稀土联合掺杂TiO2离子存储薄膜的制备及性能

以钛酸四丁酯、硝酸铈和硝酸钐为主要原料,采用溶胶-凝胶法在ITO导电玻璃基片表面制备了Ce,Sm掺杂摩尔分数为2%的Ti O2离子存储薄膜。采用XRD、SEM、循环伏安曲线、紫外-可见透射光谱等技术手段,研究了薄膜的结构、电化学性能和光学性能。结果表明,Ce,Sm掺杂Ti O2薄膜粒度均匀且颗粒细小,相比纯Ti O2薄膜具有更高的无定形程度。在电致变色反应过程中,Ce、Sm掺杂Ti O2薄膜离子存储能力强、循环可逆性好,注入电荷密度为15.12 m C·cm-2,K值为0.7。薄膜具有较好的光学透明度,不同外加电压下薄膜的透射率均在80%左右,可以在电致变色玻璃中作为离子存储材料。     

Ce掺杂TiO2薄膜结构与光电流研究

采用溶胶凝胶-浸渍提拉法在ITO玻璃上制备了纯TiO2、Ce掺杂TiO2薄膜以及纯TiO2、Ce掺杂TiO2粉体.利用XRD、SEM、EDS、XPS等对样品进行晶体结构、表面形貌、化学成分等表征,利用电化学工作站测试了薄膜电极光电流.结果表明:纯TiO2与Ce掺杂TiO2结构均为锐钛矿结构,薄膜掺杂后晶粒粒径减小,掺杂的Ce元素以Ce3+、Ce4共存形式存在,有效地促进了电子-空穴分离,提高了TiO2薄膜电极光电流.     

纳米WO3薄膜的制备及掺杂研究

纳米WO3薄膜在电致变色、气敏材料、共催化剂领域具有广阔的应用前景。综述了纳米WO3薄膜的制备及掺杂对其变色性质的影响。     

掺杂Mo6+对纳米TiO2薄膜亲水性的影响

用溶胶 凝胶法制备了一系列掺杂钼量不同的TiO2纳米薄膜.用XRD,SEM和CAS(ContactAngleSystem)对TiO2薄膜的结构和性能进行了表征.结果表明,Mo6 掺杂浓度对薄膜的热致亲水性和光致亲水性均有影响,当掺Mo6 质量分数为0.75%,热处理温度为400℃时,掺钼TiO2薄膜在黑暗中放置72h后仍能表现超亲水性.     

La3+掺杂TiO2薄膜制备及其电致变色特性研究

基于提高TiO2薄膜的光学属性和着色效率,以钛酸四丁酯和氧化镧为主要原料,采用溶胶-凝胶法,在ITO玻璃表面制备La3+掺杂TiO2薄膜.通过XRD、SEM、EDS、TG-DTA等手段对制备La3+掺杂TiO2凝胶粉末进行表征,使用电化学工作站CHI660E和紫外-可见光分光光度计UV-5500PC对La3+掺杂TiO2薄膜的电致变色性能进行测试.结果表明:凝胶在加热的过程中发生一系列的物理和化学反应,且当温度升高至400 ℃时,系统达到相对热稳定状态.经600℃热处理,La3+掺杂TiO2转化为金红石相.外加电压为-2V时,薄膜显示为深蓝色,反向施压至+2V时,蓝色褪去.金红石相TiO2无定形程度随La3+掺入量增加而提高,对应其着色效率提高.La3掺杂TiO2薄膜在可见光范围内透过率均在70％ ～ 80％,光学性能良好.     

添加聚乙烯醇改善三氧化钨电致变色薄膜性能的研究

为改善三氧化钨薄膜的电致变色性能,采用钨粉过氧化聚钨酸溶胶-凝胶法制备了添加聚乙烯醇的三氧化钨电致变色薄膜.采用扫描电镜、紫外可见分光光度计和CHI电化学工作站分别测定和分析了三氧化钨薄膜的微观结构、光透过性能和循环伏安特性.结果表明,添加一定量的聚乙烯醇可使薄膜的结构更加平整,变色更为均匀;在着色态、褪色态下的光透过率之差达到60%以上,变色可调范围变大.电致变色可逆性能和光谱性能较不添加聚乙烯醇有所提高.     

氧化石墨烯复合TiO2-B薄膜的制备及其电致变色性能

目前具有一维纳米结构的TiO₂薄膜在电致变色领域应用主要受限于材料光调制幅度小、响应时间长、循环稳定性差等缺点。为了解决上述问题,本文采用沉积法将B型二氧化钛纳米管（TiO₂-B）与氧化石墨烯复合,以TiO₂粉末为原料,采用水热法得到钛酸纳米管后,利用沉积法在氟掺杂的氧化锡玻璃（FTO）基底上制备了高透明度、大光调制范围以及优良循环性能的氧化石墨烯复合B型二氧化钛纳米管电致变色薄膜（GO/TiO₂）。借助XRD、XPS、Raman、FESEM、HR-TEM等分析手段研究了氧化石墨烯用量对GO/TiO₂复合薄膜电致变色性能的影响。研究结果表明,当GO与钛酸纳米管的质量比（GO/钛酸）为7％时,GO/TiO₂复合薄膜离子扩散系数为1.46×10^-8cm²/s,着色效率值为38.1cm²/C,具有良好的电致变色性能。在-1.6V、633nm处,GO/TiO₂电致变色薄膜的光调制幅度可达77％,GO/TiO₂薄膜的着色和漂白时间分别为28.6s和4.8s,100次循环后的光调制幅度保持率为96.1％。     

有机硅改性聚甲基丙烯酸甲酯一聚苯胺复合材料的制备及其电致变色性能研究

本文采用溶液聚合法及乳液聚合法合成了可溶性聚苯胺,用光电子能谱、X－射线衍射对其本征态及掺杂态的结构进行了表征。以甲基丙烯酸甲酯－甲基丙烯酰丙基三甲氧基硅烷共聚物为基体,用溶液复合法制备了聚苯胺复合电致变色膜,并采用扫描电镜、循环伏安法等对其结构和电致变色性能进行研究。结果表明复合电致变色膜在稳定态时仅出现第二氧化峰,在外加电压作用下其颜色在绿色至蓝黑色之间可逆变化。共聚物中含有偶联剂组分可以提高电致变色膜与ITO导电玻璃基底的粘结性及改善复合电致变色薄膜的耐溶剂性能。     

普鲁士蓝基电致变色薄膜制备及性能的研究进展EI北大核心CSCD

讨论了普鲁士蓝(PB)的电致变色机制,总结了近年来国内外学者为提高其电致变色性能进行的研究。概述了目前制备PB薄膜的主要方法及其工艺与性能的关系,陈述了PB与其他材料复合对电致变色器件性能改善的机理。说明了缩短离子扩散距离、增大与离子层接触面积及改善基底导电性是提高PB电致变色器件性能的重要方法。最后提出PB电致变色器件的未来的开发不应再仅局限于提高其光学和电学性能,更多的应该是与柔性材料复合集成多种功能以拓展电致变色器件的应用范围。     

普鲁士蓝基电致变色薄膜制备及性能的研究进展

讨论了普鲁士蓝(PB)的电致变色机制,总结了近年来国内外学者为提高其电致变色性能进行的研究。概述了目前制备PB薄膜的主要方法及其工艺与性能的关系,陈述了PB与其他材料复合对电致变色器件性能改善的机理。说明了缩短离子扩散距离、增大与离子层接触面积及改善基底导电性是提高PB电致变色器件性能的重要方法。最后提出PB电致变色器件的未来的开发不应再仅局限于提高其光学和电学性能,更多的应该是与柔性材料复合集成多种功能以拓展电致变色器件的应用范围。     

Microstructure and mechanical properties of Mo/DLC nanocomposite films

Mo-doped diamond-like carbon (Mo/DLC) films were deposited on stainless steel and Si wafer substrates via unbalanced magnetron sputtering of molybdenum combined with inductively coupled radio frequency (RF) plasma chemical vapor deposition of CH₄/Ar. The effects of Mo doping and sputtering current on the microstructure and mechanical properties of the as-deposited films were investigated by means of X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman spectroscopy, atomic force microscopy (AFM), and nano-indentation. It was found that Mo doping led to increase in the content of sp² carbon, and hence decreased the hardness and elastic modulus of Mo/DLC films as compared with that of DLC films. The content of Mo in the films increased with the increasing sputtering current, and most of Mo reacted with C atoms to form MoC nanocrystallites at a higher sputtering current. Moreover, the Mo-doped DLC films had greatly decreased internal stress and increased adhesion to the substrate than the DLC film, which could be closely related to the unique nanocomposite structure of the Mo-doped films. Namely, the Mo/DLC film was composed of MoC nanoparticles embedded in the cross-linked amorphous carbon matrix, and such a kind of nanostructure was beneficial to retaining the loss of hardness and elastic modulus.     

Effect of the Growth Parameters on Nonlinear Optical Properties of Al‐Doped ZnO Nano Films

The objective of this research work is to provide a systematic method to perform test and evaluation on the nonlinear optical properties of Al‐doped ZnO nano thin film structure for designing a high‐performance optical‐electronic structure. Some different kinds of samples can be manufactured for testing. The samples are designed by changing technical parameters such as sputtering power of Al and ZnO, pressure and sputtering time and each parameter has three levels. The test results show that the main factor is the sputtering power of Al, which means the doping density of Al. In the meantime, the Maxwell–Garnett theory is used to investigate the optical prosperities of Al‐doped ZnO nano thin films in the visible range. The optical band gap of Al‐doped ZnO nano thin films increases with the increasing of Al doping density, but it becomes slowly when the doping density is more than 16.0%. The results and the investigation method are useful for designing and manufacturing for nano thin films.     

Photocatalytic performance of highly transparent and mesoporous molybdenum-doped titania films fabricated by templating cellulose nanocrystals

In this paper, the synthesis of mesoporous Mo-doped titania films templated by cellulose nanocrystals (CNCs) and their photocatalytic performance are reported for the first time. The prepared titania composite precursors containing the CNCs and molybdenum chloride were spin-coated on indium tin oxide (ITO) glass substrate, followed by calcining at 400?°C for 1?h. X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET), scanning electron microscope (SEM), and UV–vis spectrometer were employed to characterize the phase composition, pore structure, morphology, and optical property of the titania films in relation to CNCs templating and Mo doping. Photocatalytic performances of the titania films were also evaluated on the photodegradation of trichloroethylene under a fluorescent light source. The Mo-doped titania films with CNCs templating were highly transparent and mesoporous, exhibiting only anatase phase, high specific surface areas ranging in 135.4 – 149.0?m²/g, and small crystallite sizes of 9.5 – 11.1?nm. The results indicate that Mo ions were successfully doped by substituting for Ti ions in the titania lattice. The Mo doping stabilized the anatase phase and also increased the surface area of the CNCs-templated titania film while decreasing the mean pore width. Notably, the visible light absorption capacity and photocatalytic activity of the CNCs-templated titania films doped with Mo were dramatically greater than those of the pure and the CNCs-templated titania films, which is ascribed to the decreased recombination rate of photoexcited charges and the increased surface area with aids of the CNCs templating and the Mo doping.     

Improving electrochromic behavior of spray pyrolised WO3 thin solid films by Mo doping

The effects of molybdenum [Mo] doping on the electrochromic behavior of spray pyrolised tungsten trioxide [WO₃] thin films have been studied. It has been observed that the color-bleaching kinetics, coloration efficiency, and stability of electrochromic WO₃ films are closely related to molybdenum doping concentration, apart from their microstructure and crystallinity. While a nominal 6.0 at.% molybdenum doping produces best electrochromic response in WO₃ films, the electrochemical stability is highest when the nominal concentration of molybdenum is about 2.0 at.%. The improved electrochromic behavior of the Mo doped WO₃ films has been explained from the improved H⁺ ion diffusion coefficient in the films during coloration and decoloration process.     

工艺参数对磁控溅射WO_3薄膜电致变色性能的影响

本文采用磁控溅射法制备了用于电致变色器件的WO_3薄膜,用X射线衍射仪(XRD)、场发射扫描电镜(FE-SEM)、紫外-可见分光光度计(UV-Vis)对其物相组成、微观形貌以及电致变色性能进行了表征。结果表明:在溅射压强为2 Pa、氩氧比为60:20时所制备的WO_3薄膜厚度适中,且有利于离子的嵌入/脱出,而以此薄膜制备的电致变色器件光调制范围最大,褪色时间最短,着色效率达82.9 cm~2/C。     

Fe掺杂对Ba0．5Sr0．5TiO3薄膜微观结构与电学性质的影响研究

笔者利用射频磁控溅镀法在Pt／SiO2／Si（100）基板上制备出Fe掺杂量分别为0、0．5％、1．0％、2．0％、3．0％及5．0％的Ba0．5Sr0．5TiO3薄膜,并讨论了Fe掺杂含量对其微观结构结与电学性质的影响。由XRD分析可知,Fe掺杂对Ba0．5Sr0．5TiO3薄膜的晶体结构并无较大的影响;从SEM结果则可得出,微量Fe掺杂时薄膜较为致密,且晶粒大小较一致。电性结果表明,掺Fe薄膜的相对介电常数和电容均呈现下降趋势,且Fe掺杂含量分别为0．5％、1．0％及2．0％时薄膜具有较小的漏电流密度。     

Fe掺杂对Ba0.5Sr0.5TiO3薄膜微观结构与电学性质的影响研究

笔者利用射频磁控溅镀法在Pt/SiO2/Si(100)基板上制备出Fe掺杂量分别为0、0.5%、1.0%、2.0%、3.0%及5.0%的Ba0.5Sr0.5TiO3薄膜,并讨论了Fe掺杂含量对其微观结构结与电学性质的影响。由XRD分析可知,Fe掺杂对Ba0.5Sr0.5TiO3薄膜的晶体结构并无较大的影响;从SEM结果则可得出,微量Fe掺杂时薄膜较为致密,且晶粒大小较一致。电性结果表明,掺Fe薄膜的相对介电常数和电容均呈现下降趋势,且Fe掺杂含量分别为0.5%、1.0%及2.0%时薄膜具有较小的漏电流密度。     

Multi-electrochromism behavior and electrochromic mechanism of electrodeposited molybdenum doped vanadium pentoxide films

Molybdenum doped vanadium pentoxide (Mo doped V₂O₅) films are prepared by cathodic electrodeposition on indium tin oxide substrate from Mo doped V₂O₅ sol. As an anodic and cathodic coloration electrochromic material, the electrodeposited Mo doped V₂O₅ film presents a better cycling stability, reversibility and multi-electrochromic behavior (orange-yellow-green-blue) with an optical modulation of 60-90% in the spectral region 550-900 nm, which can be expected as a result of enhanced electron intervalence transfer between Mo⁶⁺ and V⁵⁺, V⁴⁺ states, in addition to V⁵⁺ and V⁴⁺ transition. The electrochromic mechanism of Mo doped V₂O₅ films is investigated with atomic force microscopy, X-ray diffraction, X-ray photoelectron spectroscopy and electrochemical impedance spectroscopy. The surface roughness of the film increase at the different coloration states due to the increasing crystallinity degree. The change of the interlayer spacing for the host V₂O₅ and the change of the C and Li element states verify the insertion of organic solvent into the interlayer of the host V₂O₅ and some of the Li⁺ ions into the sites in the V-O layers. The electrochromic kinetics process indicates that the electrochromism of Mo doped V₂O₅ films can be considered as a reversible reduction/oxidation process accompanying the insertion/extraction of Li⁺ ions and electrons.     

Experimental and Numerical Evaluation on Optical Properties of Al‐Doped ZnO Film Materials

The aim of this article is to provide a systematic method to perform numerical and experimental evaluation on the optical properties of Al‐doped ZnO nano thin films. Some different doping density samples are deposited for testing the transmittance. The results show that the transmittance of Al‐doped ZnO has a nonlinear relation with the optical constants and Al‐doped quantity. The optical band gap of the Al‐doped ZnO decreases with the Al doping quantity increasing. Meanwhile, the Maxwell‐Garnett (MG) theory is used to investigate the optical properties of Al‐doped ZnO nano thin films in visible range. The comparison can illustrate the validity of both test and design method. It implies a potential design and evaluation method for developing a new type of ceramic nano thin film in engineering.