Silver Nanoflower Decorated Graphene Oxide Sponges for Highly Sensitive Variable Stiffness Stress Sensors

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Fakhre Alam KhanSeunghyun Baik

Abstract

Soft conductive materials should enable large deformation while keeping high electrical conductivity and elasticity. The graphene oxide (GO)-based sponge is a potential candidate to endow large deformation. However, it typically exhibits low conductivity and elasticity. Here, the highly conductive and elastic sponge composed of GO, flower-shaped silver nanoparticles (AgNFs), and polyimide (GO-AgNF-PI sponge) are demonstrated. The average pore size and porosity are 114 µm and 94.7%, respectively. Ag NFs have thin petals (8-20 nm) protruding out of the surface of a spherical bud (300-350 nm) significantly enhancing the specific surface area (2.83 m2 g-1 ). The electrical conductivity (0.306 S m-1 at 0% strain) of the GO-AgNF-PI sponge is increased by more than an order of magnitude with the addition of Ag NFs. A nearly perfect elasticity is obtained over a wide compressive strain range (0-90%). The strain-dependent, nonlinear variation of Young's modulus of the sponge provides a unique opportunity as a variable stiffness stress sensor that operates over a wide stress range (0-10 kPa) with a high maximum sensitivity (0.572 kPa-1 ). It allows grasping of a soft rose and a hard bottle, with the minimal object deformation, when attac...Continue Reading

References

Dec 6, 2012·Nature Communications·Ling QiuDan Li
Feb 19, 2013·Advanced Materials·Han HuJieshan Qiu
Mar 26, 2014·Nano Letters·Rujun MaSeunghyun Baik
Apr 15, 2016·Nanoscale·Sungwoo ChunWanjun Park
May 10, 2017·ACS Applied Materials & Interfaces·Jongju YunSeunghyun Baik
Sep 14, 2017·Nanotechnology·Shrawan RoyJeongyong Kim

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Citations

Jan 18, 2019·Physical Chemistry Chemical Physics : PCCP·Daewoo SuhSeunghyun Baik
Apr 5, 2021·Materials Science & Engineering. C, Materials for Biological Applications·Madalina TudoseDiana Iulia Savu

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