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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Stretchable and upconversion-luminescent polymeric optical sensor for wearable multifunctional sensing.

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    A novel stretchable and multifunctional optical sensor (SMOS) simultaneously measures temperature and strain. This wearable sensor uses upconversion nanoparticles for accurate physiological monitoring during human body motion.

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    Area of Science:

    • Materials Science
    • Biomedical Engineering
    • Nanotechnology

    Background:

    • Wearable sensors are crucial for healthcare and AI, but integrating high stretchability with simultaneous thermal and mechanical sensing remains challenging.
    • Existing wearable electronic sensors struggle to provide simultaneous, reliable readings of both temperature and strain under dynamic conditions.
    • The demand for advanced wearable sensors capable of complex physiological monitoring necessitates innovative material solutions.

    Purpose of the Study:

    • To develop a stretchable and multifunctional optical sensor (SMOS) capable of simultaneous temperature and strain detection.
    • To enable real-time, wearable physiological monitoring of human body temperature and motion activities.
    • To overcome the limitations of current wearable sensors in achieving high stretchability and multi-functional sensing.

    Main Methods:

    • Fabrication of a stretchable optical sensing fiber using polymer nanocomposites embedded with lanthanide-based upconversion nanoparticles (UCNPs).
    • Temperature measurement via ratiometric intensity analysis of dual-emission UCNPs under near-infrared excitation.
    • Strain detection through reversible changes in light transmission upon sensor deformation.

    Main Results:

    • The SMOS achieved simultaneous and independent readout of temperature and strain.
    • Temperature measurements were unaffected by strain-induced deformations, ensuring stable readings during motion.
    • The sensor demonstrated detectable and reversible changes in light transmission corresponding to applied tensile strains.

    Conclusions:

    • A highly stretchable, multifunctional optical sensor (SMOS) was successfully developed for simultaneous temperature and strain sensing.
    • The SMOS offers a promising platform for advanced wearable physiological monitoring, particularly for tracking skin temperature and body motion.
    • This technology addresses a critical need for integrated, high-performance sensing in healthcare and AI applications.