Xi’an – A comprehensive system-level review published in Nano-Micro Letters examines the current state and future potential of polymer-based flexible wireless sensors for real-time health monitoring. The review integrates materials science, device engineering, wireless communication, and clinical applications, offering a framework for next-generation wearable and implantable sensors.
Led by researchers from Northwestern Polytechnical University and Xi’an Jiaotong University, the study addresses the growing need for continuous physiological monitoring beyond traditional hospital-based, episodic measurements. It focuses on sensors designed for epidermal, subcutaneous, and short-term implantable use, emphasizing the interplay between materials, interfaces, and wireless transmission.
The review systematically analyzes different sensing mechanisms, including optical, piezoresistive, capacitive, piezoelectric, triboelectric, chemical, magnetic, and multimodal approaches. It also evaluates wireless communication strategies such as near-field coupling (NFC), far-field protocols (BLE, Wi-Fi, UWB), and acoustic/ultrasonic links, highlighting their respective advantages and limitations in biological environments.
Power supply remains a central challenge. The authors discuss battery-free solutions, including near-field power transfer and radio-frequency energy harvesting, as well as self-powered systems based on triboelectric, piezoelectric, and thermoelectric effects. They also explore intelligent data processing at the edge, including machine learning approaches for real-time signal interpretation.
Material platforms such as carbon-based fillers, metallic nanostructures, functional polymers, hydrogels, and MXenes are compared in terms of conductivity, mechanical compliance, and long-term stability. Various fabrication methods, including 3D/4D printing, photolithography, screen printing, inkjet printing, and electrospinning, are assessed for scalability and performance.
The review identifies key challenges, including material-level noise, wireless link stability under body loading, long-term wearability, and the need for regulatory pathways toward clinical translation. It outlines future directions such as multi-source energy harvesting, body-adaptive antennas, lightweight neural networks, and AI-driven co-design of materials and devices.
The authors conclude that polymer-based flexible wireless sensors have the potential to enable continuous, human-integrated health monitoring, shifting from sporadic clinical measurements to real-time, personalized observation.
Journal
Nano-Micro Letters
DOI
