基于石墨稀疏水自清洁表面的构筑与研究

发布时间：2018-07-27 13:43

【摘要】：石墨烯因其独特的结构及特性在诸多领域均发挥着重要的作用,本论文主要研究表面石墨烯及其复合材料的疏水自清洁性能。通常来说,实现自清洁一般有两种方式：一是构筑超亲水表面,二是构筑超疏水表面。超疏水表面一般指水滴和表面的接触角大于150°并且滚动角小于10°,水滴极易从表面滚落从而实现自清洁。本论文主要研究以化学还原氧化石墨烯为结构单元来构筑超疏水表面,研究内容如下：(1)疏水石墨烯微纳结构表面构筑：首先利用掩膜版曝光制备周期分别为9um、8um、4um的微米基底并采用3-氨丙基三乙氧基硅氧烷(APS)溶液对基底进行氨基化处理,进一步将氧化石墨烯片(GO)自组装在基底上并退火以实现GO与基底的化学键结合,得到的修饰基底用苯胺化学还原GO,再用氟硅烷修饰,从而得到接近超疏水的表面,实验中利用这种方法能够制备出接触角为148.01°,滚动角特别大的表面,这为后续的石墨烯-二氧化钛复合结构自清洁表面的构筑奠定了基础。(2)超疏水石墨烯-二氧化钛微纳结构表面构筑：利用静电自组装的方法制备石墨烯与二氧化钛复合物,通过一系列的测试对比我们发现：与碳纳米管和二氧化钛的复合物相比,石墨烯-二氧化钛复合物构筑的表面具有优异的自清洁功能。纳米二氧化钛的加入能够增加表面的接触角,同时减小滚动角,从而达到真正的超疏水。石墨烯-二氧化钛复合体系中,石墨烯能够拓展二氧化钛的吸收光谱至可见光从而能够光催化分解不溶于水的有机物,以此复合体系构筑出的微纳结构能够达到真正意义上的表面自清洁。
[Abstract]:Graphene plays an important role in many fields because of its unique structure and characteristics. In this paper, the hydrophobic self-cleaning properties of graphene and its composites are studied. Generally speaking, there are two ways to realize self-cleaning: one is to construct superhydrophilic surface, the other is to construct superhydrophobic surface. Superhydrophobic surface generally refers to the contact angle of water droplet and surface is more than 150 掳and the rolling angle is less than 10 掳. Water droplets are easy to roll off the surface and realize self-cleaning. In this thesis, the superhydrophobic surface was constructed by chemical reduction of graphene oxide. The main contents are as follows: (1) Surface construction of hydrophobic graphene microstructures: firstly, the micron substrates with a period of 9umn ~ 8umn ~ 4um were prepared by mask plate exposure, and the substrate was treated with 3-aminopropyl triethoxysiloxane (APS) solution. Furthermore, the (GO) of graphene oxide was self-assembled on the substrate and annealed to achieve the binding of go to the substrate. The modified substrate was chemically reduced by aniline and then modified with fluorosilane to obtain a surface close to superhydrophobic. By using this method, the surface with a contact angle of 148.01 掳and a particularly large rolling angle can be prepared. This laid a foundation for the subsequent construction of self-cleaning surface of graphene titanium dioxide composite structure. (2) Surface construction of superhydrophobic graphene and titanium dioxide microstructures: the composite of graphene and titanium dioxide was prepared by electrostatic self-assembly. Through a series of tests and comparisons we found that the surface constructed by graphene-titanium dioxide composites has excellent self-cleaning function compared with the composites of carbon nanotubes and titanium dioxide. The addition of nano-TiO _ 2 can increase the contact angle of the surface and decrease the rolling angle so that the real superhydrophobic can be achieved. In the graphene-titanium dioxide composite system, graphene can expand the absorption spectrum of titanium dioxide to visible light, so that it can photocatalyze the decomposition of organic matter that is insoluble in water. The micro / nano structure constructed by this composite system can achieve the true self-cleaning of the surface.
【学位授予单位】：苏州大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ127.11

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