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    A novel electric field method enables ppb-level ammonia detection using carbon-based field-effect transistor (FET) gas sensors. This approach enhances sensitivity and facilitates on-chip integration without auxiliary heating or lighting.

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    Area of Science:

    • Materials Science
    • Chemical Sensors
    • Nanotechnology

    Background:

    • High-sensitivity gas sensors are crucial for environmental monitoring and disease diagnosis.
    • Conventional methods for enhancing gas sensor performance require auxiliary heating/lighting, hindering device integration.
    • Ammonia (NH3) detection is vital for various applications.

    Purpose of the Study:

    • To propose a novel method for adjusting sensing material work function using an electric field for enhanced gas sensing.
    • To develop an on-chip integrated gas sensor for ppb-level ammonia detection.
    • To elucidate the underlying sensing mechanism involving electric field modulation.

    Main Methods:

    • Design and fabrication of a carbon-based dual-gate field-effect transistor (FET) gas sensor.
    • Utilizing an electric field to modulate the work function of the sensing material.
    • Density Functional Theory (DFT) calculations and electronic structure analysis to understand the sensing mechanism.
    • Differential charge density calculations to analyze NH3 adsorption.

    Main Results:

    • Achieved ppb-level ammonia detection limit of 40 ppb at 25 °C with an optimized control gate voltage of -8 V.
    • Demonstrated that the electric field modulates the work function, enhancing sensor performance.
    • Revealed that the electric field regulates NH3 adsorption site, distance, and molecular polarization.

    Conclusions:

    • The electric field is a novel and universal strategy for developing high-performance, on-chip integrable gas sensors.
    • This work provides a mechanism for electric field-enhanced gas sensing, applicable to various sensing materials.
    • The developed FET gas sensor offers a promising solution for sensitive and integrated ammonia detection.