热处理温度对铁电薄膜底电极Pt和Pt／Ti物相与形貌的影响

随着热处理温度上升，在ＳｉＯ２／Ｓｉ衬底上溅射的Ｐｔ、Ｐｔ／Ｔｉ电极中，构成Ｐｔ薄膜的晶粒由小变大，由分布均匀到晶粒局部聚集，最后分离成小岛。Ｔｉ层可提高Ｐｔ薄膜与基片间的粘附性和高温下的稳定性。快速热处理可提高Ｐｔ薄膜在高温下的连续性。并研究了Ｐｔ薄膜对ＰＬＴ铁电薄膜的成品率和分散性的影响。     

脉冲激光淀积法在Pt／TiO2／SiO2／Si（001）衬底上制备Pb（Ta0.05Zr0.45T …

用脉冲激光淀积方法在Ｐｔ／ＴｉＯ２／ＳｉＯ２／Ｓｉ（００１）衬底上制备了掺Ｔａ的ＰＺＴ薄膜,此薄膜显示了理想的铁电性。漏电流特性表明这种异质结构中Ｓｃｈｏｔｔｋｙ场发射机制起主要作用。扫描电镜形貌照射表明ＰＺＴ薄膜结晶很好并且异质结构界面无明显扩散。     

铁、铬离子掺杂对TiO_2薄膜光催化活性的影响

采用溶胶－凝胶法在釉面砖表面制备了均匀的ＴｉＯ２薄膜,并研究了铁、铬离子掺杂对ＴｉＯ２光催化性能影响．对罗丹明Ｂ的光降解实验表明,适量的铁、铬离子掺杂均可提高ＴｉＯ２薄膜的光催化活性,铁离子的掺杂效果明显高于铬离子,而铬离子的掺杂方式影响ＴｉＯ２薄膜的光催化活性,这主要基于它们不同的掺杂机理     

溅射PZT薄膜的晶体结构和快速热处理

采用常温射频（ＲＦ）溅射法和快速热处理相结合的技术，在Ｐｔ／Ｔｉ／ＳｉＯ２／Ｓｉ衬底上，制备出具有铁电性的ＰＺＴ薄膜。研究了快速热处理工艺条件对ＰＺＴ薄膜性能的影响。通过Ｚ射线衍射法、ＳＥＭ和ＡＥＳ等方法，分析了ＰＺＴ薄膜的晶体结构、微结构、薄膜和电极间的界面效应。     

Pt／Ti电极的扩散行为及其对铁电薄膜的影响

采用直流磁控溅射方法制备Ｐｔ／Ｔｉ电极，用ＲＢＳ、ＸＲＤ、ＳＥＭ方法研究了Ｐｔ和Ｔｉ的扩散行为，发现在氧气氛中进行热处理造成Ｔｉ层的快速氧化，Ｔｉ厚度对Ｐｔ／Ｔｉ的扩散有很大影响。Ｐｔ／Ｔｉ的扩散造成其上的铁我差的显微结构和性能。     

Pt扩散阻挡层对PZT／Si薄膜化学结构和性能的影响

运用ＸＰＳ和ＡＥＳ研究了Ｐｔ扩散阻挡层对ＰＺＴ薄膜／Ｓｉ界面休学结构和性能的影响：在ＰＺＴ薄膜和Ｓｉ工间增加Ｐｔ扩散阻挡层，可以抑制ＴｉＣｘ物种和ＴｉＳｉｘ物种的形成，促进ＰＺＴ薄膜的形成反应。Ｐｔ扩散阻挡层的存在阻断了氧和Ｓｉ的相互扩散反应，促进ＰＺＴ物种形成钙钛矿型晶体结构，使得形成的ＰＴ薄膜具有和体相材料相摈 电常数和铁电性能。     

快速热处理对PZT薄膜的微结构及电性能的影响

采用改进的溶胶一凝胶技术,在Ｐｔ／Ｔｉ／ＴｉＯ２／ＳｉＯ２／Ｓｉ（１００）基片上制备了太电ＰＺＴ薄膜,用ＸＲＤ和ＡＦＭ技术分析了不同热处理工艺条件下ＰＺＴ薄膜的微观形貌变化及相结构演化,系统测试了ＰＺＴ薄膜的铁电性能。工艺－结构－性能研究结果表明：快速热处理工艺（ＲＴＡ）有利于ＰＺＴ薄膜保持较低的漏电流密度,热处理温度是影响晶粒大小的主要因素,而保温时间则对ＰＺＴ薄膜的致密性、晶粒均匀度和晶界结合     

非晶态铁电薄膜的铁电相转变

用ＡｒＦ脉冲激光在Ｐｔ／Ｔｉ／ＳｉＯ２／Ｓｉ衬底上合成了非晶态ＳｒＢｉ２Ｔａ２Ｏ９铁电薄膜,研究了铁电相转变。采用常规热退火、激光诱导和低温高压水热法使非晶态ＳＢＴ薄膜发生铁电相转变。     

离子束辅助沉积制备TiO_2-Nb_2O_5氧敏薄膜

采用离子束辅助沉积方法在Ａｌ２Ｏ３陶瓷衬底上制备了ＴｉＯ２Ｎｂ２Ｏ５氧敏薄膜。考察了薄膜组分比及退火温度对薄膜氧敏特性和结构的影响。电阻氧分压特性测试结果表明，纯Ｎｂ２Ｏ５薄膜的氧敏特性优于纯ＴｉＯ２薄膜；掺入少量的Ｔｉ可使Ｎｂ２Ｏ５薄膜的氧敏特性提高，以５ｍｏｌ％ＴｉＯ２掺杂的Ｎｂ２Ｏ５薄膜最佳；过量掺杂则使Ｎｂ２Ｏ５薄膜的氧敏特性明显变差。在５ｍｏｌ％ＴｉＯ２Ｎｂ２Ｏ５薄膜中再掺入少量的Ｐｔ（０３％０５％）可使其氧敏特性更好，而且其响应时间大大缩短。Ｘ射线衍射谱（ＸＲＤ）和Ｘ射线光电子谱（ＸＰＳ）分析表明，在退火后的ＴｉＯ２Ｎｂ２Ｏ５薄膜中Ｎｂ２Ｏ５为单斜（Ｍｆｏｒｍ）结晶相，而掺杂的Ｔｉ以非晶的ＴｉＯ２形式存在，即使在高达３４ｍｏｌ％ＴｉＯ２Ｎｂ２Ｏ５薄膜中也不例外。纯ＴｉＯ２膜为金红石结构。不同退火温度（９００１１０００Ｃ）对薄膜的氧敏特性和结构无明显影响。     

脉冲激光淀积法在Pt/TiO_2/SiO_2/Si(001)衬底上制备Pb(Ta_(0.05)Zr_(0.45)Ti_(0.50))O_3薄膜的铁电性质研究

用脉冲激光淀积方法在Ｐｔ／ＴｉＯ２／ ＳｉＯ２／ Ｓｉ（００１） 衬底上制备了掺Ｔａ 的ＰＺＴ 薄膜。此薄膜显示了理想的铁电性。漏电流特性表明这种异质结构中Ｓｃｈｏｔｔｋｙ 场发射机制起主要作用。扫描电镜形貌照片表明ＰＺＴ 薄膜结晶很好并且异质结构界面无明显扩散。     

Synthesis of TiO2/Pt/TiO2 multilayer films via radio frequency magnetron sputtering and their enhanced photocatalytic activity

TiO₂/Pt/TiO₂ (TPT) multilayered films with different thicknesses of Pt layers from about 0.75 to 12 nm were prepared by radio frequency magnetron sputtering method. The as-prepared films were characterized by X-ray diffraction, scanning electron microscopy, atomic force microscopy, UV-visible diffuse reflectance spectroscopy, and photoluminescence spectroscopy. The photocatalytic activity of the samples was evaluated by the photocatalytic decolorization of methyl blue aqueous solution under ultraviolet light irradiation. The photocatalytic activities of all TPT multilayer films were higher than that of the pure TiO₂ films. When Pt thickness was increased to 3 nm, the measured photocatalytic activity of the TPT film was highest, and exceeded that of the pure TiO₂ films by a factor of more than three times. Such enhancement was ascribed to the presence of Pt layer, which inhibits the recombination of the photogenerated charge and carriers, as well as modifies the crystallinity of the TiO₂ top layer.     

Ag/TiO2光催化薄膜清除乙烯气体的研究

乙烯对果蔬的生长有积极的作用,它可以促进果蔬的成熟,使其变得香甜可口。但果蔬成熟后乙烯的存在又可以加速果蔬的熟化程度,使其变得脆弱、易腐烂。因此,清除乙烯将对果蔬保鲜产生积极的影响。本文采用溶胶一凝胶方法制备了TiO2及Ag／TiO2薄膜。利用气相色谱法通过在自制的反应器内进行检测清除乙烯的实验,比较了TiO2薄膜和Ag／TiO2薄膜的光催化清除乙烯性能。结果发现,TiO2薄膜有较好的光催化清除乙烯性能,掺杂适量的Ag后,Ag／TiO2薄膜有更好的清除乙烯性能。本文还用XRD、SEM对TiO2及Ag／TiO2薄膜的形貌、物相结构、颗粒尺寸进行了表征分析并对实验结果进行了讨论。     

溶胶-凝胶法制备ZnFe2O4纳米薄膜及其光电催化性能研究

用溶胶-凝胶工艺在导电玻璃上制备出纳米ZnFe2O4薄膜,用X射线衍射仪、扫描电镜对膜的粒径、物相进行了表征,对不同层数的薄膜进行了光电催化性能测试.薄膜对甲基橙溶液的降解结果表明:随着ZnFe2O4薄膜层数的增多,对甲基橙的降解率先增大后减小,且以3层的ZnFe2O4膜片效果最好.当外加正向偏压时,薄膜的光催化性能有一定提高,且随着偏压增大而呈波动性增强.同时,薄膜与极板间的距离对薄膜的光电催化活性也有较大影响.     

The influence of the additives composition and concentration on the properties of SnOx thin films used in photocatalysis

The aim of this study is to investigate the influence of different organic additives on the surface properties of SnO_x thin films used for photocatalytic degradation of methylene blue. The films were obtained by anodic oxidation of tin substrate in electrolyte solutions containing green additives based on hydrophobic and hydrophilic maleic anhydride copolymers. The hydrophobic copolymer leads to the formation of thin films with increased specific area which generates a larger interfacial area between the layers and the dye solution. The consequence is an improvement in the photocatalytic efficiency: up to 16% compared to less than 5% for samples electrodeposited without polymer. The hydrophilic copolymer presence in the electrolyte solution leads to higher grain size and lower surface energy which significantly reduce the photocatalytic properties of the layers. The use of copolymers can be a tool for enhancing the surface roughness and film's wettability and thus the photodegradation efficiency.     

复合电沉积制备SnO2/TiO2薄膜及其光电催化性能

为了寻求廉价、高效和稳定的光催化剂,用复合电沉积技术在紫铜片上制备了Sn/TiO2薄膜,经300℃热氧化使之形成SnO2/TiO2复合电极.利用SEM,XRD对薄膜进行了表征,以甲基橙为模型化合物,对复合电极的光催化和光电催化性能进行了测定.研究表明:该薄膜由0.3~1μm的颗粒构成,每个颗粒又由纳米晶粒形成;电极具有多孔结构,膜中的SnO2以两种不同的晶体结构存在;在薄膜质量相等的情况下,SnO2/TiO2薄膜的光催化活性是纯TiO2粒子膜的2.87倍;外加一定偏压下,其催化性能大幅度提高.     

Fe2O3/TiO2和ZnO/TiO2纳米颗粒薄膜的亲水性能和光催化性能的研究

采用溶胶-凝胶法在玻璃上制备了锐钛矿型TiO_2和过渡金属铁、锌离子掺杂的TiO_2薄膜,并通过XRD、XPS、AFM表征了合成的薄膜。结果表明铁和锌离子掺入后,TiO_2薄膜变的更加致密。铁离子和锌离子分别以Fe_2O_3和ZnO的形式存在,在紫外光照射下,TiO_2薄膜表现明显的亲水性,金属离子掺杂的TiO_2薄膜,亲水性能明显增强,铁离子掺入对光催化降解甲基橙有一定的抑制作用;少量的锌离子掺入对光催化降解甲基橙有促进作用,锌离子掺入量增大后,效果并不明显。     

Annealing behaviour and magnetic properties of Co/Pt and Fe/Pt bilayer thin films

The annealing behaviour and magnetic properties of Co/Pt and Fe/Pt bilayer thin films are investigated. The coercivity of Co/Pt bilayer thin films increases with annealing above 450 °C and shows a peak value of 40 kA m⁻¹ in the range from 500 to 550 °C. This increase is due to both the formation of a CoPt solid solution and the optimization of grain diameters. Furthermore, the increase is promoted by multilayering. Similar results were obtained for Fe/Pt bilayer thin films.     

锆钛酸铅(PZT)薄膜的自发极化与压电响应

用溶胶－凝胶法在Ｐｔ／Ｔｉ／ＳｉＯ２／Ｓｉ（１００）基片上制备了近等原子比的压电ＰＺＴ薄膜,在准同型相界附近的ＰＺＴ薄膜的应变机制是受极化控制的压电效应,内电场导致薄膜的自发极化定向,使薄膜未经极化就具有明显的压电响应。     

Electrochemically mediated electrodeposition/electropolymerization to yield a glucose microbiosensor with improved characteristics.

A procedure is described that provides for electrochemically mediated deposition of enzyme and a polymer layer permselective for endogenous electroactive species. Electrodeposition was first employed for the direct immobilization of glucose oxidase to produce a uniform, thin, and compact film on a Pt electrode. Electropolymerization of phenol was then employed to form an anti-interference and protective polyphenol film within the enzyme layer. In addition, a stability-reinforcing membrane derived from (3-aminopropyl)trimethoxysilane was constructed by electrochemically assisted cross-linking. This hybrid film outside the enzyme layer contributed to the improved stability and permselectivity. The resulting glucose sensor was characterized by a short response time (<4 s), high sensitivity (1200 nA/mM x cm2), low interference from endogenous electroactive species, and working lifetime of more than 50 days.     

Ag/TiO2薄膜结构和光催化性能研究

采用溶胶-凝胶技术制备了Ag掺杂的TiO2薄膜.用XRD、氮吸附法、UV-VIS-NIR分光光度计以及XPS对Ag掺杂后TiO2薄膜结构的变化进行了分析;用分光光学法通过在紫外光照下分解亚甲基蓝的实验比较了TiO2薄膜与Ag/TiO2薄膜的光催化性能.结果发现,掺杂适量的Ag有助于TiO2薄膜光催化氧化性能的提高,原因在于:（1）Ag通过引入耗尽层提高了TiO2的电荷分离能力,并吸引空穴向薄膜表面移动,结果使薄膜表面空穴的浓度提高,薄膜光催化效率提高;（2）Ag减小了TiO2粒子的粒径,使TiO2禁带宽度增大,薄膜光催化氧化的能力提高;（3）Ag掺杂后,TiO2薄膜表面对-OH基和水的吸附增加,使光照后TiO2薄膜表面活性自由基·OH的浓度增加,空穴向薄膜所吸附物质的转移能力提高.