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在甲醇和二氯甲烷的混合溶剂中合成了2个新的铜(Ⅰ)配合物:[Cu(dppp)(Bphen)]Cl·1.8CH3OH(1)和[Cu2(CN)2(dppp)(dmp)2]·2.5CH3OH(2)(dppp=1,3-双(二苯基膦基)丙烷,Bphen=4,7-二苯基-1,10-菲咯啉,dmp=2,9-二甲基-1,10-菲咯啉),并通过X射线单晶衍射、元素分析、红外光谱、核磁共振氢谱及磷谱、荧光光谱和太赫兹时域光谱对2个配合物进行了分析和表征。单晶结构表明配合物1是以Cu(Ⅰ)为中心,Bphen和dppp为配体,螯合形成的扭曲四面体结构。配合物2则是由CuCN、dppp和dmp以2:1:2的比例混合得到。配合物2的双膦配体的2个膦基分别与2个Cu(Ⅰ)形成配位键,每个Cu(Ⅰ)又分别与1个氰根和1个dmp配位。发光光谱表明配合物1和2所有的发射峰来源于金属-配体电荷迁移(MLCT)。太赫兹时域光谱对配合物1和2的研究提供了帮助。 相似文献
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Novel graphene enhancement nanolaser based on hybrid plasmonic waveguides at optical communication wavelength 下载免费PDF全文
Surface plasmon polariton(SPP) nanolaser, which can achieve an all-optical circuit, is a major research topic in the field of micro light source. In this study, we examine a novel SPP graphene nanolaser in an optoelectronic integration field.The proposed nanolaser consists of metallic silver, two-dimensional(2 D) graphene and high refractive index semiconductor of indium gallium arsenide phosphorus. Compared with other metals, Ag can reduce the threshold and propagation loss.The SPP field, excited by coupling Ag and InGaAsP, can be enhanced by the 2 D material of graphene. In the proposed nanolaser, the maximum value of propagation loss is approximately 0.055 d B/μm, and the normalized mode area is constantly less than 0.05, and the best threshold can achieve 3380 cm~(-1) simultaneously. Meanwhile, the proposed nanolaser can be fabricated by conventional materials and work in optical communication(1550 nm), which can be easily achieved with current nanotechnology. It is also an important method that will be used to overcome the challenges of high speed,miniaturization, and integration in optoelectronic integrated technology. 相似文献
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光催化剂在工业废水处理中发挥着重要作用. 本工作以室温下一步合成的片状铁基金属有机凝胶(Fe-based Metal-organic gel, Fe-MOG)为前驱体, 在不同温度下煅烧得到了片状(300-Fe2O3和400-Fe2O3)和球形(500-Fe2O3和600-Fe2O3)两种形貌的衍生三氧化二铁(Fe2O3). 通过一系列测试手段对衍生Fe2O3的晶体结构和光电性能进行了表征. 其中, 具有碳骨架结构的400-Fe2O3因其优良的电子传输性能和较高的光生电荷分离效率表现出优异的光催化活性, 可在中性条件下60 min内光降解97.5%的罗丹明B (Rh B), 并且在连续五次循环实验后其降解效率仍能达到85.3%. 本工作为开发和设计具有优异催化活性的半导体光催化剂提供了新的思路. 相似文献
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Three-Level Safety Evaluation of Suspended Sections of Underwater Buried Pipelines北大核心CSCD 下载免费PDF全文
The uneven riverbed, and the impact and scour actions by water flow, make the underwater buried pipeline vulnerable to exposure and suspension, and endanger the pipeline operation safety. To investigate the mechanical properties and failure behaviors of the suspended pipeline section under water impact, according to the failure mechanism of the pipeline, the statics and dynamics analyses of the pipeline were carried out, and the graded safety evaluation technique for the buried pipeline with suspended sections was presented. First, a “static strength safety evaluation under static loads” (level 1) was conducted according to the mechanical features and stress states of the pipeline’s suspended section. Second, a “resonance safety evaluation under dynamic loads” (level 2) was conducted based on the correlation between the natural vibration frequencies of the suspended pipeline and the vortex emission frequencies of water flow. Finally, the periodical change process of the pipeline’s alternating stress was studied to solve the fatigue damage and fatigue life of the pipeline, and the “fatigue strength safety evaluation under dynamic loads” (level 3) was performed. Thus, a 3-level safety assessment procedure for pipelines with suspended sections was proposed. The stabilizing measures for pipelines of poor safety were suggested, and through an example, a specific calculation process was provided. The work serves as a theoretical guide for the safety evaluation of the suspended sections of underwater buried pipelines. © 2023 Editorial Office of Applied Mathematics and Mechanics. All rights reserved. 相似文献
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随着现代社会智能化的加速发展,传感系统中传感器的数量、密度和分布范围不断增加,传统的供能方式难以满足如此复杂多变的传感器供能需求,从周围环境中收集能量并转化为电能的自供能传感器件是解决这一难题的有效途径。石墨烯不仅具有优异的传感性能,而且在各种能源器件中有广泛的应用,这为基于石墨烯的自供能传感器件设计提供了便利。近年来,人们已经研究和发展了多种多样的石墨烯自供能传感器件。本文基于自供能器件的基本能量供给原理,包括电化学供能、光伏供能、摩擦电供能、水伏供能以及热电、压电、热释电等其它供能,分别介绍了石墨烯在自供能传感器件中的应用,并展望了基于石墨烯的自供能传感器件的未来发展、挑战和前景。 相似文献
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本文系统的探讨了1,3,5-丙二酸衍生物取代基(2-5),戊烷-2,4-二酮取代基(6),3,5-二甲基-1H-吡唑取代基-2,4,6-三乙基苯(7)的合成和结构。1H NMR分析表明,这些化合物在溶液中具有高度的对称性;X-单晶衍射分析确认这些化合物在固态均采取1,3,5-交替构象,即三个功能取代基团处在中心苯环平面的一边,而三个乙基则位于该中心苯环平面的另一边。分子内和分子间氢键是化合物4,5,7实现超分子自组装的主要作用力。化合物7(L)的吡唑取代基与铜离子(II)通过Cu-N的配位键作用形成笼状配合物8 (Cu3L2),在配合物8中,两配体分子7(L)采取了顺式面面相向的构象。 相似文献
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