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

Nur Afifah Ahmad Nazri; Nur Hidayah Azeman; Mohd Hafiz Abu Bakar; Nadhratun Naiim Mobarak; Tg Hasnan Tg Abd Aziz; Ahmad Rifqi Md Zain; Norhana Arsad; Yunhan Luo; Ahmad Ashrif A Bakar

doi:10.3390/nano12172999

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

Nanomaterials (Basel). 2022 Aug 30;12(17):2999. doi: 10.3390/nano12172999.

Authors

Nur Afifah Ahmad Nazri¹, Nur Hidayah Azeman¹, Mohd Hafiz Abu Bakar¹, Nadhratun Naiim Mobarak², Tg Hasnan Tg Abd Aziz³, Ahmad Rifqi Md Zain³, Norhana Arsad¹, Yunhan Luo⁴, Ahmad Ashrif A Bakar^{1

5}

Affiliations

¹ Department of Electrical, Electronic and Systems Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia.
² Department of Chemical Sciences, Faculty of Sciences and Technology, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia.
³ Institute of Microengineering and Nanoelectronics, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia.
⁴ Guangdong Provincial Key Laboratory of Optical Fibre Sensing and Communications, College of Science and Engineering, Jinan University, Guangzhou 510632, China.
⁵ Institut Islam Hadhari, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia.

Abstract

An optical sensor-based localized surface plasmon resonance (LSPR) sensor was demonstrated for sensitive and selective chlorophyll detection through the integration of amino-functionalized carbon quantum dots (NCQD) and triangle silver nanoparticles (AgNPs). The additions of amino groups to the CQD enhance the detection of chlorophyll through electrostatic interactions. AgNPs-NCQD composite was fabricated on the surface of the silanized glass slide using the self-assembly technique. The experimental results showed that the AgNPs-NCQD film-based LSPR sensor detects better than AgNPs and AgNPs-CQD films with a good correlation coefficient (R² = 0.9835). AgNPs-NCQD showed a high sensitivity response of 2.23 nm ppm^-1. The detection and quantification limits of AgNPs-NCQD are 1.03 ppm and 3.40 ppm, respectively, in the range of 0.05 to 6 ppm. Throughout this study, no significant interference was observed among the other ionic species (NO₂^-, PO₄^-, NH₄⁺, and Fe³⁺). This study demonstrates the applicability of the proposed sensor (AgNPs-NCQD) as a sensing material for chlorophyll detection in oceans.

Keywords: carbon quantum dots; chlorophyll; optical sensor; silver nanoparticles; surface plasmon resonance.

Abstract

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