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1.
烷基、烷氧基取代聚噻吩发光材料的合成与性能   总被引:2,自引:0,他引:2  
报道了以无水FeCl3为催化剂合成烷基、烷氧基取代聚噻吩的实验过程,两种聚合物稀溶液和薄膜的光发射、光吸收性能和用这两种材料作发光层制作的发光二极管的光电性能的初步研究结果。两种聚合物均具有较高的纯度和分子量。两种材料均显示了较好的发光性能,其电致发光颜色均为红橙色。烷氧基取代聚噻吩均聚物电致发光性能的研究对聚噻吩类材料的应用开发具有实际意义。  相似文献   

2.
聚(3,4-乙撑二氧噻吩)的合成与应用   总被引:5,自引:0,他引:5  
介绍了聚(3, 4-乙撑二氧噻吩)(poly(3, 4-ethylenedioxythiophene) 简称为PEDT)的研究过程、性质特点、表征方法、应用情况及开发前景。通过聚苯乙烯磺酸(简称PSS)掺杂,解决了聚(3, 4-乙撑二氧噻吩)的加工问题,所得PEDT/PSS膜具有电导率高(10 S/cm),透明性好(在可见光范围内几乎是透明的)、机械强度较高,且有很好的抗水解性和光稳定性及热稳定性(在110~200℃的高温下能耐1 000 h以上,其膜电导率几乎不变),已在固体电解电容器等方面获得成功应用。  相似文献   

3.
导电聚合物BAYTRON及其在固体电解电容器上的应用   总被引:2,自引:0,他引:2  
介绍新一代导电聚合物-聚乙烯二氧噻吩(3,4-Polyethylene dioxythiophene,简称PEDT)的主要特点,分析了其对固体电解电容器等效串联电阻、高频特性等遥影响。PEDT将是今后开发新一代高频固体电解电 容器的重点研究领域。  相似文献   

4.
超级电容器的原理及应用   总被引:12,自引:0,他引:12  
作为一种介于传统电容器及电池之间的新型储能元件,超级电容器具有超大容量、高功率密度、长循环寿命、充放电效率高等特点,引起了世界广泛关注。综述了超级电容器的原理、分类及特点,介绍了超级电容器的主要应用领域和发展趋势。  相似文献   

5.
为了满足液晶光学器件快速响应的要求,采用有机合成方法获得了6种单氟取代苯基二苯乙炔基异硫氰酸酯类液晶化合物。首先用IR和1HNMR对6种单氟取代液晶化合物的结构进行了表征,其次通过差热分析对其相变温度进行了测试,利用液晶综合参数测试仪对其液晶性能进行了研究。红外和核磁图谱表明合成的化合物即为目标化合物;差热分析获知这些化合物90℃左右进入液晶相,并且氟取代位置在与异硫氰酸酯基相连苯环的2号位置时有相对较低的熔点,最低的熔点可达到83.4℃;液晶综合参数测试结果表明这6种化合物的Δn值为0.432~0.681,同时氟取代位置在与异硫氰酸酯基相连苯环的3号位置时有相对更佳的响应性能。这些化合物在制备快速响应液晶光学器件中可能会有潜在的应用价值。  相似文献   

6.
导电聚合物BAYTRON~R及其在固体电解电容器上的应用   总被引:4,自引:2,他引:4  
介绍新一代导电聚合物——聚乙烯二氧噻吩 (3,4- Polyethylene dioxythiophene,简称 PEDT)的主要特点 ,分析了其对固体电解电容器等效串联电阻、高频特性等性能的影响。PEDT将是今后开发新一代高频固体电解电容器的重点研究领域  相似文献   

7.
李楠  梁晓  唐洪 《液晶与显示》2015,30(4):559-565
以4-烷基苯甲酸、4-羟基苯甲醛及3-氟-4-氰基苯酚为原材料合成了4种侧向氟取代三环双酯氰基液晶化合物,通过核磁共振(NMR)、质谱(MS)、红外光谱(IR)等分析方法确定了其分子结构,并对上述化合物的相变温度、介电各向异性、光学各向异性进行了测试研究。结果表明,该类化合物在升温过程中均呈现向列相,且具有清亮点高、向列相范围宽、介电各向异性大、光学各向异性大的特点。  相似文献   

8.
鉴于石墨烯基复合材料在超级电容器领域广阔的应用前景,综合国内外相关文献,同时结合所在课题组的研究成果,对石墨烯同金属氧化物、导电聚合物以及其他碳材料所形成的二元及三元复合材料的制备方法,及其用作超级电容器电极材料所表现出的优良性能等方面的研究进展进行了综述,最后对石墨烯基复合材料的未来发展方向进行了展望。  相似文献   

9.
阐述了有机电子晶体取代苯基硫脲的意义,讨论了其合成制备、分子结构、介电和压电特性。  相似文献   

10.
以FeCl3为氧化剂,用化学氧化法制得了聚(3-甲基噻吩)粉末,此法操作简单且产量高。由此得到的活性物质与乙炔黑、偏氟乙烯-六氟丙烯共聚物(P(VDF-HFP))混合制成复合电极。按复合电极中的活性物质含量计算时,其单电极比容量可达260 F/g 。  相似文献   

11.
Recent progress in the fabrication and application of diverse spherical titania nanostructures, including mesoporous spheres, spherical flaky assemblies, and dendritic particles of variable diameter and monodispersity in size, is summarized in this article. Utilizing different synthesis strategies, spherical titania nanostructures with tailored polymorphs (including amorphous, anatase, rutile, brookite and TiO2‐B), particle sizes (from tens of nanometers to millimeters), monodispersity, porosity, and variable surface properties have been produced. Such spherical titania nanostructures show realized and potential applications in the areas of chromatographic separation, lithium‐ion batteries, dye‐sensitized solar cells, photocatalytic oxidation and water splitting, photoluminescence, electrorheological fluids, catalysis, gas sensing, and anticancer intracellular drug delivery. Gaining further understanding of both synthesis design and application of these materials will promote the commercialization of such spherical titania nanostructures in the future.  相似文献   

12.
Lognormal random fields with multiplicative spatial interaction are proposed for modeling radar image intensity. Two particular classes of two-dimensional (2-D) lognormal random fields are introduced: multiplicative autoregressive (MAR), and multiplicative Mnrkov random fields (MMRF). The MAR and MMRF models are formulated as invertible point-transformations of Gaussian autoregressive and Gaussian Markov random fields (GMRF) and therefore possess many desirable properties. Least squares and maximum likelihood estimates for random-field parameters are presented, a decision rule is developed for selecting model order and transformations to normality as well, and techniques for synthesizing 2-D lognormal random fields are provided. Several Seasat synthetic aperture radar (SAR) images were tested using the decision rule developed in this paper and using the Kolmogorov-Smirnov (K-S) goodness-of-fit test. With both tests they were found to possess a good fit to lognormal statistics. MAR and MMRF models were fit to Seasat SAR images, and then the models were used to generate synthetic images that closely resemble the original SAR images both visually and in their variograms. This demonstrates the generality and appropriateness of the MAR and MMRF models for radar imagery.  相似文献   

13.
Photocatalysis is considered to be a green and environment-friendly technology since it can convert solar energy into other types of chemical energies. Over the past several years, metal-organic frameworks (MOFs)-based photocatalysts have received remarkable research interest due to their unique morphology, high photocatalytic performance, good chemical stability, easy synthesis, and low cost. In this review, the synthetic strategies of developing MOFs-based photocatalysts are first introduced. Second, the recent progress in the fabrication of various types of MOFs composites photocatalysts is summarized. Third, the different applications including hydrogen evolution reaction, oxygen evolution reaction, overall water splitting, nitrogen reduction reaction, carbon dioxide reduction reaction as well as photodegradation of organic pollutants of MOFs-based photocatalysts are summed up. Finally, the challenges and some suggestions for the future development of MOFs- and their composites-based photocatalysts are also highlighted. It is expected that this report will help researchers to systematically devise and develop highly efficient photocatalysts based on MOFs and their composites.  相似文献   

14.
A bibliography on research work related to nullors and their applications in circuit analysis, synthesis and design, covering the period 1961–2000, is given.  相似文献   

15.
Bismuth (Bi), as a nontoxic and inexpensive diamagnetic heavy metal, has recently been utilized for the preparation of a variety of nanomaterials, such as nanoparticles, nanowires, nanotubes, nanosheets, etc., with a tunable bandgap, unique structure, excellent physicochemical properties, and compositional features for versatile properties, such as near-infrared absorbance, high X-ray attenuation coefficient, excellent photothermal conversion efficiency, and a long circulation half-life. These features have endowed mono-elemental Bi nanomaterials with desirable performances for electronics/optoelectronics, energy storage and conversion, catalysis, nonlinear photonics, sensors, biomedical applications, etc. This review summarizes the controlled synthesis of mono-elemental Bi nanomaterials with different shapes and sizes, highlights the state-of-the-art progress of the desired applications of mono-elemental Bi nanomaterials, and presents some personal insights on the challenges and future opportunities in this research area. It is hoped that the controllable manipulation techniques of Bi nanomaterials, along with their unique properties, can shed light on the next-generation devices based on Bi nanostructures and Bi-related nanomaterials.  相似文献   

16.
This paper reports β‐lactoglobulin amyloid protein fibrils directed synthesis of Titanium Dioxide (TiO2) hybrid nanowires. Protein fibrils act as templates to generate closely packed TiO2 nanoparticles on the surface of the fibrils using titanium (IV) bis (ammonium lactato) dihydroxide (TiBALDH) as precursor, resulting in the TiO2–coated amyloid hybrid nanowires. These amyloid fibrils also exhibit complexation with a luminescent water‐soluble semiconductive polythiophene (P3HT). TiO2 nanowires behave as electron acceptor while, P3HT as electron donor. In this way, amyloid‐TiO2 hybrid nanowires can serve in heterojunction photovoltaic devices. To demonstrate this, a photovoltaic active layer is prepared by spin coating the blended mixture of polythiophene‐coated fibrils and amyloid‐TiO2 hybrid nanowires. The current–voltage characteristics of these photovoltaic devices exhibit excellent fill factor of 0.53, photovoltaic current density of 3.97 mA·cm?2 and power conversion efficiency of 0.72%, highlighting a possible future role for amyloid‐based templates in donor–acceptor devices, organic electronics and hybrid solar cells.  相似文献   

17.
The development of novel materials to improve energy storage efficiencies is essential to satisfy ever‐increasing energy demands. MxSy (M = Cu, Ag, Au) and their composites offer opportunities and enormous prospects in energy storage due to their extraordinary electrochemical properties, which promote promising energy storage characteristics in terms of stability, energy and power density, lifetime, etc. Recent developments of MxSy (M = Cu, Ag, Au) and their composites with various morphologies have received considerable attention. Multidimensional morphologies of MxSy (M = Cu, Ag, Au) and their composites have enriched charge‐storage and electron‐transport abilities. This review provides a detailed account of the synthetic strategies based on sulfur sources (i.e., inorganic sulfur sources, organosulfur sources, and other sulfur sources), which dictate the morphologies of nanosized MxSy (M = Cu, Ag, Au) and their composites. Notably, nanostructured silver sulfide can be prepared from the bulk to nanoscale. Moreover, the electrochemical applications of these materials for lithium‐ion batteries, sodium‐ion batteries, lithium‐sulfur batteries, and supercapacitors are summarized. Finally, future perspectives on the development challenges and major opportunities for MxSy (M = Cu, Ag, Au) and their composites, which must be overcome to achieve further improvements in electrochemical performance are outlined.  相似文献   

18.
LB膜及其应用   总被引:1,自引:0,他引:1  
张佐兰  郑茳 《半导体光电》1991,12(2):168-171
本文介绍一种新型超薄有机膜的制备技术以及该薄膜在光电器件方面的应用。报导了光敏管的制作工艺和其主要特性。  相似文献   

19.
阐述了传感器的作用及在国民经济发展中占有的位置;介绍了利用陶瓷材料的功能制作的各种类型的陶瓷传感器及其应用.对湿度传感器、气体传感器、超声波传感器进行了市场预测.  相似文献   

20.
A series of low transition temperature and fast response chiral smectic C (SmC*) liquid crystals is designed and synthesized. The phase transition behaviors and electrooptical properties of the synthesized compounds are investigated and compared with reported values. The ferroelectric phase of the liquid crystals is characterized by means of differential scanning calorimetry, polarizing optical microscopy, wide‐angle X‐ray scattering (WAXS), and electrooptical measurements. The wide SmC* phase is achieved via the induction of achiral trisiloxane and a chiral methyl‐lateral substituent onto the terminuses of the molecules. The optimized packing arrangement model is studied based on the exceptionally high apparent tilt angles (≈41°) and smectic layer spacing observed using WAXS. A fast response time of 0.3 ms in an electric field of 10 V µm?1 provides an opportunity to use the synthesized materials for field‐sequential color liquid crystal displays (FSCLCDs). An FSCLCD sample cell is fabricated using the synthesized ferroelectric liquid crystals via a red (R), green (G), and blue (B) backlight. A color‐frame frequency of more than 500 Hz (i.e., a frame frequency more than 166 Hz) is achieved. As a single material liquid crystal display cell, the synthesized ferroelectric liquid crystals show great performances at room temperature.  相似文献   

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