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

Nur Afifah Ahmad Nazri¹, Nur Hidayah Azeman¹, Mohd Hafiz Abu Bakar¹

¹Department of Electrical, Electronic and Systems Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia.

Nanomaterials (Basel, Switzerland)

|September 9, 2022

Summary

A novel optical sensor using amino-functionalized carbon quantum dots and silver nanoparticles offers sensitive and selective chlorophyll detection. This localized surface plasmon resonance (LSPR) sensor shows high sensitivity and minimal interference, making it suitable for ocean monitoring.

Keywords:

carbon quantum dots chlorophyll optical sensor silver nanoparticles surface plasmon resonance

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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.