Triboelectric Nanogenerators Based on Super-Stretchable Conductive Hydrogels with the Assistance of Deep-Learning for Handwriting Recognition

Nowadays, wearable electronic devices are developingrapidly withthe internet of things and human-computer interactions. However,there are problems such as low power, short power supply time, anddifficulty in charging, leading to a limited range of practical applications.In this paper, a composite hydrogel composed of polyacrylamide, hydroxypropylmethylcellulose, and MXene (Ti3C2T x ) nanosheets was developed, which formed a stabledouble-chain structure by hydrogen bonding. The configuration endowsthe hydrogel with excellent properties, such as high strength, strongstretchability, excellent electrical conductivity, and high strainsensitivity. Based on these characteristics, a flexible multifunctionaltriboelectric nanogenerator (PHM-TENG) was prepared using thehydrogel as a functional electrode. The nanogenerator can collectbiomechanical energy and convert it to 183 V with a maximum powerdensity of 78.3 mW/m(2). It is worth noting that PHM-TENGcan be applied as a green power source for driving miniature electronics.Also, it can be used as an auto-powered strain sensor that distinguishesletters, enabling monitoring under small strain conditions. This workis anticipated to provide an avenue for the development of new intelligentsystems for handwriting recognition.

Automated summary

In this paper, a composite hydrogel composed of polyacrylamide, hydroxypropylmethylcellulose, and MXene (Ti3C2Tx) nanosheets was developed, which formed a stable double-chain structure by hydrogen bonding. Based on the excellent properties of the hydrogel, a flexible and multifunctional triboelectric nanogenerator (PHM-TENG) was prepared, which can collect biomechanical energy and convert it to 183 V with a maximum power density of 78.3 mW/m(2). This work holds great potential in providing a green power source for miniature electronics and developing intelligent systems for handwriting recognition.