Related Experiment Video
Updated: Oct 7, 2025
03:33
Author Spotlight: Development and Application of SERS Flexible Substrates Using Synthesized AgNPs
Published on: November 17, 2023
2.6K
Localized Surface Plasmon Resonance Decorated with Carbon Quantum Dots and Triangular Ag Nanoparticles for
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, Malaysia.
Nanomaterials (Basel, Switzerland)
|January 11, 2022
Summary
This study developed a novel sensor using carbon quantum dots (CQDs) and silver nanoparticles (AgNPs) for sensitive chlorophyll detection. The AgNP-CQD composite offers enhanced linearity and sensitivity compared to AgNPs alone.
Area of Science:
- Materials Science
- Nanotechnology
- Analytical Chemistry
Background:
- Chlorophyll detection is crucial for assessing plant health and photosynthetic efficiency.
- Localized Surface Plasmon Resonance (LSPR) sensors offer high sensitivity for molecular detection.
- Developing robust and sensitive sensing materials is essential for accurate chlorophyll quantification.
Purpose of the Study:
- To synthesize and characterize a novel sensing material based on carbon quantum dots (CQDs) and triangular silver nanoparticles (AgNPs).
- To investigate the efficacy of the AgNP-CQD composite as an active sensing layer in LSPR sensors for chlorophyll detection.
- To compare the sensing performance of the AgNP-CQD composite with bare AgNPs for chlorophyll detection.
Main Methods:
- Carbon quantum dots (CQDs) were synthesized via a one-step hydrothermal process.
- Triangular silver nanoparticles (AgNPs) were prepared using a direct chemical reduction method.
- AgNP-CQD composites were fabricated and immobilized on glass slides using (3-aminopropyl) triethoxysilane (APTES) as a coupling agent for LSPR sensing.
Main Results:
- FTIR and XPS analyses confirmed the presence of functional groups (NH2, OH, COOH, C=O) on CQDs, indicating adsorption sites for chlorophyll.
- The AgNP-CQD composite LSPR sensor exhibited a linear response (R² = 0.9581) with a sensitivity of 0.80 nm ppm⁻¹ and a detection limit of 4.71 ppm for chlorophyll.
- Bare AgNPs showed significantly lower performance, with a linear response of R² = 0.1541, a sensitivity of 0.25 nm ppm⁻¹, and a detection limit of 52.76 ppm.
Conclusions:
- The AgNP-CQD composite demonstrates superior linearity and sensitivity for chlorophyll detection compared to bare AgNPs.
- The functional groups on CQDs enhance the interaction and adsorption of chlorophyll molecules on the sensor surface.
- The AgNP-CQD composite shows significant potential as an advanced sensing material for chlorophyll detection applications.
Keywords:
carbon quantum dotschlorophylllocalized surface plasmon resonanceoptical sensorsilver nanoparticles
