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首页> 外文期刊>Science of advanced materials >Synthesis and Surface Functionalization of SnO_2 Nanoparticles and Their Superhydrophobic Coatings
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Synthesis and Surface Functionalization of SnO_2 Nanoparticles and Their Superhydrophobic Coatings

机译：SnO_2纳米粒子及其超疏水涂层的合成与表面功能化

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摘要

Modulation of surface wettability is demonstrated using SnO_2 nanoparticles (NPs) upon surface functionalization. Quantum sized SnO_2 NPs synthesized by soft chemical route are annealed under ambient conditions at different temperatures to increase grain size as revealed by field emission scanning electron microscopy, transmission electron microscopy, and X-ray diffraction. These NPs were treated in a cyclohexane medium with octadecyltrichlorosilane (OTS) to create an organic/inorganic interface. Atomic force microscopy reveals increased roughness of functionalized films with increasing size of SnO_2 NPs, whereas Raman studies illustrate ordered OTS molecules on SnO_2 surfaces forming a hetero-structure interface. Water contact angle measurements on spin coated plain SnO_2 NPs films show distinct hydrophilic nature with a contact angle (CA) of 15±2°. Creation of an interface with OTS with these films show hydrophobicity with a minimum contact angle of 137° for the quantum sized SnO_2 NPs. Surface wettability is further modulated by introducing enhanced surface roughness with increasing size of SnO_2 NPs and clusters in the OTS treated films. Super hydrophobicity (CA > 150°) is clearly demarcated after silanization of SnO_2 NPs of size of 12 nm and above. Within the frame work of Cassie-Baxter model, super hydrobhobicity is explained based on surface roughness and geometrical architectures.
机译：在表面功能化后，使用SnO_2纳米颗粒（NPs）证明了对表面润湿性的调节。通过场化学扫描电子显微镜，透射电子显微镜和X射线衍射显示，通过软化学途径合成的量子尺寸SnO_2 NPs在环境条件下于不同温度下退火，以增加晶粒尺寸。这些NP在带有十八烷基三氯硅烷（OTS）的环己烷介质中处理，以创建有机/无机界面。原子力显微镜显示功能性薄膜的粗糙度随SnO_2 NPs尺寸的增加而增加，而拉曼研究表明SnO_2表面上形成有异质结构界面的有序OTS分子。在旋涂的普通SnO_2 NPs薄膜上的水接触角测量显示出独特的亲水性，接触角（CA）为15±2°。这些薄膜与OTS形成的界面显示出疏水性，对于量子尺寸的SnO_2 NPs的最小接触角为137°。通过在OTS处理的薄膜中引入随SnO_2 NPs和簇尺寸增加而增加的表面粗糙度，进一步调节表面润湿性。硅烷化尺寸大于等于12 nm的SnO_2 NP后，明显划定了超疏水性（CA> 150°）。在Cassie-Baxter模型的框架内，基于表面粗糙度和几何结构说明了超疏水性。

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