Innovative fabrication of skin-interfaced bioelectronics for multimodal health monitoring
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Skin-interfaced wearable electronics capable of real-time monitoring of vital biophysiological signals have gained significant attention. However, traditional wearable devices often face challenges such as the use of costly materials, intricate fabrication processes, and poor stability under mechanical stress and prolonged wear. Moreover, the limited breathability of substrates can compromise comfort and cause inflammation over long-term use. My research primarily addresses these challenges by innovating materials, adapting fabrication technologies, and modifying devices to enhance breathability, stretchability, affordability, and other unique characteristics essential for on-skin wearables. The dissertation starts from the development of cost-effective, eco-friendly, and breathable wearable electronics. Direct writing technique to apply conductive graphite patterns onto cellulose paper, facilitating the development of on-skin electronics (chapter 1). Then laser-scribed molybdenum dioxide (LSM) with high electrical conductivity, biocompatibility, chemical stability, and MRI compatibility.is developed to achieve mask-free, high-resolution, and large-scale fabrication of highly conductive materials on flexible substrates and Janus devices capable of monitoring both bodily and environmental signals (Chapter 2) is also obtained. Using phase-separation technology, we develop porous composites of silver nanowires (Ag NWs) with an ultralow percolation threshold. These composites enable strain-resilient near-field communication (NFC), facilitating wireless powering and data transmission for both skin-interfaced and implantable bioelectronics (Chapter 3). Last work is focus on the engineering cellulose nanofiber interfaces (CNFI) on porous substrates to achieve surface flatness for high-quality bioelectronics printing and to construct mechanical heterogeneity for strain-resilient bioelectronics. Additionally, CNFI for microfluidic channel (MFC) is also constructed for continuous and real-time collection, transportation, and discharge of sweat (Chapter 4).
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Ph. D.