CeO2修饰的透明TiO2纳米管电极的电致变色器件

采用电化学沉积法在阳极氧化制备的TiO2纳米管阵列管壁上沉积一层CeO2纳米颗粒,再将CeO2修饰的透明TiO2纳米管阵列薄膜对电极与聚三甲基噻吩变色电极组装成透过型电致变色器件.实验结果表明:CeO2修饰的TiO2纳米管阵列薄膜仍保持良好的光透过性,其电荷存储能力比纯TiO2纳米管电极提高了30%.经CeO2修饰的TiO2纳米管改善了器件的性能,与对电极为单一TiO2纳米管阵列的器件相比,其对比度仍保持在38%左右,其褪色时间由1.3 s缩短为0.8 s.电致变色器件快速响应得益于纳米管与纳米颗粒组成的复合结构的高比表面积和快速的电荷传输过程.     

塑料基TiO2电致变色薄膜制备及性能研究

采用溶胶-凝胶法分别在镀有ITO透明电极的玻璃和塑料基体上制备了TiO2电致变色薄膜,对比研究了不同基体上溶胶的成膜性及薄膜的电致变色性能.结果表明:在相对湿度低于15%的环境中,采用0.4mol/L的溶胶可以通过多次提拉制得表面光洁的较厚透明TiO2薄膜;随热处理温度的升高,薄膜的电色可逆性变好,循环寿命变大,但离子储存能力下降;塑料基TiO2薄膜与相同条件下制备的玻璃基薄膜具有相似的性能,呈现出较弱的阴极电致变色效应和较强的Li 储存能力,有望用作柔性电致变色器件的对电极.     

TiO2纳米晶半导体电极及有机-无机电致变色器件的研究

通过丝网印刷工艺，制备了具有高的比表面积的纳米晶氧化钛薄膜，通过有机／无机复合，在氧化钛薄膜表面吸附了单层的电变色子，制备成纳米晶电极并且装配成三明治结构的电致变色器件．通过紫外可见分光光度计表征，该器件的着色态透过率为4％，退色态透过率为85％．其在智能窗、平板显示器、电子书和电子报纸等领域具有潜在的应用前景．     

聚苯胺薄膜修饰电极的电化学制备及应用

介绍了聚苯胺薄膜电化学合成的原理、聚苯胺薄膜修饰电极的电化学制备方法及影响因素,综述了聚苯胺薄膜修饰电极在电致变色和电致变发射率器件、电催化和电分析、二次电池等方面的应用.     

氧化钼电致变色材料与器件

电致变色材料具有可逆的颜色转变特性, 在智能窗、显示器、防眩后视镜、电子纸、军事伪装等领域应用广泛。相对于其它种类的显示器件, 电致变色显示器件具有色彩丰富、对比度高、无视盲角、断电后仍显色等优点。作为一种典型的阴极着色电致变色材料, 氧化钼具有响应时间短和着色态更接近于人眼对光线的敏感波段等优点, 使得由氧化钼组成的电致变色器件具有重要的研究价值。本文简要介绍了电致变色、电致变色材料与器件的定义及其应用, 尤其电致变色技术最近在智能手机上得到了示范应用, 表明电致变色技术未来有良好的发展前景。然后, 详细综述了氧化钼薄膜的制备、氧化钼的改性、氧化钼电致变色器件的研究进展。最后提出了氧化钼电致变色薄膜与器件当前存在的问题和解决的途径, 并对其发展前景进行了展望。     

导电聚合物PEDOT:PSS纸基印刷成膜和变色器件的制备

目的 以导电聚合物PEDOT:PSS作为电极和电致变色材料,通过棒涂、丝网印刷和凹版印刷等3种方式,实现导电聚合物纸基电致变色器件的制备.方法 通过溶剂(二甲基亚砜、异丙醇、甲醇、乙二醇、聚乙烯醇)掺杂的方式对3种印刷成膜特性进行优化;使用丙三醇提高PEDOT:PSS薄膜的导电性,采用PEDOT:PSS制作器件的变色层和电极层,简化变色器件结构.分别对变色器件的启动电压、变色效果、紫外吸收和弯曲等性能进行评价.结果 3种印刷方式均能实现纸基变色器件的制备,其中以凹版印刷方式制备的变色器件具有最佳的变色性能,即启动电压低(U=0.18 V)、响应时间短(t=2 s)、色差变化大(ΔE*=25.54),变色前后吸光度变化大(0.27),弯曲循环1000次后色差变化为1.结论 电致变色器件可以通过印刷的方式在纸基材料上进行制备,将纸基电致变色器件与印刷包装产品相结合,不仅能提高产品包装的外观表现,还可以增加产品包装的技术水平.     

TiO2基底对MoO3/TiO2复合薄膜电致变色性能的影响EI北大核心CSCD

采用水热法首先在导电玻璃上制备TiO2纳米线,随后电沉积涂覆MoO3薄膜,成功制备MoO3/TiO2复合薄膜。利用电化学测试与光谱测试,得到MoO3/TiO2复合薄膜的扩散系数、着色/退色的响应时间、光密度、电致变色可逆性和着色效率等参数,研究不同水热生长时长TiO2纳米线基底对MoO3/TiO2复合薄膜的电致变色性能的影响。结果表明:水热生长6h TiO2纳米线的MoO3/TiO2复合薄膜具有最佳的电致变色性能,扩散系数为2.86×10^-12 cm^2·s^-1,可逆性值为60.88%,光密度为0.41,着色效率达到124.49 cm^2·C^-1,着色和退色响应时间分别为13.53 s和12.65 s。     

层状自组装聚苯胺纳米复合电致变色薄膜的制备与性能

质轻、柔性、多色电致变色材料是柔性电致变色显示技术实用化、进而取代目前阴极射线管和液晶显示技术的关键。主链共轭型本征态导电聚合物聚苯胺因其原料来源广泛、转换电势低、变色范围宽、易于制成柔性薄膜而成为制备全固态柔性电致变色器件的首选材料。基于静电作用的层状自组装技术，能在分子层次上实现诸多材料的复合，并实现结构与性能的调控，因此成为设计组装具有特定性能的聚苯胺纳米复合电致变色薄膜的重要方法。讨论了层状自组装聚苯胺纳米复合电致变色薄膜的制备与性能，认为采用结构与性能可控的纳米结构层状自组装技术制备聚苯胺纳米复合电致变色薄膜是提高其综合性能并最终实用化的重要途径。     

聚邻甲基苯胺的电化学合成与电色及光伏性能

为了得到平整并与基底结合牢固的聚邻甲苯胺,使之在电致变色和光伏材料上得到应用,用电化学的方法在ITO电极上制备了聚邻甲苯胺.考察了聚合条件对成膜的影响,对聚合物薄膜进行了红外、拉曼、紫外、荧光等结构表征,利用电子扫描显微镜(SEM)观测了复合膜形貌特征,采用原位电化学-光谱技术研究了聚合物的电致变色行为.首次以聚邻甲苯胺/TiO2复合膜为工作电极,铂电极为对电极,制成太阳能电池模型,测试了器件的光伏性能.研究表明:在聚合条件为单体浓度0.2 mol/L,硫酸浓度在0.5～1 mol/L、扫描速度0.02 V/s、扫描电压0～1.0 V时得到膜牢固平整;薄膜呈现岛状突起结构;电压从0增加至0.8 V,薄膜颜色从绿到蓝变化,且过程可逆;复合电极显示出明显的光伏特性.因此,说明聚邻甲苯胺是一种双功能性材料.     

纳米二氧化锰的制备及其应用研究进展

二氧化锰作为一种重要的过渡金属氧化物, 因其储量丰富、晶型多样、性能优异而备受关注。将二氧化锰纳米化后, 其颗粒尺寸变小、比表面积变大、材料性能优化、应用领域得以拓宽。本文在引言部分从介绍二氧化锰的应用着手, 指出纳米化和晶型多变对二氧化锰的结构和性能有着重要的影响。正文部分主要从纳米二氧化锰的制备方法和纳米二氧化锰的应用两个方面对近年来的研究进展进行了总结和评述。(1)介绍了水热法、溶胶-凝胶法、化学沉淀法、固相合成法等纳米二氧化锰的制备方法, 对各种制备方法的优点与缺点以及所制备纳米二氧化锰的形貌与性能进行了总结。(2)综述了纳米二氧化锰在储能电极、电致变色器件、催化剂、生物传感器等领域的应用研究进展。纳米二氧化锰可作为电池的正极材料和超级电容器的电极材料。通过调控二氧化锰的晶型和复合制备的含锰复合氧化物用于锂离子电池的正极材料, 可提高电池的容量并改善循环稳定性。作为锂离子动力电池的正极材料已有产业化应用, 在新能源汽车领域具有良好的应用前景。由于纯二氧化锰本身的颜色主要是在棕色和黄色之间变化, 光调制幅度较小, 因此作为电致变色器件的电极材料, 通常将其与其它光调制幅度较大的材料进行复合使用。如聚苯胺/二氧化锰杂化电致变色薄膜较纯聚苯胺薄膜在形貌、结构和电致变色性能上有巨大差异, 显示出更高的光调制幅度、着色效率和循环稳定性。纳米二氧化锰在乙苯的催化转化和空气污染物的催化消除方面发挥重要作用。纳米二氧化锰能够增大电流响应、降低检出限, 使检测的灵敏度大大提高, 近年来在生物传感器领域逐渐被大家重视并得到广泛应用, 如二氧化锰纳米片辅助荧光偏振生物传感器可有效检测环境水样中Ag⁺, PtAu-MnO₂二元纳米结构修饰的石墨烯纸在非酶葡萄糖检测中表现出良好的传感性能。在结语部分, 分析了当前纳米二氧化锰的制备和应用方面存在的问题, 指出了纳米二氧化锰在锂离子电池正极材料和电致变色器件中应用的发展方向, 并对其未来的发展前景进行了展望。     

P3HT及CTCHT修饰纳米TiO2的光电性能研究

用光电流作用谱、光电流-电势图等光电化学方法研究了聚3-己基噻吩(P3HT)及3-己基噻吩和2-噻吩甲酸共聚物(CTCHT)修饰纳米结构TiO2电极的光电转换性质。结果表明,经修饰后的纳米TiO2电极光电流明显增强,光电转换效率得到明显提高。在复合膜电极中存在p-n异质结,异质结的存在有利于光生电子-空穴对的分离,降低了电荷的反向复合几率,提高了光电转换效率。     

Synthesis of TiO2-based nanotube on Ti substrate by hydrothermal treatment

TiO2-based titanate nanotube film was directly synthesized by hydrothermal treatment of Ti substrate in NaOH solution. The prepared high aspect ratio nanotubes have diameter of 10 nm and pore size of 5 nm with length of several microns. The nanotubes show the same structure and component characteristics as the nanotubes prepared through hydrothermal treatment of TiO2. Other nanostructured titanate as oriented nanofiber film and translucent film were also prepared by adjusting the hydrothermal conditions. The formation mechanism of nanostructured titanate was discussed.     

Nanostructured carbon-doping anodic TiO2 from TiC and its photoelectrochemical properties

In this paper, nanostructured carbon-doped titanium dioxide (TiO(2-x)Cx) has been fabricated from titanium carbide (TiC) thin film using electrochemical anodization in a solution containing fluorine ion. The resulting samples were characterized via scanning electron microscopy (SEM), energy dispersive X-ray (EDX) analysis, X-ray diffraction (XRD), and photoelectrochemistry. The SEM images and EDX analysis indicated that a nanostructured thin film of carbon-doped titanium dioxide had been formed. The XRD pattern showed the structural change from TiC to anatase type TiO2 after annealing. A series of photoelectrochemical measurement showed an increase in photovoltage and in photocurrent for the electrode of anodized TiC sample. The results demonstrated the feasibility to process carbon doped nanostructured TiO2 through anodization promising for applications in high efficient photoelectrochemical conversion.     

Electrochemical synthesis and characterization of TiO(2) nanoparticles and their use as a platform for flavin adenine dinucleotide immobilization and efficient electrocatalysis

Here, we report the electrochemical synthesis of TiO(2) nanoparticles (NPs) using the potentiostat method. Synthesized particles have been characterized by using x-ray diffraction (XRD) studies, atomic force microscopy (AFM) and scanning electron microscopy (SEM). The results revealed that the TiO(2) film produced was mainly composed of rutile and that the particles are of a size in the range of 100 ± 50?nm. TiO(2) NPs were used for the modification of a screen printed carbon electrode (SPE). The resulting TiO(2) film coated SPE was used to immobilize flavin adenine dinucleotide (FAD). The flavin enzyme firmly attached onto the metal oxide surface and this modified electrode showed promising electrocatalytic activities towards the reduction of hydrogen peroxide (H(2)O(2)) in physiological conditions. The electrochemistry of FAD confined in the oxide film was investigated. The immobilized FAD displayed a pair of redox peaks with a formal potential of -0.42?V in pH?7.0 oxygen-free phosphate buffers at a scan rate of 50?mV?s(-1). The FAD in the nanostructured TiO(2) film retained its bioactivity and exhibited excellent electrocatalytic response to the reduction of H(2)O(2), based on which a mediated biosensor for H(2)O(2) was achieved. The linear range for the determination of H(2)O(2) was from 0.15 × 10(-6) to 3.0 × 10(-3)?M with the detection limit of 0.1 × 10(-6)?M at a signal-to-noise ratio of 3. The stability and repeatability of the biosensor is also discussed.     

Formation of TiO2 Modified Film on Carbon Steel

A new technique for preparing TiO2 modified film on carbon steel was accomplished by electroless plating and sol-gel composite process. The artificial neural network was applied to optimize the preparing condition of TiO2 modified film. The optimized condition for forming TiO2 modified film on carbon steel was that NiP plating for 50 min, dip-coating times as 4, heat treatment time for 2 h, and the molar ratio of complexing agent and Ti(OC4HZ9)4 kept 1.5:1. The results showed that TiO2 modified film have good corrosion resistance. The result conformed that it is feasible to design the preparing conditions of TiO2 modified film by artificial neural network.     

Construction of hierarchical nanostructured TiO2/Bi2MoO6 heterojunction for improved visible light photocatalysis

In this study, Bi2MoO6 hollow microspheres were modified by depositing TiO2 nanoparticles through a simple hydrothermal method. The prepared TiO2/Bi2MoO6 photocatalysts were characterized by scanning and transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and UV-vis diffuse reflectance spectroscopy. The photocatalytic performance of the heterostructured catalysts was evaluated by degradation of methylene blue (MB) under visible-light irradiation (lambda>420 nm). The photocatalysts based on nanostructured Bi2MoO6 and TiO2 exhibit much higher photocatalytic activity than the single-phase Bi2MoO6 or TiO2 and the mechanical mixture of Bi2MoO6 and TiO2 for degradation of MB under the same conditions. The results reported in this study provide insight into constructing other heterostructured photocatalysts.     

聚3-甲基噻吩修饰量子点硫化镉连接纳米结构TiO2复合膜电极光电化学研究

采用原位化学法在纳米结构TiO2电极上制备了量子点CdS(Q-CdS),并用电化学方法在TiO2/QCdS表面聚合3-甲基噻吩po1y(3-Methylthiophene)(PMeT).通过对PMeT修饰Q-CdS连接TiO2纳米结构膜的研究表明,PMeT和Q-CdS单独修饰纳米结构TiO2电极和PMeT修饰Q-CdS连接纳米结构TiO2电极的光电流产生的起始波长都向长波方向移动;一定条件下在可见光区光电转换效率均较纳米结构TiO2的光电转换效率有明显的提高;聚3-甲基噻吩(PMeT)与Q-CdS连接的纳米结构TiO2之间存在p-n异质结.在一定条件下p-n异质结的存在有利于光生电子/空穴的分离,提高了光电转换效率.