共查询到18条相似文献,搜索用时 741 毫秒
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提出了一种利用重氮偶合方法合成主链偶氮聚合物的新方法,合成了一种主链含有假芪型偶氮生色团的聚合物.对合成聚合物的结构、热性能以及光响应性能进行了详细表征.在线偏振激光的作用下,聚合物膜中的偶氮苯生色团发生光致取向,用偏振紫外-可见光光谱测量了此聚合物膜的二向色性,得到聚合物膜的取向有序度为0.03.用波长为488 nm,能量密度为150 mW/cm2的相干Ar+激光对聚合物膜照射1000 s,得到形貌规整的正弦波形表面起伏光栅,光栅的周期为900 nm,起伏深度为89 nm. 相似文献
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通过后重氮偶合的方法合成了一种含支化侧链偶氮苯生色团的聚电解质 (PBANT AC) .用IR、NMR、DSC、UV和元素分析等手段对聚合物的结构和性能进行了表征 .研究发现 ,在不同比例的水和四氢呋喃混合溶剂中PBANT AC的紫外 可见光光谱有很大的差别 .这种差别反映了PBANT AC分子中的偶氮苯生色团的不同聚集状态 .通过静电吸附逐层自组装的方法将PBANT AC分子组装成多层膜 .在 488nm的偏振Ar+ 激光的照射下 ,聚合物薄膜中的偶氮苯生色团可发生光致取向 ,取向有序度约 0 0 5 .偶氮苯生色团的顺反异构化反应使H 聚集体在光照后发生解聚集 相似文献
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合成了一种主链含偶氮生色团的线性聚酯,用核磁共振、热分析、紫外-可见光谱、红外光谱、GPC等方法对其结构进行了表征.该聚合物膜在线偏振激光的作用下,光致取向形成的双折射各向异性Δn可达0.07.聚合物的旋涂膜经干涉的P偏振488nmAr+激光照射60min后,得到了规则的正弦表面起伏光栅,光栅的一级衍射效率约为18%. 相似文献
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利用后重氮偶合反应,将4-(三氟甲基)苯胺的重氮盐与两种具有高苯胺残基密度的环氧树脂类前体聚合物在极性有机溶剂中反应,制备了两种具有高生色团密度的环氧树脂类偶氮聚合物PEP-AZ-CF3和PEP-35AZ-CF3.利用1H-NMR、FTIR、UV-Vis和DSC等分析方法对2种偶氮聚合物结构、热性能及吸收光谱性能进行了分析及表征.研究了在不同波长的激光(488、532及589 nm)照射下,2种偶氮聚合物薄膜光致表面自结构的形成.研究结果表明,入射激光的波长对偶氮聚合物表面自结构现象的形成有明显影响.仅在波长488 nm的偏振激光(线偏振光或圆偏振光)照射下,2种偶氮聚合物薄膜表面能观察到自结构现象.圆偏光比线偏光更有利于诱导表面起伏结构的形成,但形成的表面结构不具备长程取向有序性.聚合物生色团中偶氮键邻位的取代甲基对表面自结构的形成起到阻碍作用. 相似文献
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采用封管反应, 以较高产率(80%以上)合成了一种PMMA型的极化非线性光学聚合物材料. 该材料具有很好的成膜性, 用电晕极化的方法使其旋涂膜中的生色团极化取向, 并利用偏振红外光谱和偏振紫外光谱等方法, 对膜中生色团极化前后的取向进行了研究. 相似文献
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一种具有可逆光加工特性的偶氮聚电解质的合成与表征 总被引:1,自引:0,他引:1
合成一种具有可逆光加工特性的偶氮聚电解质(PAA-AZ),用核磁、热分析、紫外-可见光谱、接触角及GPC等手段对其进行了结构和性能表征.PAA-AZ的旋涂膜用线偏振Ar+激光照射一段时间,在原子力显微镜(AFM)下观测其表面,膜表面形成了规整有序纳米尺寸的三维表面图案表面起伏光栅(起伏深度为100nm).用氦氖激光检测了PAA-AZ旋涂膜一级衍射效率与光照时间的关系. 相似文献
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以金属钛为靶材、O2/N2/Ar混合气氛为溅射气体,在导电玻璃(ITO)表面磁控溅射一层薄膜,再经300-500℃退火处理制备了氮掺杂TiO2薄膜.采用X射线衍射(XRD)、X光电子能谱(XPS)、扫描电子显微镜(SEM)和紫外-可见吸收光谱等对薄膜的微观结构、光学特性和光电化学性能等进行了研究.进而采用化学沉积的方法在TiO2-xNx薄膜表面沉积上一层多孔NiO薄膜,研究表明,制备的ITO/TiO2-xNx/NiO双层薄膜具有明显的光电致色特性,400℃退火处理的氮掺杂TiO2薄膜具有最高的光电流响应,经氙灯照射1h后,薄膜从无色变成棕色,500nm波长处光透过率从79.0%下降至12.6%. 相似文献
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采用脉冲激光沉积(PLD)法在Si(111)衬底上制备了Eu3+,Li+共掺杂的ZnO薄膜,分别在450,500,550和600℃条件下进行退火,退火气氛为真空。利用X射线衍射(XRD)仪和荧光分光光度计研究了退火温度对薄膜结构和光致发光(PL)的影响。研究结果表明,Eu3+,Li+共掺杂的ZnO薄膜具有c轴择优取向,Eu3+,Li+没有单独形成结晶的氧化物,均以离子形式掺入ZnO晶格中。PL谱中有较宽的ZnO基质缺陷发光,ZnO基质与稀土Eu3+之间存在能量传递,但没有有效的能量传递。随着退火温度的增加,薄膜发光先增强后减弱,退火温度为550℃时发光最强。当用395 nm的激发光激发样品时,仅观察到稀土Eu3+在594 nm附近的特征发光峰,但发光强度随退火温度变化不明显。 相似文献
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An optical CO gas sensor was investigated using cobalt oxide thin films prepared by pulsed laser deposition. The cobalt oxide films were deposited on quartz glass and silicon wafer substrates in Ar at 0.07-133 Pa. The morphology and crystal phase of the films were changed by Ar pressure. Sensitivity was estimated as the transmittance change of the film in dry air and at 200 ppm of CO gas ambient at 350 degrees C. The morphology of the films greatly affected the sensing properties. The optimum Ar pressure for cobalt oxide film preparation for CO gas sensing was suggested to be 13.3 Pa, based on the relationship between the morphology and the optical sensor properties of the films. 相似文献
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Bragg-type polarization gratings formed in thick polymer films containing azobenzene and tolane moieties 总被引:1,自引:0,他引:1
Ishiguro M Sato D Shishido A Ikeda T 《Langmuir : the ACS journal of surfaces and colloids》2007,23(1):332-338
Holographic gratings were formed in thick polymer films containing azobenzene and diphenylacetylene (tolane) moieties in the Bragg regime. Amorphous polymers containing various contents of the azobenzene moiety with photosensitivity and the tolane moiety with large birefringence in the side chain were synthesized, and optically transparent thick polymer films were prepared. The films were irradiated with a linearly polarized beam from an Ar+ laser (488 nm), and the transmittance of a He-Ne laser beam (633 nm) through a pair of crossed polarizers, with the film between them, was measured to estimate a photoinduced birefringence (deltan). The value of deltan increased with an increase in the tolane moiety content in the polymer films. When two linearly polarized beams at 488 nm were interfered in the film, a diffraction beam was observed, and the maximum diffraction efficiency (eta) increased with the tolane moiety content. In the film containing 70 mol% of the tolane moiety, the highest eta of 99% was achieved, and angular selectivity due to Bragg diffraction was clearly observed. We consider the cooperative molecular motion of the tolane moieties to be induced by the photoinduced change in alignment of the azobenzene moieties even if the polymers show no liquid-crystalline phase. When two orthogonal circularly polarized beams were allowed to interfere in the film, a Bragg-type polarization grating was formed. It was found that the value of eta reached 90% within 920 ms. 相似文献
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