热处理对V2O5纳米薄膜组织与性能的影响

用溶胶-凝胶技术结合旋涂法在硅基片上制备了V2O5纳米薄膜,对样品在空气中进行不同温度的热处理.用X射线衍射(XRD)、扫描电子显微镜(SEM)和FT-IR对V2O5薄膜进行了表征,研究了V2O5的生长过程和反应过程的机理及其微结构随温度的变化.结果表明,可以通过升高热处理温度来提高薄膜样品的结晶程度、颗粒尺寸及其均匀程度,并增强V2O5(001)晶面的取向性,当热处理温度升高至500℃时,样品由非晶薄膜转变为致密的棒状多晶薄膜.同时随着热处理温度的升高,样品中的V4 被氧化为V5 ,使薄膜样品结构发生了重排,V=O振动模式发生蓝移.     

热处理对纳米TiO2薄膜结构的影响及其光催化性能

采用溶胶-凝胶法在玻璃基体表面制备纳米TiO2薄膜，通过热处理改变其结构性能，X-射线衍射结果表明，经100℃处理后无明显衍射峰，纳米TiO2薄膜为非晶态，没有发生结构转变：经450℃处理后出现明显的锐钛矿结构衍射峰，但衍射峰的强度较弱，生长过程中锐钛矿在（101）面上具有一定的择优取向：经650℃处理后出现金红石结构衍射峰。催化降解性能表明．经450℃处理后得到的锐钛矿结构纳米TiO2薄膜具有较好的光催化性。     

纳米TiO2薄膜的制备及自清洁性能研究

通过溶胶一凝胶法在普通钠钙玻璃表面制备均匀透明的纳米TiO2自清洁薄膜。探讨了薄膜制备的工艺条件，并利用X射线衍射（XRD）、紫外分光光度计对薄膜的晶型、晶粒大小和透光率进行了表征，研究了在紫外光照射下薄膜的光催化性能及亲水性能。结果表明，制得的TiO2薄膜具有较强的自清洁性能。     

溶胶-凝胶法制备纳米TiO2薄膜

用溶胶-凝胶法，以钛酸丁脂为先驱体、无水乙醇为溶剂、二乙醇胺为络合剂，以载玻片为基体采用溶胶．凝胶浸渍提升法制备纳米TiO2薄膜。探讨制备过程中影响薄膜质量的因素，用NDJ-8S数字显示粘度计测定溶胶在溶胶．凝胶过程中的粘度随存放时间的变化；差热分析仪分析有机物的热分解行为和晶型转变；红外光谱仪对干凝胶相组成进行分析；扫描电镜对薄膜的表面形貌、颗粒的均匀性等进行研究。结果表明；可在玻璃基体上镀上纳米TiO2薄膜；粘度随着陈化时间成正比关系；薄膜表面光滑，颗粒较均匀且达到纳米级颗粒。     

溶胶-凝胶法制备纳米TiO2薄膜

用溶胶-凝胶法,以钛酸丁脂为先驱体、无水乙醇为溶剂、二乙醇胺为络合剂,以载玻片为基体采用溶胶-凝胶浸渍提升法制备纳米TiO2薄膜.探讨制备过程中影响薄膜质量的因素,用NDJ-8S数字显示粘度计测定溶胶在溶胶-凝胶过程中的粘度随存放时间的变化;差热分析仪分析有机物的热分解行为和晶型转变;红外光谱仪对干凝胶相组成进行分析;扫描电镜对薄膜的表面形貌、颗粒的均匀性等进行研究.结果表明:可在玻璃基体上镀上纳米TiO2薄膜;粘度随着陈化时间成正比关系;薄膜表面光滑,颗粒较均匀且达到纳米级颗粒.     

热处理对纳米TiO_2薄膜结构的影响及其光催化性能

采用溶胶-凝胶法在玻璃基体表面制备纳米TiO2薄膜,通过热处理改变其结构性能,X-射线衍射结果表明,经100℃处理后无明显衍射峰,纳米TiO2薄膜为非晶态,没有发生结构转变;经450℃处理后出现明显的锐钛矿结构衍射峰,但衍射峰的强度较弱,生长过程中锐钛矿在(101)面上具有一定的择优取向;经650℃处理后出现金红石结构衍射峰。催化降解性能表明,经450℃处理后得到的锐钛矿结构纳米TiO2薄膜具有较好的光催化性。     

Preparation and characterization of the TiO2-V2O5 photocatalyst with visible-light activity

Visible-light responsive TiO2-V2O5 catalyst was prepared using a binary sol-gel and in-situ intercalation method. The TiO2 sol and V2O5 sol were mixed to disperse the V2O5 species in the TiO2 phase at molecular level. The binary sol was then intercalated into interspaces of polyaniline （PANI） by means of in-situ polymerization of aniline. Conglomeration of the TiO2-V2O5 dusters during the calcination process was avoided because of the wrap of polyaniline. The surface mor- phology, the crystal phases, the structure, and the absorption spectra of （PANI）,/TiO2-V2O5 and the composite catalyst were studied using SEM, XRD, FT-IR, and UV-Vis. The photoactivity of the prepared catalyst under UV and visible light irradiation were evaluated by decolorization of methylene blue （MB） solution. The results showed that the composite catalyst displayed a homogeneous anatase phase, and the vanadium pentoxide species was highly dispersed in the TiO2 phase. The composite catalyst responded to visible light because of the narrowed band gap. In this study, the catalyst with the sol volume ratio of TiO2： V2O5 = 10：1 presented the best photocatalytic activity.     

N掺杂TiO2薄膜光催化性能的研究

采用溶胶-凝胶法，以Ti（OC4H9）4和氨水等为原料制备纯二氧化钛、N掺杂以及N，Zn^2＋共掺杂的二氧化钛光催化薄膜。用X射线衍射和X光电子能谱等对薄膜进行了表征，紫外光和可见光下催化剂降解甲基橙溶液的实验结果表明，掺杂TiO2薄膜比无掺杂TiO2薄膜的光催化效率明显提高，并且可见光下对甲基橙溶液有一定的光催化活性，但Zn^2＋的存在对掺杂薄膜的光催化效率没有显著改善。分析原因可能是N掺杂在价带和导带之间形成了缺陷能级，减小了TiO2的禁带能隙，从而使TiO2的吸收带发生红移，实现可见光响应。     

纳米V2O5薄膜的制备与特性

采用溶胶.凝胶法在Si和普通玻璃基底上制备V2O5纳米薄膜.在空气中对样品进行不同温度的退火处理.利用X射线衍射、扫描电子显微镜和分光光度计对制备的V2O5薄膜的结构、形貌和光学特性进行研究.XRD和SEM研究结果表明:可以通过升高退火温度来提高薄膜的结晶程度、颗粒尺寸及其均匀程度,并增强V2O5的择优取向性.透射谱和吸收谱的研究结果表明:随着退火温度的升高,V2O5薄膜的吸收边缘发生红移,光学带隙逐渐变窄.     

含纳米V2O5颗粒钒催化剂的制备

介绍了1种制备纳米钒催化剂的新方法。用TEM，SEM，XRD，DSC等手段研究了纳米V2O5溶胶．凝胶，以及活性组分V2O5颗粒在钒催化剂中的形貌、大小和分布等。试验结果表明，随着水钒比的降低，纳米V2O5颗粒的形状由针状、椭球状向球状变化：制备纳米V2O5溶胶．凝胶适宜的熔化工艺参数为800℃～860℃，15min～lOmin。采用本工艺方法制备出了含粒径为30nm～60nm的纳米V2O5溶胶-凝胶和纳米钒催化剂。     

Preparation and oxygen-sensing properties of TiO2 porous thin films on alumina substrate

The titanium dioxide sols were synthesized with tetrabutyl titanate as precursor, diethanolamine（DEA） as complexing agent , polyethylene glycol （PEG） as organic template. The porous films were prepared by sol-gel method, The structures and morphology of the titanium dioxide porous films were characterized by FE-SEM. The formation mechanism of TiO2 porous films and the relation between the porous structure and oxygen-sensing properties of TiO2 films were studied. Ordered structure was formed by assembling between TiO2 colloid particles and the template molecules. PEG molecules acted on TiO2 colloid particles by hydrogen bond and bridge oxygen. The porous structure was formed after the organic template was decomposed when calcining the films. The diameter, amount and distribution of the pores in the films are related with the content of PEG. The pore diameter increases with increasing of content of PEG and the pore density reaches the maximum at certain content. Oxygen-sensitivity and response speed of porous TiO2 films are improved compared with films without pores. Both the sensitivity and response speed increase with the increasing of pore diameter and pore density. Oxygen-sensitivity reaches 3 order of magnitude at 800 ℃. Its response time from H2/N2 to O2/N2 atmosphere and vice versa is about 0.11 s and 0.12 s respectively. Although the sensitivity and response speed increase, the resistance-temperature properties of porous films are not notably improved with the increasing of the content of PEG.     

Effect of sputtering pressure and rapid thermal annealing on optical properties of Ta2O5 thin films

Ta2O5 thin films were deposited by DC reactive magnetron sputtering followed by rapid thermal annealing(RTA). Influence of sputtering pressure and annealing temperature on surface characteristics, microstructure and optical property of Ta2O5 thin films were investigated. As-deposited Ta2O5 thin films are amorphous. It takes hexagonal structure (δ-Ta2O5) after being annealed at 800 ℃. A transition from δ-Ta2O5 to orthorhombic structure (L-Ta2O5) occurs at 900-1 000 ℃. Surface roughness is decreased after annealing at low temperature. Refractive index and extinction coefficient are decreased when annealing temperature is increased.     

Antimicrobial properties of diamond-like carbon-silver-platinum nanocomposite thin films

Silver and platinum were incorporated within diamond-like carbon (DLC) thin films using a multicomponent target pulsed laser deposition process. Transmission electron microscopy of the DLC-silver and DLC-platinum composite films reveals that these films self-assemble into particulate nanocomposite structures that possess a high fraction of sp ³-hybridized carbon atoms. Nanoindentation testing of DLC-silver nanocomposite films demonstrates that these films possess hardness and Young’s modulus values of approximately 35 and 350 GPa, respectively. DLC-silver-platinum films demonstrated exceptional antimicrobial properties against Staphylococcus and Pseudomonas aeruginosa bacteria. This paper was presented at the International Symposium on Manufacturing, Properties, and Applications of Nanocrystalline Materials sponsored by the ASM International Nanotechnology Task Force and TMS Powder Materials Committee on October 18–20, 2004 in Columbus, OH.     

磁控溅射TiO2薄膜的相结构转变温度

利用射频磁控溅射制备了TiO2致密薄膜,并通过退火处理实现TiO2的相转变,采用扫描电镜,X射线衍射等手段对薄膜相结构进行表征并做了详细的分析,结果表明,退火后TiO2薄膜结构致密,表面呈现出大小均匀的纳米晶粒。400 ℃退火时,TiO2薄膜为单一的锐钛矿相,500～600 ℃退火时为锐钛矿和金红石混合相,700 ℃以上退火时则完全转变为金红石相。     

溶胶-凝胶法制备TiO2-SiO2系亲水性薄膜的研究

采用溶胶-凝胶(sol-gel)法在陶瓷釉面砖表面制备了TiO2-SiO2系亲水性薄膜.利用XRD、AFM、FTIR、热显微镜润湿角测角仪等,研究了SiO2添加量对薄膜的微结构和亲水性等的影响.结果表明:薄膜中TiO2晶粒尺寸随着SiO2含量的增加而减小;TiO2和SiO2分别单独成相,并有Ti-O-Si键形成,存在部分复合氧化物,在光照条件下,由于取代反应,复合氧化物的表面易形成Lewis酸,薄膜表面吸附的羟基含量增多且稳定,SiO2摩尔分数为0.4时,润湿角小于5°,薄膜的超亲水状态可在停止光照后长时间存在.     

Photoluminescence properties of ZnSe/SiO2 composite thin films prepared by sol-gel method

ZnSe/SiO2 composite thin films was prepared by sol-gel method. XRD results indicate the phase structure of ZnSe particles embedded in ZnSe/SiO2 composite thin films is sphalerite （cubic ZnS）. Spectroscopic ellipsometers were used to investigated the dependences of ellipsometric angle with wavelength of ZnSe/SiO2 composite thin films. The optical constant, thickness, porosity and the concentration of ZnSe of ZnSe/SiO2 thin composite films were fitted according to Maxwell-Garnett effective medium theory. The thickness of ZnSe/SiO2 composite thin thin films was also measured through surface profile. The photoluminescence properties of ZnSe/SiO2 thin composite thin films was investigated through fluorescence spectrometer. The photoluminescence results show that the emission peak at 487 nm （2.5 eV） is excited at 395 nm corresponds to the band-to-band emission of sphalerite ZnSe crystal（2.58 eV）. The strength free exciton emission and other emission peaks correlating to ZnSe lattice defect were also observed.     

Effects of ZrO2 on the structure and magnetic properties of CoPt thin films

[CoPt 1.5 ml/ZrO2 xnm]10 multilayer films were deposited on glass substrates by magnetron sputtering and then annealed in vacuum at 600℃ for 30 min. Their structures and magnetic properties were investigated as a function of ZrO2 content. The results show that the grain size and coercivity first increase and then decrease with the increase in ZrO2 content. The maximum coercivity and grain size are obtained at 37 vol.% of ZrO2. The content of ZrO2 in the film plays an important role in the separation of CoPt grains and in the reduction of intergrain exchange interaction. On the basis of the studies of angular dependent coercivity, it is found that the magnetization reversal of CoPt films with （111 ） texture is different from either the domain wall motion or the S-W type of rotation mode.     

光学级金刚石自支撑膜及其镀制Y2O3增透膜后的高温抗氧化性

为了提高金刚石膜的红外透过率和高温抗氧化性能,采用纯钇(Y)金属靶,使用直流反应磁控溅射法在光学级金刚石自支撑膜表面制备了Y2O3薄膜.对比研究了光学级金刚石自支撑膜和Y2O3/Diamond/Y2O3复合窗口的高温抗氧化性能,及氧化前后样品表面形貌和红外透过率的变化情况.热分析、扫描电子显微镜和傅立叶变换红外光谱仪的研究结果表明Y2O3薄膜对光学级金刚石膜有非常好的抗氧化防护性能,在高达950℃的温度暴露30s后对光学级金刚石膜表面没有造成明显损伤,且仍能保持良好的增透效果(透过率超过80%).