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通过在较低碱浓度(0.5~4 mol L-1NaOH或KOH)、较短时间(0.5~7 h)及较低温度(20~80℃)条件下处理钛片,用扫描电镜(SEM)、X射线光电子能谱(XPS)考察了反应温度、碱浓度及时间对所形成薄膜形貌及组成的影响。结果发现,在上述实验条件下,生成薄膜的主要成分是TiO2;随着温度、碱浓度及时间的增加,钛酸盐的含量略有增加;同时在温度较低时,还有少量低价钛氧化物存在。研究结果还表明,低浓度的碱液、低反应温度和短的反应时间有利于形成线状网状结构的薄膜,高浓度的碱液、高反应温度和较长的反应时间有利于形成带状多孔网状结构的薄膜,甚至形成花簇状结构。对TiO2薄膜的形成机制进行了探讨,并从动力学角度解释了生成薄膜的成分是TiO2而非钛酸盐的原因。
Titanium plates were treated with lower alkali concentration (0.5-4 mol L-1 NaOH or KOH), shorter time (0.5-7 h) and lower temperature (20-80 ° C). Scanning electron microscopy (SEM) X-ray photoelectron spectroscopy (XPS) investigated the influence of reaction temperature, alkali concentration and time on the morphology and composition of the formed films. The results showed that under the above experimental conditions, the main component of the film was TiO2. With the increase of temperature, alkali concentration and time, the content of titanate increased slightly. At the same time, Oxide is present. The results also show that the low concentration of lye, low reaction temperature and short reaction time are conducive to the formation of linear network structure of the film, high concentration of lye, high reaction temperature and longer reaction time is conducive to the formation of ribbon Porous network structure of the film, and even the formation of flower-like structure. The formation mechanism of TiO2 thin film was discussed, and the reason why the composition of thin film was TiO2 instead of titanate was explained from the kinetic point of view.