Poly(vinyl alcohol), Tannic Acid, and Silver-Based Hydrogel Strain Sensors with “Fish Scale-Like” Surfaces
Source abstract
Abstract
Skin-like soft conductive hydrogels with intrinsic mechanical flexibility exhibit promising potential as flexible electrical sensors. However, dilemmas remain regarding their electrical conductivity and fragile nature. Herein, a method including freeze-drying and rehydration of hydrogels to optimize the abovementioned properties is proposed. Poly(vinyl alcohol)-based conductive hydrogels are fabricated by freeze-drying and rehydration of prehydrogels in AgNO 3 solution, which results in densified polymer networks along with a “fish scale-like” surface consisting of inorganic materials originating from spontaneously interconnected Ag nanoparticles (AgNPs) on the exterior surface of hydrogels. The densified polymer networks dramatically improve the mechanical properties, while the AgNPs serve as electron transfer carriers for high electrical conductivity. Consequently, the prepared hydrogels realize 20 times improvement in both strength (3 MPa) and toughness (2.12 MJ/m 3 ) along with ideal electrical conductivity (3.98 mS/cm) and strain sensitivity (GF = 4.12). The obtained conductive hydrogels can serve as strain sensors to monitor human motions and exhibit desirable antibacterial properties.
Source: openalex_inverted_index · Quality: baseline
Research context
OpenAlex topics: Advanced Sensor and Energy Harvesting Materials · Conducting polymers and applications · Advanced Materials and Mechanics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Key Laboratory of Photovoltaic and Energy Conservation Materials, Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, People’s Republic of China
University of Science and Technology of China, Hefei 230026, People’s Republic of China
Department of Chemistry and Chemical Engineering, Hefei Normal University, Hefei 230061, People’s Republic of China
Anhui Institute of Innovation for Industrial Technology, Hefei 230088, Anhui, People’s Republic of China
Funding
Hefei Institutes of Physical Science, Chinese Academy of Sciences · Anhui Provincial Department of Education · Youth Innovation Promotion Association · Major Science and Technology Projects in Anhui Province · Key Laboratory of Photovoltaic and Energy Conservation Materials · Hefei Normal University · Open Foundation of sports and health monitoring technology center of Anhui Province · Education quality project · Anhui Province Key Laboratory of Environment-friendly Polymer Materials
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