterized by elemental analysis,IR spectroscopy and X-ray diffraction.Compound 1 exhibits a water-bridged 1-D linear chain which is extended by hydrogen bonds into a 3D supramolecular network,while compound 2 has a dinuclear unit extended by bpa ligand to form a 2-D layer.     

Hydrothermal Synthesis and Structure of One New Polyoxotungsate [Ni(trien)]_4[Ni_4(H_2O)_2(HPW_9O_(34))_2]·4H_2O

One new sandwich-type tetra-nickel substituted polyoxotungsate,[Ni(trien)]4-[Ni4(H2O)2(HPW9O34)2]·4H2O(1,trien=triethylenetetramine),has been hydrothermally synthesized and characterized by IR,elemental analysis,TGA,and single-crystal X-ray diffraction analysis.Crystal data for 1:triclinic,space group P with a=13.279(3),b=13.816(3),c=14.494(4),α=95.403(1),β=113.173(4),γ=93.809(3)o,V=2418.0(10)3,Z=1 and Dc=3.861 g/cm3.X-ray crystallographic study shows that compound 1 is a relatively rare inorganic-organic hybrid polyoxo tungstate constructed from sandwich Ni-substituted polyoxo-anions and nickel complexes.