@article{Shen_Yi_Sun_Guo_He_Ma_Li_Fu_Lee_Wang_2022, title={Human Machine Interface with Wearable Electronics Using Biodegradable Triboelectric Films for Calligraphy Practice and Correction}, volume={14}, url={https://nmlett.org/index.php/nml/article/view/1223}, DOI={10.1007/s40820-022-00965-8}, abstractNote={<p>Letter handwriting, especially stroke correction, is of great importance for recording languages and expressing and exchanging ideas for individual behavior and the public. In this study, a biodegradable and conductive carboxymethyl chitosan-silk fibroin (CSF) film is prepared to design wearable triboelectric nanogenerator (denoted as CSF-TENG), which outputs of <em>V</em><sub>oc</sub> ≈ 165&nbsp;V, <em>I</em><sub>sc</sub> ≈ 1.4 μA, and <em>Q</em><sub>sc</sub> ≈ 72 mW cm<sup>−2</sup>. Further, in vitro biodegradation of CSF film is performed through trypsin and lysozyme. The results show that trypsin and lysozyme have stable and favorable biodegradation properties, removing 63.1% of CSF film after degrading for 11&nbsp;days. Further, the CSF-TENG-based human–machine interface (HMI) is designed to promptly track writing steps and access the accuracy of letters, resulting in a straightforward communication media of human and machine. The CSF-TENG-based HMI can automatically recognize and correct three representative letters (F, H, and K), which is benefited by HMI system for data processing and analysis. The CSF-TENG-based HMI can make decisions for the next stroke, highlighting the stroke in advance by replacing it with red, which can be a candidate for calligraphy practice and correction. Finally, various demonstrations are done in real-time to achieve virtual and real-world controls including writing, vehicle movements, and healthcare.</p> <p>Highlights:</p> <p>1 A wearable triboelectric nanogenerator (denoted as CSF-TENG) is designed using biodegradable and carboxymethyl chitosan-silk fibroin (CSF) film.<br>2 In vitro biodegradation of CSF film is performed through trypsin and lysozyme. 63.1% of CSF film is removed by trypsin and lysozyme after degrading for 11 days.<br>3 An intuitive writing system is designed by CSF-TENGs-based human-machine interface to promptly track writing steps, highlight the stroke in advance, and access the accuracy of letters.</p>}, journal={Nano-Micro Letters}, author={Shen, Shen and Yi, Jia and Sun, Zhongda and Guo, Zihao and He, Tianyiyi and Ma, Liyun and Li, Huimin and Fu, Jiajia and Lee, Chengkuo and Wang, Zhong Lin}, year={2022}, month={Nov.}, pages={225} }