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Ultrasensitive sulphide detecting by using Au (core)-Ag (shell) triangular nanoprisms.

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    Researchers developed a new method for detecting hydrogen sulfide (H2S) using gold-silver nanoprisms. This ultrasensitive technique achieves a record low detection limit, advancing biochemical sensing capabilities.

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    Area of Science:

    • Biochemistry
    • Nanotechnology
    • Chemical Sensing

    Background:

    • Hydrogen sulfide (H2S) is a critical endogenous gaseous signaling molecule involved in numerous biological and metabolic processes.
    • Highly sensitive detection of H2S is crucial for understanding its biological roles and is a key challenge in biochemical sensing.
    • Existing methods for sulfide detection lack the required sensitivity for comprehensive functional elucidation.

    Purpose of the Study:

    • To develop an ultrasensitive method for detecting sulfide using novel plasmonic nanoprobes.
    • To establish a new benchmark for sulfide detection limits in biochemical and environmental analysis.
    • To demonstrate the efficacy of gold-silver triangular nanoprisms (Au@Ag TNPs) for enhanced sulfide sensing.

    Main Methods:

    • Synthesis of gold (core)-silver (shell) triangular nanoprisms (Au@Ag TNPs).
    • Utilizing the preferential formation of silver sulfide (Ag2S) at the sharp corners of Au@Ag TNPs.
    • Analyzing spectral shifts in nanoprobes and single-particle scattering spectra for detection.

    Main Results:

    • Achieved a three-orders-of-magnitude enhancement in detection limit compared to gold-silver nanorods.
    • Successfully reduced the detection limit for sulfide to 1 femtomolar (fM) using individual Au@Ag TNPs.
    • Demonstrated the lowest reported detection limit for sulfide to date.

    Conclusions:

    • Au@Ag TNPs provide a highly effective plasmonic nanoprobe for ultrasensitive sulfide detection.
    • This method significantly advances the capabilities of biochemical sensing for H2S.
    • The developed technique holds substantial promise for applications in biochemistry and environmental science.