Fast Liquid Phase Epitaxial Growth for Perovskite Single Crystals

Semiconductors grown by the solution-processed method have shown low-cost,facile fabrication process and comparable performance.However,there are many reasons why it is difficult to achieve high quality films.For example,lattice constant mismatch is one of the problems when photovoltaic devices made of organ metallic perovskites.In this work,MAPbBr^{MA=CH3NH3^+}perovskites single crystals grown on the surface of MAPbBr2.5 CI0.5 perovskites single crystals via liquid epitaxial growth method is demonstrated.It is found that when the lattice constants of the two perovskite single crystals are matched,another crystal can be grown on the surface of one crystal by epitaxial growth.The whole epitaxy growth process does not require high heating temperature and long heating time.X-ray diffraction method is used to prove the lattice plane of the substrate and the epitaxial grown layer.A scanning electron microscope is used to measure the thickness of the epitaxial layer.Compared with perovskite-based photodetectors without epitaxial growth layer,perovskite-based photodetectors with epitaxial growth layer have lower dark current density and higher optical responsibility.     

类真体——对企业本体论的认知

对"企业是什么"的探讨产生了诸多企业理论的研究学派,但这些理论只解释了企业的一些片段,未能认知企业本体.因此引入人工智能Agent的概念,认为企业是以计算经济盈亏为主要特征的类真体,并提出"本真体"和"实真体"的概念,与类真体构成了现代企业本体认知的基本概念体系,来证明将人工智能理论和方法引入企业理论的逻辑合理性,以期许解决企业理论的本原问题.     

Novel Copper（Ⅱ） and Zinc（Ⅱ） 2-D Supramolecular Structures Based on Carboxylate and 1-Substitutedimidazole Mixed-ligands

Using the ligand bis(3-(1H-imidazol-1-yl)-1-phenylpropan-1-one) L, two novel com- plexes [CuL2(ph))]·H2O 1 and [ZnL2(tp)] 2 (ph = phthalic acid, tp = terephthalic acid) have been synthesized and their crystal structures were determined by single-crystal X-ray diffraction analysis. Crystal data for 1: triclinic, space group P1, a = 9.4300(17), b = 12.148(2), c = 13.721(2) , α = 109.620(2), β = 94.351(2), γ = 94.830(2)°, C32H30N4O7Cu, Mr = 646.14, V = 1466.2(4) 3, Z = 2, Dc = 1.464 g/cm3, μ(MoKα) = 0.801 mm-1, F(000) = 670, the final R = 0.0337 and wR = 0.0859 for 5122 observed reflections with I > 2σ(I). And those for 2: monoclinic, space group P2/n, a = 7.1866(11), b = 14.144(2), c = 14.407(2) , β = 101.427(2)°, C32H28N4O6Zn, Mr = 629.95, V = 1435.4(4) 3, Z = 2, Dc = 1.457 g/cm3, μ(MoKα) = 0.908 mm-1, F(000) = 652, the final R = 0.0438 and wR = 0.0821 for 2546 observed reflections with I > 2σ(I). In 1 and 2, ph or tp ligands bridge the six-coordinated copper(II) or four-coordinated zinc(II) ions forming 1D zigzag chains while L ligands act as the terminal monodentate ligand. It is noted that weak non-classical C–H···O plays the important and dominating roles in the formation of 2D supramolecular architectures of 1, but in 2 non-classical C–H···O and aromatic π-π stacking interactions are quite important and play dominant roles in the self-assembly of 2D supramolecular architectures.     

光固化3D打印技术及光敏树脂的开发与应用

光固化3D打印技术因速度快、精度高、环境友好等优势,已成为一类广泛应用的快速成型工艺.光敏树脂作为光固化3D打印的主体材料,对器件的性能与应用有着决定性影响.本文先介绍了几种已普及和新开发的光固化3D打印成型原理;并对光敏树脂的组成、分子结构和器件性能间的构-效关系进行了分析;进而对光固化3D打印及树脂的应用进行分类介...     

高效液相色谱法分离检测8-羟基喹啉和8-羟基喹啉铜

1　引　　言8 羟基喹啉铜 [Cu(HQ) 2 ]是一种杀菌剂 ,用于防治作物的丝核菌及木材的防腐或用于棉布、皮革、油毛毡等的杀菌。它的纯度分析一直是该杀菌剂开发的重要工作之一。JosephA .Akkara等试图用高效液相色谱法和气相色谱法直接测定[Cu(HQ) 2 ]均未获成功。目前 [Cu(HQ) 2 ]的含量测定多采用化学法 ,该法实际得到的是总铜量 ,由此推算 [Cu(HQ) 2 ]含量有一定误差。本文采用高效液相色谱法同时分离、测定 [Cu(HQ) 2 ]及 8 羟基喹啉 (HQ)。有关这方面的研究 ,国内外尚未见报道。该方法简便、可行 ,结果令人满意。2　实验部分2 .1…     

硬度离子敏感场效应传感器的研制

在4.0×10~(-6)M 3,5-Cl_2-DMPAP_(-2.0％)NH_2OH.CI-0.40M NH_3.H_2O底液中,用单扫描示波极谱仪可获得Co-3,5-CI_2-DMPAP配合物-灵敏的极谱波。该波的峰电位为-o.70V(S.C.E.),导数波高与钻浓度在0.80PPb-9.6PPb范围内呈线性关系,检测下限可达0.4PPb。该法应用于VB_(12)中痕量钻的测定,结果满意.     

除草剂2-甲基-4-氯苯氧乙酸的离子色谱分离荧光检测

介绍了离子色谱荧光检测除草剂2_甲基_4_氯苯氧乙酸 (简称2甲4氯 )的方法 ,2甲4氯溶液在流速为1.5mL·min -1,淋洗液为0.1mol·L -1Na2CO3-0.1mol·L -1NaHCO3 混合溶液 ,荧光检测器的激发波长为284.9nm ,发射波长为314.5nm的条件下 ,能得到较好的分离和检测 ;在该条件下 ,2甲4氯具有良好的线性关系和重复性 ,检出限为0.093mg·L -1,对土壤样品进行检测 ,回收率98 %～103 %。     

酰胺基团对Gemini表面活性剂表面活性和聚集行为的影响

本文合成了含酰胺基团和不含酰胺基团的两类Gemini阳离子表面活性剂,测定了其表面活性参数,研究了酰胺基团对表面活性剂的表面活性和聚集行为的影响。结果表明,酰胺基团提高了Gemini阳离子表面活性剂的临界胶团浓度,降低了胶团聚集数,增强了胶团微极性,增大了表面活性剂的饱和吸附量。