Chlorophyll Detection by Localized Surface Plasmon Resonance Using Functionalized Carbon Quantum Dots Triangle Ag...

Area of Science:

• Nanotechnology
• Analytical Chemistry
• Environmental Science

Background:

• Chlorophyll detection is crucial for monitoring ocean health and photosynthetic activity.
• Existing methods for chlorophyll detection may lack sensitivity or selectivity.
• Localized Surface Plasmon Resonance (LSPR) offers a promising platform for optical sensing applications.

Purpose of the Study:

• To develop a sensitive and selective optical sensor for chlorophyll detection.
• To integrate amino-functionalized carbon quantum dots (NCQD) with silver nanoparticles (AgNPs) for enhanced sensing capabilities.
• To evaluate the performance of the developed sensor for chlorophyll detection in oceanic environments.

Main Methods:

• Fabrication of an AgNPs-NCQD composite film on a silanized glass slide using self-assembly.
• Utilizing LSPR principles for optical detection of chlorophyll.
• Characterization of sensor performance, including sensitivity, detection limit, and selectivity.

Main Results:

• The AgNPs-NCQD film exhibited superior performance compared to AgNPs and AgNPs-CQD films, with a correlation coefficient (R²) of 0.9835.
• The sensor demonstrated a high sensitivity of 2.23 nm ppm⁻¹ for chlorophyll detection.
• Low detection (1.03 ppm) and quantification (3.40 ppm) limits were achieved in the range of 0.05 to 6 ppm.
• No significant interference was observed from common ionic species (NO₂⁻, PO₄³⁻, NH₄⁺, Fe³⁺).

Conclusions:

• The developed AgNPs-NCQD composite-based LSPR sensor provides a highly sensitive and selective method for chlorophyll detection.
• The sensor exhibits excellent stability and minimal interference, suitable for real-world applications.
• This technology holds potential for effective chlorophyll monitoring in marine ecosystems.