磁控反应溅射制备钇掺杂TiO_2薄膜的研究

采用混合靶直流磁控反应溅射法,在玻璃基体上溅射沉积了含有氧化钇的TiO2薄膜.X-射线光电子能谱分析结果表明,薄膜是由Y2O3和TiO2复合氧化物组成的.钇的存在会抑制薄膜中二氧化钛晶体的形成.薄膜的紫外可见光谱透射率略有下降,而反射率有所增加.钇的掺杂对二氧化钛薄膜的光催化活性起负作用,光催化降解甲基橙反应的活性随钇含量的增加而下降.     

Photocatalytic Decomposition of Formic Acid Under Visible Light Irradiation Over V-ion-implanted TiO2 Thin Film Photocatalysts Prepared on Quartz Substrate by Ionized Cluster Beam (ICB) Deposition Method

Unique visible-light-responsive TiO₂ photocatalysts (λ>450 nm) were successfully developed by implantation of V ions into the TiO₂ thin films prepared on a quartz substrate by an ionized cluster beam (ICB) deposition method. After V ions implantation into TiO₂ thin film, the photocatalytic activity of the thin films for the decomposition of formic acid into CO₂ and H₂O was found to proceed efficiently under visible light irradiation longer than 450 nm. The TiO₂ thin film photocatalysts were characterized by XRD, UV-vis, XPS, FE-SEM and AFM.     

磁控溅射法制备纳米Cu薄膜及其微结构的研究

采用磁控溅射法制备出以ITO为基底的纯Cu薄膜,考察溅射时间和基底温度等工艺条件对生长Cu薄膜的影响.用电子扫描显微镜(SEM)、X射线衍射仪(XRD)对薄膜的形貌、厚度和结构进行表征.实验结果表明:在一定范围内调控衬底温度和溅射时间,可获得不同形貌、尺寸和厚度的Cu薄膜,所得薄膜的晶体结构为面心立方结构,均沿(111...     

二氧化钛薄膜的制备及光催化性能研究

通过液相沉积法(LPD)在玻璃片表面制备TiO2薄膜,并以甲基橙溶液为污染液,通过探讨制备TiO2薄膜原料的摩尔比例、诱导晶、沉积温度及时间,以及热处理温度及光照时间等因素对甲基橙溶液降解率的影响,得出最佳的降解条件.研究得出:(NH4)2TiF6与H3BO3摩尔比例为1∶1～1∶6,TiO2诱导晶为0～0.1g,沉积温度为25～65℃和沉积时间24h范围内,最佳降解条件为:摩尔比为1∶6,诱导晶为0.06g,沉积温度为55℃,550℃热处理,适当的沉积及光照时间.     

工艺因素对磁控溅射法制备钛酸锶钡薄膜性能的影响

磁控溅射技术在薄膜制备领域有着广泛的应用.本文在介绍磁控溅射法制备薄膜材料的基本原理和流程基础之上,详细分析了溅射工艺参数(溅射功率、温度、溅射气压、氧分压)对BST薄膜性能的影响,并提出了研究中需要解决的一些问题.     

Synthesis of Nanowire TiO2 Thin Films by Hydrothermal Treatment and their Photoelectrochemical Properties

Nanowire TiO₂ thin films were successfully prepared on Ti metal substrates by hydrothermal treatment of calcined Ti foils in 10 M NaOH. The nanowire TiO₂ thin films exhibited much larger surface area and higher photoelectrochemical performance than the TiO₂ thin films prepared on Ti metal substrates by the calcination of Ti foil. These nanowire films were shown to act as an efficient photoanodes for the photoelectrochemical water splitting reaction.     

可见光催化分解水制氢的研究进展

阐述了近五年来可见光催化分解水制氢的国内外最新研究进展。重点介绍了离子掺杂型光催化剂、价带控制型光催化剂、固溶体催化剂、Z型体系光催化剂、复合型光催化剂以及一些新型可见光催化剂。对今后可见光催化分解水制氢的研究工作进行了展望。     

InSb-added TiO2 nanocomposite films by RF sputtering

This study investigates the preparation of InSb-added TiO₂ nanocomposite films by RF sputtering. The optical absorption spectra are obviously shifted to visible and near-infrared regions. High-resolution transmission electron microscopy indicates that sphere-shaped InSb nanocrystals with a size of about 15 nm are dispersed in a matrix. The X-ray diffraction result reveals that the matrix forms a phase mixture of TiO₂ and In₂O₃, which is also produced by decomposing the InSb during postannealing at 723 K. Therefore, the absorption shift is clearly due to quantum size effects of the InSb nanocrystals embedded in the wide-gap oxides TiO₂ and In₂O₃.     

Photocatalytic Degradation of Organic Pollutants Under Visible Light Irradiation

Several TiO₂-based photocatalytic systems that have considerable visible light response have been developed, such as the photodegradation of organic pollutants on sensitized TiO₂ by visible light, construction of visible-light-active novel TiO₂ photocatalysts by matrix or surface modification. In this paper, we review briefly our recent progress in the TiO₂ photocatalytic degradation of organic pollutants by visible light, some related work by other groups is also involved.     

Photocatalytic decomposition of acetic acid on TiO2

During room‐temperature transient experiments, acetic acid decomposes photocatalytically on TiO₂ in an inert atmosphere by two parallel pathways. One pathway forms CO₂ and C₂H₆ in a 2:1 ratio, and H₂O forms with lattice oxygen that was extracted from the surface. The other pathway forms CO₂ and CH₄ in a 1:1 ratio. This revised version was published online in July 2006 with corrections to the Cover Date.     

PEG对二氧化钛薄膜微观结构和光催化性能的影响

用聚乙二醇(PEG)1000作为添加剂,采用溶胶-凝胶法制备了二氧化钛薄膜,通过改变PEG的含量得到不同微观结构的薄膜,进而研究了PEG的含量对二氧化钛薄膜光催化性能的影响.实验结果表明:在30 mL钛溶液中加入O g、O.3 g、O.6 g和0.9 g(PEG) 1000制备的薄膜中均主要含有锐钛矿型二氧化钛晶粒,其中溶胶中加入0.6g(PEG) 1000制成的TiO2多孔薄膜孔穴均匀分布,薄膜的表面平均粗糙度为9.11 nm,光催化性能最高,在180 min内对罗丹明B的降解率达到90.6％.     

溶胶-凝胶法制备掺杂银的TiO2薄膜与光催化性能的研究

论述了用溶胶—凝胶法在普通钠钙硅玻璃基片涂单一的TiO2膜和掺银的TiO2膜的工艺过程．探讨了热处理过程膜结构的转化、影响膜质量的各种工艺因素，并对两种膜的光催化性能做了比较。结果表明：适当选择涂液成分、热处理温度，可以在普通玻璃基片上制备性能优良的膜层，其掺银膜层的光催化性能优于单一的TiO2膜，而且膜层化学稳定性和强度都较高。     

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。     

磁控溅射偏压对Cr薄膜密度以及表面形貌的影响

利用磁控溅射技术,在不同偏压条件下在Si(001)基底上沉积了金属Cr薄膜样品。用同步辐射装置对样品进行了X-射线反射率测试,采用X-射线反射率分析法研究了不同偏压下Cr薄膜密度的变化。发现当偏压小于300 V时,偏压对所沉积的薄膜起到紧致的效果,偏压为300 V时薄膜密度最大;当偏压大于300 V时,薄膜密度减小。另外,为了探究偏压对薄膜表面形貌的影响,用扫描电子显微镜对各样品进行了表面分析,发现在偏压较小时薄膜表面较为平整;随着偏压增大,表面呈现界面分明的岛状分布。     

Photocatalytic Properties of Silica-supported TiO2

TiO₂ supported on SiO₂ surface is effective on the recovery of photocatalyst, morphological control, and coating on the substrate. Furthermore, it shows much higher photocatalytic activity than pure TiO₂. The silica support is quite influential on the surface properties of TiO₂ supported on SiO₂. The enhanced photocatalytic activity of TiO₂–SiO₂ could be explained by the effects of surface area, adsorption, band-gap energy and local structure. However, it is difficult to say which one is the most important factor responsible for the photocatalytic property of TiO₂–SiO₂. For example, the reduction of particle size could effect on both of the surface area and band-gap energy. And, Ti–O–Si bonds could modify the band-gap energy and local structure. Therefore, the photocatalytic properties of TiO₂–SiO₂ should be expressed by sum of many factors such as surface area, adsorption, band-gap energy and local structure.     

The Effect of Chemical Etching by HF Solution on the Photocatalytic Activity of Visible Light-responsive TiO2 Thin Films for Solar Water Splitting

The effect of chemical etching by HF solution on the photoelectrochemical performance and photocatalytic activity of visible light-responsive TiO₂ (Vis-TiO₂) thin films prepared by a radio-frequency magnetron sputtering method has been investigated. It was found that Vis-TiO₂ thin films treated with HF solution (HF-Vis-TiO₂) exhibit a remarkable enhancement of the photoelectrochemical performance not only under UV but also visible light irradiation as compared to untreated Vis-TiO₂. The incident photon to current conversion efficiencies reached 66 and 9.4% under UV (λ = 360 nm) and visible light (λ = 420 nm), respectively. The HF-Vis-TiO₂ thin films have a larger surface area and higher donor density than Vis-TiO₂, indicating that the remarkable increase in the photocurrent may be due to the short diffusion length of the photoformed holes in reaching the solid–liquid interface as well as to the high conductivity. Moreover, the HF-Vis-TiO₂ thin films were found to act as efficient photocatalysts for the decomposition of water with the separate evolution of H₂ and O₂ from H₂O under visible or sunlight irradiation.     

ITO薄膜射频磁控溅射法制备及性能研究

以10%SnO2和90%In2O3(以质量计)烧结成的ITO氧化物陶瓷为靶材,采用射频磁控溅射法在玻璃基片成功地制备出光电性能优异的ITO透明导电薄膜。研究了基片温度和氧分压溅射工艺参数对ITO薄膜的结构和光电性能的影响。实验结果表明,采用氧化铟锡陶瓷靶射频磁控溅射制备的ITO薄膜沿(222)晶面生长,薄膜紫外透射光谱的吸收截止边带随着衬底温度和氧分压的升高向短波长方向漂移。     

High Efficiency Photocatalytic Mineralization of C.I. Reactive Red 2 using Transparent Self-Assembled Nanopin-Like Titania with High Preferential (101) Orientation on Alumina Thin Film in Aqueous Environments

This investigation elucidated the mineralization of an environmental pollutant; C.I. Reactive Red 2 (RR2) using transparent self-assembled nanopin-like titania with high preferential (101) orientation on alumina thin film (Ti@Al-nanopin-f) in water and UV/TiO₂ system. Mineralization efficiency of the azo dye by Ti@Al-nanopin-f thin film is compared with a thick film of Degussa P25 titania photocatalyst (P25-f) and a dense thin film of titania on a glass substrate (Ti-f). The results shown high efficiency of fully mineralization of RR2 by titania nanopin thin film. The decolorization reactions obeyed the pseudo-first-order kinetics in all tested systems. The photodegradation rates of chemical compounds on semiconductor surfaces follow the Langmuire-Hinshelwood model. At pH 7, the mineralization rates followed the order Ti@Al-nanopin-f (k = 0.066 min^?1 and t_1/2 = 10.5 min) > P25-f (k = 0.0125 min^?1 and t_1/2 = 55.4 min) > Ti-f (k = 0.0042 min^?1 and t_1/2 = 165.0 min). High preferential (101) orientation of the anatase particles on alumina substrate not only markedly increase the surface area but also prepare a suitable sites for electron and hole injection to species of solution.     

Size Effect in Hybrid TiO2:Au Nanostars for Photocatalytic Water Remediation Applications

TiO₂:Au-based photocatalysis represents a promising alternative to remove contaminants of emerging concern (CECs) from wastewater under sunlight irradiation. However, spherical Au nanoparticles, generally used to sensitize TiO₂, still limit the photocatalytic spectral band to the 520 nm region, neglecting a high part of sun radiation. Here, a ligand-free synthesis of TiO₂:Au nanostars is reported, substantially expanding the light absorption spectral region. TiO₂:Au nanostars with different Au component sizes and branching were generated and tested in the degradation of the antibiotic ciprofloxacin. Interestingly, nanoparticles with the smallest branching showed the highest photocatalytic degradation, 83% and 89% under UV and visible radiation, together with a threshold in photocatalytic activity in the red region. The applicability of these multicomponent nanoparticles was further explored with their incorporation into a porous matrix based on PVDF-HFP to open the way for a reusable energy cost-effective system in the photodegradation of polluted waters containing CECs.