锌基润湿性及形貌可控的电沉积薄膜

发布时间：2018-11-08 19:53

【摘要】：润湿性是固体表面的重要性质之一,也是决定材料应用价值的重要性质。表面润湿性与表面化学组成和表面微观结构密切相关。超疏水超亲水可逆转换表面由于其独特的性能,在自清洁、生物材料、传感器、喷墨印刷、智能微流体、可控药物传输和芯片实验等方面的应用前景,吸引了国内外广泛的关注。ZnO因其与众不同的物理和化学性质成为构建功能电子器件的理想材料之一。ZnO的特性和性能随它的形状、尺寸、生长方向和密度而改变。因此,开发制备可控形貌ZnO的实验方法对于开阔其应用潜力是非常必要的。智能可控润湿性及形貌的薄膜表面在化学、生物、电子和微流体应用方面可能有应用前景。主要研究内容及创新性结果如下:(1)通过盐酸刻蚀、电沉积ZnO薄膜和退火处理成功制备具有微纳米复合结构的超疏水表面。在电压-1.25 V下电沉积900 s,然后200°C下退火60 min可在锌基底上制备得到最优化超疏水表面,其最大接触角达170±2°并具备超低的滚动角约0°。通过SEM和CA结果分析,我们发现样品表面的形貌和润湿性可以通过制备过程控制。在不同的电化学实验条件下制备的样品(包括5 mM~40 mM Zn(CH3COO)2,300s~1500 s电沉积时间)都具备超疏水性。详尽地研究了刻蚀时间、Zn(CH3COO)2溶液浓度、电沉积时间、退温度和退火时间对表面润湿性行为的影响。(2)采用接触角测量仪(CA)、X射线衍射仪(XRD)、X射线光电子能谱仪(XPS)以及扫描电子显微镜(SEM)对超疏水表面的润湿性、化学组成和形貌进行表征,探索超疏水表面的反应机理和超疏水原理。(3)对超疏水表面进行了环境稳定性和电化学测试。实验结果表明,超疏水表面具备优良的环境稳定性、自清洁能力和抗腐蚀能力。此外,研究了ZnO超疏水表面的防冰冻能力。此种表面薄膜可通过紫外照射和黑暗环境放置或者退火交替处理实现超疏水超亲水快速可逆转换。
[Abstract]:Wettability is one of the important properties of solid surface, and it also determines the application value of materials. Surface wettability is closely related to surface chemical composition and surface microstructure. The superhydrophobic super-hydrophilic reversible conversion surface, due to its unique properties, has a wide range of applications in self-cleaning, biomaterials, sensors, inkjet printing, intelligent microfluids, controllable drug transport and chip experiments. ZnO is one of the ideal materials for building functional electronic devices because of its unique physical and chemical properties. The characteristics and properties of ZnO vary with its shape, size, growth direction and density. Therefore, it is necessary to develop an experimental method for the preparation of controllable morphologies ZnO in order to broaden its application potential. Intelligent controllable wettability and morphology of the film surface in chemical, biological, electronic and microfluid applications may have a bright future. The main research contents and innovative results are as follows: (1) the superhydrophobic surface with micro / nano composite structure was successfully prepared by hydrochloric acid etching electrodeposition of ZnO thin films and annealing. The optimized superhydrophobic surface can be prepared on zinc substrate at -1.25 V for 900s and then annealed at 200 掳C for 60 min. The maximum contact angle is 170 卤2 掳and the rolling angle is about 0 掳. By SEM and CA analysis, we found that the surface morphology and wettability of the samples can be controlled by the preparation process. The samples prepared under different electrochemical conditions (including 5 mM~40 mM Zn (CH3COO) 2300s~1500 s electrodeposition time were superhydrophobic. The effects of etch time, Zn (CH3COO) 2 solution concentration, electrodeposition time, annealing temperature and annealing time on the wettability of the surface were investigated in detail. (2) the contact angle measurement (CA), X ray diffractometer (XRD),) was used to measure the wettability of the surface. The wettability, chemical composition and morphology of superhydrophobic surface were characterized by X-ray photoelectron spectroscopy (XPS) and scanning electron microscope (SEM). The reaction mechanism and superhydrophobic principle of superhydrophobic surface were explored. (3) the environmental stability and electrochemical test of superhydrophobic surface were carried out. The experimental results show that the superhydrophobic surface has excellent environmental stability, self-cleaning ability and corrosion resistance. In addition, the freezing resistance of ZnO superhydrophobic surface was studied. The superhydrophobic superhydrophilic and hydrophilic fast reversible conversion can be realized by UV irradiation, dark environment placement or annealing alternately.
【学位授予单位】：北京理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TB383.2

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