Localized Surface Plasmon Resonance Decorated with Carbon Quantum Dots and Triangular Ag Nanoparticles for Chlorophyll Detection

This paper demonstrates carbon quantum dots (CQDs) with triangular silver nanoparticles (AgNPs) as the sensing materials of localized surface plasmon resonance (LSPR) sensors for chlorophyll detection. The CQDs and AgNPs were prepared by a one-step hydrothermal process and a direct chemical reductio...

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Bibliographic Details
Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2021-12, Vol.12 (1), p.35
Main Authors: Nazri, Nur Afifah Ahmad, Azeman, Nur Hidayah, Bakar, Mohd Hafiz Abu, Mobarak, Nadhratun Naiim, Luo, Yunhan, Arsad, Norhana, Aziz, Tg Hasnan Tg Abd, Zain, Ahmad Rifqi Md, Bakar, Ahmad Ashrif A
Format: Article
Language:English
Subjects:
Algae
Aminopropyltriethoxysilane
Biomass
Carbon
carbon quantum dots
Chemical reduction
Chlorophyll
Coupling agents
Ethanol
Eutrophication
Functional groups
Glass substrates
Linearity
localized surface plasmon resonance
Microscopy
Morphology
Nanoparticles
optical sensor
Optics
Quantum dots
Resonance
Sensitivity
Sensors
Silver
silver nanoparticles
Spectrum analysis
Surface plasmon resonance
X ray photoelectron spectroscopy
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Summary:This paper demonstrates carbon quantum dots (CQDs) with triangular silver nanoparticles (AgNPs) as the sensing materials of localized surface plasmon resonance (LSPR) sensors for chlorophyll detection. The CQDs and AgNPs were prepared by a one-step hydrothermal process and a direct chemical reduction process, respectively. FTIR analysis shows that a CQD consists of NH , OH, and COOH functional groups. The appearance of C=O and NH at 399.5 eV and 529.6 eV in XPS analysis indicates that functional groups are available for adsorption sites for chlorophyll interaction. A AgNP-CQD composite was coated on the glass slide surface using (3-aminopropyl) triethoxysilane (APTES) as a coupling agent and acted as the active sensing layer for chlorophyll detection. In LSPR sensing, the linear response detection for AgNP-CQD demonstrates R = 0.9581 and a sensitivity of 0.80 nm ppm , with a detection limit of 4.71 ppm ranging from 0.2 to 10.0 ppm. Meanwhile, a AgNP shows a linear response of R = 0.1541 and a sensitivity of 0.25 nm ppm , with the detection limit of 52.76 ppm upon exposure to chlorophyll. Based on these results, the AgNP-CQD composite shows a better linearity response and a higher sensitivity than bare AgNPs when exposed to chlorophyll, highlighting the potential of AgNP-CQD as a sensing material in this study.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano12010035