Succinyl-κ-carrageenan Silver Nanotriangles Composite for Ammonium Localized Surface Plasmon Resonance Sensor

Polymers

Nadhratun Naiim Mobarak¹  Ahmad Rifqi Md Zain²  Tengku Hasnan Tengku Abdul Aziz²  Norhana Arsad³  Nur Afifah Ahmad Nazri³  Mohd Hafiz Abu Bakar³  Ahmad Ashrif A. Bakar³  Nur Hidayah Azeman³ 

[1] Department of Chemical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia;Institute of Microengineering and Nanoelectronics, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia;Photonics Technology Laboratory, Department of Electrical, Electronic and Systems Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia;

关键词: polysaccharide;    carrageenan;    surface plasmon resonance;    ammonium ion;    adsorbent;    isotherm;   

DOI  :  10.3390/polym14020329

来源: DOAJ

【 摘 要 】

This research investigates the physicochemical properties of biopolymer succinyl-κ-carrageenan as a potential sensing material for NH₄⁺ Localized Surface Plasmon Resonance (LSPR) sensor. Succinyl-κ-carrageenan was synthesised by reacting κ-carrageenan with succinic anhydride. FESEM analysis shows succinyl-κ-carrageenan has an even and featureless topology compared to its pristine form. Succinyl-κ-carrageenan was composited with silver nanoparticles (AgNP) as LSPR sensing material. AFM analysis shows that AgNP-Succinyl-κ-carrageenan was rougher than AgNP-Succinyl-κ-carrageenan, indicating an increase in density of electronegative atom from oxygen compared to pristine κ-carrageenan. The sensitivity of AgNP-Succinyl-κ-carrageenan LSPR is higher than AgNP-κ-carrageenan LSPR. The reported LOD and LOQ of AgNP-Succinyl-κ-carrageenan LSPR are 0.5964 and 2.7192 ppm, respectively. Thus, AgNP-Succinyl-κ-carrageenan LSPR has a higher performance than AgNP-κ-carrageenan LSPR, broader detection range than the conventional method and high selectivity toward NH₄⁺. Interaction mechanism studies show the adsorption of NH₄⁺ on κ-carrageenan and succinyl-κ-carrageenan were through multilayer and chemisorption process that follows Freundlich and pseudo-second-order kinetic model.

【 授权许可】

Unknown