Advancements and Emerging Trends in Flexible Wearable Sensors: A Review

This review paper aims to provide a comprehensive overview of various flexible wearable devices and sensors, including piezoresistive sensors and energy harvesting applications. It discusses recent advancements in materials, structures, and performance factors of flexible wearables. The paper delves into membrane properties, piezoelectric characteristics, and other compositional parameters, making it valuable for beginners in polymer ionic membranes to translate theoretical concepts into practical devices and applications. Additionally, the paper explores different structures of wearable sensors made from various materials for sustainable development. It covers several in-situ techniques and characterization methods that can be used for efficient utilization of wearable sensors, which are highlighted as crucial for technological and environmental advancements, increasing the standard of living, and prolonging Earth's life. The paper also notes that many wearable sensors, with their compact form factor, exhibit distinct potential profiles. Strategies to achieve uniform potential distribution can reduce capacity loss and enhance long-lasting energy storage solutions for wearable devices.