Anti-Swelling Zwitterionic Nanocomposite Hydrogels with Biocompatibility as Flexible Sensor for Underwater Application

Zhicheng Jiang1

Ruicheng Sha1

Yunbo He1

Mengshuang Wang1

Wenjing Ma2

Shuting Gao2

Mengni Zhu1

Yue Li1

Mengying Ni1

Min Xu1,*,Email

School of Physics and Electronic Science, East China Normal University, Shanghai, 200241, China

Joint Laboratory of Advanced Biomedical Materials, College of Chemical Engineering, Nanjing Forestry University, Nanjing, 210037, China

Abstract

The increasement of underwater activities has driven the demand for underwater flexible sensor, which can detect various signals from both the human and the environment real-time to improve the work efficiency and ensure the safety. However, the fabrication of underwater sensors remains challenging arising from the swelling of hydrogels in water and non-green of sensors posing a great threat to the user and application environment. Here, the hydrogel-based sensor composed of poly [2-(methacryloyloxy) ethyl] dimethyl-(3-sulfopropyl) ammonium hydroxide and bacterial cellulose nanofibers, featuring self-adhesion, biocompatibility, and anti-swelling behavior, is fabricated through an eco-friendly method. The electrostatic interaction between zwitterionic functional groups (positively charged -R3N+ groups, negatively charged -SO3- groups) endow the hydrogel excellent anti-swelling behavior in aquatic environment. Owing to these characteristics, the hydrogel sensor is capable of monitoring movements in air and underwater environment. Based on the hydrogel sensor, an intelligent communication system is developed to achieve information transmission in water. Moreover, the great biocompatibility of hydrogel sensor highlights its safe for user and environment, manifesting its great promising for electronic skin. As such, the biocompatibility hydrogel sensor with capability of anti-swelling has provided a promising route to promote the development of wearable devices.