Fabrication of SnO2-WO3 composite material for ultrafast wearable motion sensors
Source abstract
Abstract
This study presents a systematic investigation of SnO2-WO3 composite materials synthesized via a controlled hydrothermal approach for advanced motion sensing applications. Through precise control of SnO2 precursor concentration (0.1-1.0 mM), we achieved tunable morphological evolution from discrete nanoparticle decoration to complete shell encapsulation on WO3 nanosheets. The composites exhibited enhanced porosity characteristics with increased total pore volume from 0.031 to 0.246 cm3 /g and enlarged average pore size from 21.4 to 28.4 nm. XPS analysis confirmed the successful formation of heterojunctions between Sn4+ and W6+ species, leading to optimized electron transport pathways. The resulting sensors demonstrated exceptional strain sensitivity with gauge factors reaching 2140, ultrafast temporal response (8 ms response/12 ms recovery), and remarkable stability over 10,000 deformation cycles. The devices successfully detected a broad spectrum of human motions, from substantial movements (156% resistance change for finger bending) to subtle physiological signals (0.8% for pulse monitoring), while maintaining performance stability under various environmental conditions. This work establishes a robust framework for developing high-performance flexible sensing materials through strategic heterostructure engineering.
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Research context
OpenAlex topics: Advanced Sensor and Energy Harvesting Materials · Gas Sensing Nanomaterials and Sensors · Non-Invasive Vital Sign Monitoring
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