Jiang Yuting, Wang Yang, Wu Heting, Wang Yuanhao, Zhang Renyun, Olin Håkan, Yang Ya
CAS Center for Excellence in Nanoscience, Beijing Key Laboratory of Micro-nano Energy and Sensor, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 100083, People's Republic of China.
School of Nanoscience and Technology, University of Chinese Academy of Sciences, Beijing, 100049, People's Republic of China.
Nanomicro Lett. 2019 Nov 16;11(1):99. doi: 10.1007/s40820-019-0333-6.
The ability to control surface wettability and liquid spreading on textured surfaces is of interest for extensive applications. Soft materials have prominent advantages for producing the smart coatings with multiple functions for strain sensing. Here, we report a simple method to prepare flexible hydrophobic smart coatings using graphene-polymer films. Arrays of individual patterns in the films were created by laser engraving and controlled the contact angle of small drops by pinning the contact lines in a horizontal tensile range of 0-200%. By means of experiments and model, we demonstrate that the ductility of drops is relied on the height-to-spacing ratio of the individual pattern and the intrinsic contact angle. Moreover, the change of drop size was utilized to measure the applied strain and liquid viscosity, enabling a strain sensitivity as high as 1068 μm/%. The proposed laser-etched stretchable graphene-polymer composite has potential applications in DNA microarrays, biological assays, soft robots, and so on.
控制表面润湿性以及液体在纹理表面上的铺展能力在广泛的应用中备受关注。软材料在制备具有应变传感等多种功能的智能涂层方面具有显著优势。在此，我们报道了一种使用石墨烯 - 聚合物薄膜制备柔性疏水智能涂层的简单方法。通过激光雕刻在薄膜中创建单个图案阵列，并在0 - 200%的水平拉伸范围内固定接触线来控制小液滴的接触角。通过实验和模型，我们证明液滴的延展性取决于单个图案的高度与间距之比以及固有接触角。此外，利用液滴尺寸的变化来测量施加的应变和液体粘度，实现了高达1068μm/%的应变灵敏度。所提出的激光蚀刻可拉伸石墨烯 - 聚合物复合材料在DNA微阵列、生物检测、软机器人等方面具有潜在应用。
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