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Sensitivity-enhanced surface plasmon sensor modified with MoSe2 overlayer.

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    This study introduces a new surface plasmon resonance (SPR) sensor enhanced with molybdenum diselenide (MoSe2) overlayers. The optimized MoSe2 modification significantly boosts sensor sensitivity for detecting refractive index changes.

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    Area of Science:

    • Materials Science
    • Nanotechnology
    • Sensor Technology

    Background:

    • Surface Plasmon Resonance (SPR) sensors are crucial for label-free detection.
    • Enhancing SPR sensor sensitivity is vital for improved analytical performance.
    • Molybdenum diselenide (MoSe2) possesses unique properties beneficial for sensor applications.

    Purpose of the Study:

    • To investigate the integration of MoSe2 as a modification overlayer to enhance SPR sensor sensitivity.
    • To determine the optimal MoSe2 deposition for maximum refractive index (RI) sensitivity.
    • To explore the potential of MoSe2-modified SPR sensors in various fields.

    Main Methods:

    • Fabrication of a conventional SPR sensor using the Kretschmann configuration.
    • Physical deposition of MoSe2 onto the SPR sensor surface.
    • Systematic variation of MoSe2 deposition cycles to study its effect on sensor performance.

    Main Results:

    • MoSe2 overlayer significantly improves the RI sensitivity of the SPR sensor.
    • Highest sensitivity of 2524.8 nm/RIU achieved with 2 deposition cycles of MoSe2.
    • A 36.3% sensitivity enhancement was observed compared to the unmodified sensor.

    Conclusions:

    • MoSe2 is an effective material for enhancing SPR sensor sensitivity.
    • The proposed MoSe2-modified SPR sensor offers improved performance with ease of fabrication.
    • This technology holds promise for advanced biological, chemical, and medical sensing applications.