07December2019

Nano-Micro Letters

Laser-Etched Stretchable Graphene-Polymer Composite Array for Sensitive Strain and Viscosity Sensors

Yuting Jiang1, 4, ‡, Yang Wang1, ‡, Heting Wu1, 4, Yuanhao Wang2, *, Renyun Zhang3, Håkan Olin3, Ya Yang1, 4, 5, *

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Nano-Micro Lett. (2019) 11: 99

First Online: 16 November 2019 (Article)

DOI:10.1007/s40820-019-0333-6

*Corresponding author. E-mail: wangyh@ms.xjb.ac.cn (Yuanhao Wang); yayang@binn.cas.cn (Ya Yang)

 

Abstract

 


Toc

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 μm2/%. The proposed laser-etched stretchable graphene-polymer composite has potential applications in DNA microarrays, biological assays, soft robots and so on.


 

Keywords

Hydrophobic smart coatings; Flexible sensors; Soft materials; Controlled drops; Graphene

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