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

• 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
• ISSN: 2079-4991; 2079-4991
• DOI: 10.3390/nano12010035

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.