Graphdiyne-Based Nanofilms for Compliant On-Skin Sensing

• Published in: ACS Nano Vol. 16; no. 10; pp. 16677 - 16689
• Main Authors: Cai, Yichen, Shen, Jie, Fu, Jui-Han, Qaiser, Nadeem, Chen, Cailing, Tseng, Chien-Chih, Hakami, Mariam, Yang, Zheng, Yen, Hung-Ju, Dong, Xiaochen, Li, Lain-Jong, Han, Yu, Tung, Vincent
• Format: Journal Article
• Language: English
• Published: United States American Chemical Society 25.10.2022; American Chemical Society (ACS)
• Subjects: Conductive Graphdiyne Nanofilms; Conformal E-skin Sensors; Electric Conductivity; Graphite; Graphite - chemistry; Humans; Hydrogen; Strain And Temperature Sensing; Subtle Deformation Detection; Wearable Electronic Devices; Wearable Organic Bioelectronic; conformal e-skin sensors; subtle deformation detection; wearable organic bioelectronic; conductive graphdiyne nanofilms; strain and temperature sensing
• ISSN: 1936-0851; 1936-086X; 1936-086X
• DOI: 10.1021/acsnano.2c06169

Thin-film electronics pliably laminated onto the epidermis for noninvasive, specific, and multifunctional sensing are ideal wearable systems for health monitoring and information technologies. However, it remains a critical challenge to fabricate ultrathin and compliant skin-like sensors with high imperceptibility and sensitivities. Here we report a design of conductive hydrogen-substituted graphdiyne (HsGDY) nanofilms with conjugated porous structure and inherent softness for on-skin sensors that allow minimization of stress and discomfort with wear. Dominated by the subtle deformation-induced changes in the interdomain tunneling conductance, the engineered HsGDY sensors show continuous and accurate results. Real-time noninvasive spatial mapping of dynamic/static strains in both tensile/compressive directions monitors various body motions with high sensitivity (GF ∼22.6, under 2% strain), fast response (∼60 ms), and long-term durability (∼5000 cycles). Moreover, such devices can dynamically distinguish between the temperature difference and frequency of air inhaled and exhaled through the nostril, revealing a quantitative assessment of the movement/health of the human body. The proof-of-concept strategy provides an alternative route for the design of next-generation wearable organic bioelectronics with multiple electronic functionalities.