共查询到19条相似文献,搜索用时 49 毫秒
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利用LB薄膜技术在一定尺寸的钾离子交换玻璃波导上制备了30层四—4—(2、4—二特戊基苯氧基)酞菁铜(简称tapCuPc)Z型LB薄膜,形成覆盖有LB薄膜的四层介质波导.首次报道在室温下采用不同激光脉冲观察覆盖有LB薄膜的光波导片上的光学双稳特性,除去LB薄膜覆盖层后没有观察到光双稳特征. 相似文献
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利用LB技术,以二十碳酸作辅助成膜材料,在疏水处理的P-Si上分别制备了2、4、6、10和20层聚乙烯咔唑(PVK)超分子膜。对这种体系的表面光电压谱(SPS)研究结果表明,表面光电压随PVK膜层数的增加而增强,在紫外区增强较为明显。随着膜层数的增加,表面光电压有趋于饱和的趋势。膜对基底的敏化主要是由于PVK的光导电性引起的。 相似文献
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酞菁铜固态薄膜的红外光谱 总被引:2,自引:0,他引:2
利用红外透射光谱,偏振透射光谱、掠角反射光谱研究了三-2,4-二特戊基苯氧基8-喹啉氧基酞菁铜LB膜和蒸镀膜的结构。确认在LB膜中,(1)取代基的碳链是以六方晶系或假六方晶系方式堆积的;(2)用偏振红外可以区别苯环上的两个CH2的伸缩振动带。在蒸镀膜中分子基本呈现无序状态。 相似文献
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LB薄膜中四新戊氧基酞菁锌和四壬基酞菁铜分子聚集体的吸收光谱的温度特性 总被引:1,自引:2,他引:1
本文制备了四新戊氧基酞菁锌(Tetra-neopentoxy phthalocyanine zine)(TNPPeZn)和四壬基酞菁铜(Tetra-nonyl phthalocyanine copper)(TNPeCu)两种酞菁衍生物的Langmuir-Blodgett(LB)薄膜.通过测量10~473K温度下的吸收光谱,研究了两种薄膜的分子聚集状态.TNPPeZn的LB薄膜中,存在着分子单体和分子二聚体,在吸收光谱中分别表现为680nm和620nm的吸收峰.随着温度的升高,分子单体逐渐转变为分子二聚体,这个过程是不可逆的.TNPeCu的LB薄膜中,除了分子单体和分子二聚体以外,还有吸收为740nm的分子J聚集体存在.随着温度的变化,J聚集体发生可逆变化. 相似文献
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利用LB技术,以二十碳酸作辅助成膜材料,在疏水处理的p-Si上分别制备了2,4,6,10和20层聚乙烯咔唑超分子膜。对这种体系的表面光电压谱研究结果表明,表面光电压随PVK膜层数的增加而增强,在紫外区增强较为明显。随着膜层数的增加,表面光电压有趋于饱和的趋势。膜对基底的敏化主要是由于PVK的光导电性引起的。 相似文献
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通过对新型的染料LB膜(花氰-花生酸复合LB膜)的吸收光谱的测试,说明了LB膜中染料分子H-聚体结构的存在,而在立体简并四波混频实验中观察到这种LB膜具有可逆的光学记录与擦除效应,实验表明,在其中建立一个稳定的光栅,所用的记录光脉冲强度为30MW/cm~2,需要的累积记录时间为80ns(10个脉冲).最后在简化的三能级系统中,以分子处于各态的布居光栅模型说明了光致H-聚体,单体之间的转化是这种光学记录效应的主要原因. 相似文献
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研究了两种不对称取代萘酞菁化合物LB膜的制备,并采用线性吸收谱研究了萘酞菁化合物在溶液和LB膜中的聚集特性。三叔丁基萘酞菁和三叔丁基氰基萘酞菁两种化合物均能制备成很好的LB膜,它们在溶液和LB膜中也均能形成H-聚集体,但在溶液中主要是以单体的形式存在,而在LB膜中则主要是以聚集体的形式存在。两种化合物是倾斜的站立在亚相表面上,但由于氰基的作用,使三叔丁基氰基萘酞菁的倾角较小,几乎是直立在亚相表面上。 相似文献
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利用光谱扩展的荧光型软X射线单色光源产生的多条谱线,通过时间递增和光强递增的方法首次标定了国产高速航空胶片在软X射线和超软X射线波段的响应特性,给出了这种胶片的响应特性曲线即光学密度与曝光量的关系和相对光谱灵敏度曲线. 相似文献
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用络合转化法在甲壳胺膜上制备CdS、ZnS纳米微粒 总被引:8,自引:0,他引:8
结构单元上带有配位基团的天然高分子甲壳胺与Cd2+和Zn2+络合后,通过络合转化方法可以在高分子膜上制备CdS、ZnS等纳米微粒。用这种方法所得微粒尺寸可控、粒径均一、表面缺陷少。 相似文献
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S.A. Vanalakar M.P. Suryawanshi S.S. Mali A.V. Moholkar J.Y. Kim P.S. Patil J.H. Kim 《Current Applied Physics》2014,14(12):1669-1676
This study reports on the formation of cadmium sulfide (CdS) nanostructures with controlled morphology synthesized via a simple chemical route in surface active agent environment. The effect of organic surface active agents (surfactants) as sodium dodecyl sulfate (SDS), polyethylene glycol (PEG) and cetyltrimethylammonium bromide (CTAB) on structural, morphological, optical and photoelectrochemical properties of CdS thin films have been studied. Our results reveal that the organic surfactants play key roles in tweaking the surface morphology. A compact spongy ball like morphology was observed for the CdS samples grown without organic surfactants. The cauliflower's with nanopetals from the CTAB, whereas crowded star fish like morphology is observed in PEG-mediated growth. Water hyacinth like morphology is tweaked using SDS. Considering the importance of these nanostructures, the growth mechanism has been discussed in details. Additionally, the samples are photoelectrochemically (PEC) active and having a compact surface with a nanoporous structure twig helps in improved photoelectrochemical performance compared to that of CdS deposits from surfactant free solution. This is a simplistic way to tune the morphology using surfactants, which can be applied to other energy conversion applications. 相似文献
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Core–shell CdS/ZnS nanoparticles in arachidic acid film were prepared through a novel Langmuir–Blodgett (LB) approach. Post-deposition treatment of the precursor LB multilayers of cadmium arachidate with H2S gas followed by intercalation of Zn2+ ions and further sulfidation result in the formation of CdS/ZnS nanoparticles in the LB film. The formation of these nanoparticles and resulting changes in layered structures were studied by FTIR and X-ray reflection measurements. The optical properties were studied using UV–vis absorption and photoluminescence spectroscopy. A red-shift in the absorption spectrum and enhancement of CdS excitonic emission together with reduction of surface states emission suggest that after the intercalation step, a thin layer of ZnS surrounds the CdS nanoparticles, thus forming a core–shell structure. Subsequent to the second sulfidation, a further red-shift in absorption suggests the formation of a thicker ZnS coating on CdS. Electron diffraction of CdS nanoparticles coated with thicker ZnS showed the diffraction patterns of only ZnS, as expected for core–shell structures. 相似文献
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Cadmium sulfide (CdS) nanoparticles, with different Cd/S molar ratios, were chemically produced and characterized in this study. High quality CdS nanoparticles were grown in the hexagonal phase, as indicated by X-ray diffraction data and Raman spectroscopy. Photoluminescence was used to investigate the surface effects caused by submitting the nanoparticle-based samples at different laser treatments and vacuum pressure. 相似文献
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Cadmium sulphide (CdS) thin film was prepared by successive ion layer adsorption and reaction (SILAR) technique using ammonium sulphide as anionic precursor. Characterization techniques of XRD, SEM, TEM, FTIR and EDX were utilized to study the microstructure of the films. Structural characterization by x-ray diffraction reveals the polycrystalline nature of the films. Cubic structure is revealed from X-ray diffraction and selected area diffraction (SAD) patterns. The particle size estimated using X-ray line broadening method is approximately 7 nm. Instrumental broadening was taken into account while particle size estimation. TEM shows CdS nanoparticles in the range 5–15 nm. Elemental mapping using EFTEM reveals good stoichiometric composition of CdS. Characteristic stretching vibration mode of CdS was observed in the absorption band of FTIR spectrum. Optical absorption study exhibits a distinct blue shift in band gap energy value of about 2.56 eV which confirms the size quantization. 相似文献
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纳米尺寸CdS半导体微晶的光致发光线宽宽化研究 总被引:2,自引:1,他引:1
测量了各种温度下玻璃中掺杂纳米尺寸CdS半导体微晶的光致发光光谱,研究了其光致发光带的峰值能量和线宽对温度的依赖关系.考虑CdS微晶的LO声子的相互作用,拟合了其带隙发光带的线宽随温度的变化曲线,获得样品的非均匀线宽.CdS微晶的非均匀线宽主要是由于微晶的尺寸分布引起的. 相似文献