Publication date: 15th December 2025
Advanced Metal-Oxide and Molybdenum-Based Nanostructures for Wearable Breath Monitoring and Selective Gas Sensing
The development of highly responsive, low-power, and real-time sensors is essential for both environmental safety and non-invasive healthcare diagnostics. In this cumulative work, SnO2-decorated WO3 composites were first engineered to extend sensing capabilities toward breath-based monitoring. These wearable humidity sensors exhibit ultrafast 0.6 s response/recovery, high sensitivity, and excellent mechanical stability, enabling reliable wireless tracking of breathing patterns, including apnea and hypopnea events. Their performance demonstrates strong potential for continuous respiratory-health applications.
Building on this direction, a comprehensive series of molybdenum-based nanostructures was developed to address selective gas detection challenges under ambient and humid conditions. Phase-controlled MoO3 structures (α-MoO3 and prismatic h-MoO3) were synthesized for enhanced ammonia detection, with h-MoO3 delivering superior sensitivity due to its abundant edge-reactive sites. Multiphase MoS₂ containing coexisting 1T and 2H phases enabled room-temperature detection of nonpolar biomarkers such as n-dodecane, supported by DFT insights confirming stronger adsorption on metallic domains. Furthermore, MoS2–MoO2 achieved dual-selective sensing of NH3 and NOₓ even under high humidity, addressing critical requirements for breath and environmental monitoring.
Together, Mo-based sensing systems establish a unified materials framework for next-generation wearable breath sensors and selective environmental gas detection.
Z.S. was supported by ERC-CZ program (project LL2101) from Ministry of Education Youth and Sports (MEYS) and by the project Advanced Functional Nanorobots (reg. No. CZ.02.1.01/0.0/0.0/15_003/0000444 financed by the EFRR).
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