Journal
NANO-MICRO LETTERS
Volume 11, Issue 1, Pages -Publisher
SHANGHAI JIAO TONG UNIV PRESS
DOI: 10.1007/s40820-019-0333-6
Keywords
Hydrophobic smart coatings; Flexible sensors; Soft materials; Controlled drops; Graphene
Funding
- National Key R&D Program of China [2016YFA0202701]
- National Natural Science Foundation of China [51472055, 61404034]
- External Cooperation Program of BIC, Chinese Academy of Sciences [121411KYS820150028]
- 2015 Annual Beijing Talents Fund [2015000021223ZK32]
- University of Chinese Academy of Sciences [Y8540XX2D2]
- thousands talents program for the pioneer researcher and his innovation team, China
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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 mu m(2)/%. The proposed laser-etched stretchable graphene-polymer composite has potential applications in DNA microarrays, biological assays, soft robots, and so on.
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