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1.
八—4—(四氢糠氧基)双酞菁钕LB膜的电子吸收光谱和扫描隧道显微镜形貌分析 总被引:1,自引:0,他引:1
测定了八-4-(四氢糠氧基)双酞菁钕在亚相水面上的π-A曲线,在石英和高取向热解石墨(HOPG)基底上制备了它的LB膜,解释了八-4-(四氢糠氧基)双酞菁钕的UV-Vis谱带.并采用扫描隧道显微镜方法观察了LB膜的形貌,发现在HOPG上双酞菁钕分子是随机分布并有多聚体形成而在HOPG上修饰一层硬脂酸后可得到均匀有序单分散的双酞菁钕分布.所有结果表明大环分子垂直于基底排列 相似文献
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酞菁铜(Ⅱ)衍生物的合成及其成膜性 总被引:5,自引:1,他引:5
合成了四-4-(8-喹啉氧基)酞菁铜(Ⅱ)等6种新型酞菁铜衍生物,通过元素分析、红外光谱、顺磁共振、质谱及核磁共振谱加以确认。紫外可见光谱表明它们在氯仿溶液(10^-5mol/L)中主要以单分子形式存在,配合物的氯仿溶液在亚相(水)上的π-A曲线表明,它们均有明显的“气-液-固”变化过程,具有良好的形成LB膜性质。 相似文献
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用红外光谱、紫外可见光谱、循环伏安法等研究了三(2,4-二特戊苯氧基)-8-喹啉氧基酞菁铜和2-十八烷基-7,7,8,8-四氰二基苯醌在Langmuir-Blodgett(LB)膜中的电荷转移。实验结果表明,在交替和混合LB膜中,酞 菁铜和C18-TC-NQ分子之间均发生了电荷转移,其中酞菁铜为给体分子,TCNQ为受体分子。在混合LB膜中,电葆转移程度较大。电导率测量表明荷移反应使LB膜的电导率较 相似文献
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含光功能基团聚合物LB膜的研究进展 总被引:4,自引:0,他引:4
本文在简要介绍含光功能基团聚合物LB膜之后,详细回顾了功能化LB膜体系光物理过程的研究,总结了含非线性光学基团聚合物LB膜的研究现状。最后,简要介绍了它们的应用前景。 相似文献
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纯Y型硬脂酸铅LB膜的制备及结构表征 总被引:1,自引:0,他引:1
纯Y型硬脂酸铅LB膜的制备及结构表征陈海燕,彭笑刚,于连香,周勇亮,姜月顺,李铁津(吉林大学化学系,长春,130023)徐跃,高忠民,魏诠(吉林大学测试中心)关键词硬脂酸铅,LB膜转移,硫化铅单层膜在脂肪酸盐LB膜的沉积过程中,存在由Y型向X型沉积的... 相似文献
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《Supramolecular Science》1998,5(3-4):363-365
Electron beam lithography was investigated using a cross-linkable polymer Langmuir–Blodgett (LB) film. Cross-linking reaction occurs in the LB film with electron beam irradiation as well as UV light irradiation and the irradiated LB film becomes insoluble in the organic solvents to form a two-dimensional network in the LB film. The sensitivity and contrast of the cross-linkable polymer LB film are 3 μC cm-2 and 0.64, respectively. The limiting resolution of patterning is 0.2 μm line-and-space. The electron beam lithography using the cross-linkable polymer LB film is applicable to the future nanotechnology. 相似文献
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Adopting LB film method, an arachidic acid (AA)/PEDOT multilayer LB film and polymerized EDOT monomers in hydrophilic group of LB were chosen to prepare the arachidic acid (AA)/PEDOT multilayer LB film. UV-Vis, FT-IR and XPS analyses implied that EDOT was effectively polymerized in film, and thus PEDOT conducting polymer was produced. Analyses of XRR and SIMS indicated that the film had a well-arranged lamella structure, and further research showed that polymerization of EDOT in AA film destroyed the orderliness of the original LB film. This phenomenon could be related to the destructive effect of polymerization on the layered structure. We used four-point probe and semiconductor instrument to study the conductivity property of the film, and observed that the conductivity of AA/PEDOT film had sudden changes with the changes of processing time in an effective conduction network, which was caused by "permeability" in conducting channel of multilayer film. The test results also indicated that the conductivity of AA/PEDOT film was obviously better than that of spin-coating PEDOT/PSS or ODA-SA/PEDOT-PSS film due to the higher π structure of PEDOT structure and ordered film structure. 相似文献
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Matsui J Yoshida S Mikayama T Aoki A Miyashita T 《Langmuir : the ACS journal of surfaces and colloids》2005,21(12):5343-5348
Semiconducting thin films consisting of regioregular poly(3-hexylthiophene) (RR-PHT) and poly(N-dodecylacrylamide) (pDDA) were constructed by the Langmuir-Blodgett (LB) technique. A mixture of RR-PHT and pDDA spread from a chloroform solution on a water surface forms a stable monolayer, which can be transferred onto solid substrates by the LB method, yielding a well-defined polymer LB film. Surface morphology studies of the LB film indicate that the RR-PHT is dispersed uniformly throughout the surface. The polymer thin film was chemically doped by contacting with FeCl3 acetonitrile solution, and a conductivity of 5.6 S/cm was achieved. Further, the LB film was utilized as the semiconducting film in the field-effect transistor (FET), and mobilities of 2.2 x 10(-4) and 4.4 x 10(-4) cm2 V(-1) s(-1) were obtained by analyzing the saturated and linear regions of the current-voltage characteristic, respectively. 相似文献
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Matsui J Sato Y Mikayama T Miyashita T 《Langmuir : the ACS journal of surfaces and colloids》2007,23(16):8602-8606
We fabricated an efficient organic electrochemical transistor (OECT) composed of polymer Langmuir-Blodgett (LB) film. The pi-conjugated polymer LB film, which was constructed from a poly(N-dodecylacrylamide) (pDDA) and poly(3-hexylthiophene) (PHT) mixture, was used as a conduction channel layer to connect source and drain electrodes. The mixed-polymer LB film was characterized using UV-vis spectroscopy, X-ray diffraction (XRD), atomic force microscopy (AFM), and cyclic voltammetry. Subsequent UV spectra measurements, XRD measurements, and AFM measurements show that PHT forms a crystalline lamellar domain in the layered structure of pDDA. The OECT included 10 layers of the mixed-polymer LB film as the conduction channel layer. The OECT showed an on/off ratio of 1.1x10(4) and mobility of 7.5x10(-2) cm2 V(-1) s(-1) at low gate (VG=-1.2 V) and source-drain voltages (VDS=-0.5 V). Moreover, the necessary charge to operate the OECT was 1.1x10(-9) mol of e(-1) cm(-2), which was 2 orders smaller than the value reported using a similar device structure. The relatively high on/off ratio and low charge consumption suggest that this OECT, which is fabricated from pi-conjugated polymer LB films, is applicable to macroelectronic devices. 相似文献
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含偶氮生色团的“倒浮萍”聚合物LB膜及其可逆光信息存储特性 总被引:1,自引:0,他引:1
含偶氮苯功能基团的聚合物在光电子器件研制中具有诱人的应用前景.Wendorff[1]利用偶氮液晶聚合物首次实现可逆的光学信息存储后,利用偶氮苯分子的激光诱导二向色性和双折射效应实现可逆光学信息存储引起人们极大的兴趣.与传统的利用偶氮苯的顺反异构体实现信息存储的方式相比,这种信息存储方式由于偶氯苯分子始终处于热力学稳定的反式构象,因而具有突出的长期稳定性,具有更广阔的应用前景[1,2].本工作设计合成了以含有给受体的偶氮苯分子为接枝侧链的两亲性聚合物,并研究了其成膜特性与可逆光信息存储特性.1实验部分两亲性聚合物… 相似文献
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Adopting LB film method, an arachidic acid (AA)/PEDOT multilayer LB film was chosen, and polymerized EDOT monomers in hydrophilic group of LB to prepare arachidic acid (AA)/PEDOT multilayer LB film. UV‐Vis, FT‐IR and XPS analyses implied that EDOT was effectively polymerized in film, and thus PEDOT conducting polymer was produced. Analyses of XRR and SIMS indicated that film had a well‐arranged lamella structure, and further research showed that polymerization of EDOT in AA film destroyed the orderliness of the original LB film. This phenomenon could be related to the destructive effect of polymerization on layered structure. We used four‐point probe and semiconductor instrument to study the conductivity property of the film, and observed that the conductivity of AA/PEDOT film had sudden changes with the processing time of changes in effective conduction network. That was caused by "permeability" in conducting channel of multilayer film. The test results also indicated that the conductivity of AA/PEDOT film was obviously better than that of spin‐coating PEDOT/PSS film or that of ODA‐SA/PEDOT‐PSS film, which was due to the higher π structure of PEDOT structure and ordered film structure. 相似文献
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Sawant SN Doble M Yakhmi JV Kulshreshtha SK Miyazaki A Enoki T 《The journal of physical chemistry. B》2006,110(48):24530-24540
Langmuir-Blodgett (LB) films of the water-soluble dye phenosafranine (PS) have been prepared by its adsorption from aqueous dye solution to an arachidic acid (AA) monolayer at the air-water interface. Atomic force microscopy (AFM) images of the LB films revealed the effect of change in pH of deposition on the degree of complexation of AA with the PS dye. Well-defined circular islands and holes were observed which disappeared with the increase in pH. Polarized absorption studies indicated that the dye molecules are oriented uniaxially with their long axis titled at a constant angle to the surface normal of the LB film. Within the restricted geometry of the LB film, the PS dye was electropolymerized to form a two-dimensional film of poly(phenosafranine) sandwiched between arachidic acid layers. The film was characterized by IR spectroscopy, cyclic voltammetry, and AFM. X-ray diffraction studies reveal the presence of a layer structure in the AA-PS LB film before and after polymerization. The polymer film showed highly anisotropic electrical conductivity of ca. 10 orders of magnitude. This indicates the formation of two-dimensional polyPS layers between arachidic acid layers resulting in a layered heterostructure film having alternate conducting and insulating regions. Also, the conductivity of the polyPS prepared from LB film was found to be approximately 2.5 times higher than the conductivity of polyPS prepared by solution polymerization method. 相似文献
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倒浮萍聚合物ES-3LB膜掠角反射-吸收红外光谱的研究 总被引:1,自引:0,他引:1
用傅里叶变换红外掠角反射-吸收光谱技术对ES-3LB膜的取向和相变行为进行了详细的研究.结果表明,在金表面上制备的ES-3LB膜中烷基链基本垂直于基面.相转变行为的研究表明,ES-3LB膜有3个相变点,分别在65,105和140℃.第一个相变过程表现为LB膜从一种有序状态到另一种有序状态的转变;第二个相变过程表现为LB膜中烷基链的有序-无序转变;第三个相变过程是LB膜的层状结构坍塌转变为各向同性熔融体的过程. 相似文献
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Langmuir–Blodgett (LB) films were prepared from poly(methylphenylsilane) bearing electron acceptor π-conjugated substituents. The small limiting area (0.078 nm2) per one repeating unit of polysilane (PSi) in monomolecular film and the large thickness of the film (6 nm) suggest that the polymer chains are not fully spread on water surface. The electrical and photoelectrical properties of Al/LB film/Au sandwich cells containing various numbers of the polysilane layers were studied. Holes were transported from the Al electrode through the LB film to the Au electrode when the light was absorbed by the polysilane. The highest photovoltaic effect occurred in the first monolayer of polysilane at the Al contact. The cell resistivity and the photovoltage were decreased by parallel conductance of defects in the films consisting of small numbers of PSi layers. 相似文献
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Constantino CJ Aroca RF Mendonça CR Mello SV Balogh DT Oliveira ON 《Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy》2001,57(2):281-289
The spectroscopic properties and surface-enhanced spectra of Langmuir-Blodgett (LB) films of methacrylic homopolymer (HPDR13) are presented. It is shown that LB film displays strong fluorescence attributed to the spatial restrictions imposed by its structure. The emission is observed in conjunction with photoisomerization, a process clearly demonstrated by the formation of surface-relief gratings in the LB film [C.R. Mendon?a et al., Macromolecules 32 (1999) 1493]. Surface-enhanced Raman scattering (SERS), Surface-enhanced resonance Raman scattering (SERRS) and surface-enhanced fluorescence (SEF) were observed for LB films of HPDR13 deposited onto silver island films. SERS measurements were also carried out on a sample fabricated with one monolayer LB film deposited onto silver islands followed by one overlayer of silver (LB sandwiched between two layers of silver islands). The polymer interacts very weakly with the metal surface (physisorption), and the enhancement effect is determined by the local electric field enhancement. The strong SERS and SERRS signals were suitable for micro-Raman imaging. Line, area mapping and global images of the LB monolayer on silver island are reported. The transfer ratio in the fabrication of the LB suggests a homogeneous coating of the silver islands, thereby the chemical images show the variation of the SERS intensity due to surface enhancement. 相似文献