Abu Bakar Mohd Hafiz, Azeman Nur Hidayah, Mobarak Nadhratun Naiim, Ahmad Nazri Nur Afifah, Tengku Abdul Aziz Tengku Hasnan, Md Zain Ahmad Rifqi, Arsad Norhana, Bakar Ahmad Ashrif A
Photonics Technology Laboratory, Department of Electrical, Electronic and Systems Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia.
Department of Chemical Sciences, Faculty of Science and Technology, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor, Malaysia.
Polymers (Basel). 2022 Jan 14;14(2):329. doi: 10.3390/polym14020329.
This research investigates the physicochemical properties of biopolymer succinyl-κ-carrageenan as a potential sensing material for NH 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 NH. Interaction mechanism studies show the adsorption of NH on κ-carrageenan and succinyl-κ-carrageenan were through multilayer and chemisorption process that follows Freundlich and pseudo-second-order kinetic model.
本研究调查了生物聚合物琥珀酰 - κ - 角叉菜胶作为用于NH局域表面等离子体共振（LSPR）传感器的潜在传感材料的物理化学性质。琥珀酰 - κ - 角叉菜胶是通过κ - 角叉菜胶与琥珀酸酐反应合成的。场发射扫描电子显微镜（FESEM）分析表明，与原始形式相比，琥珀酰 - κ - 角叉菜胶具有均匀且无特征的拓扑结构。琥珀酰 - κ - 角叉菜胶与银纳米颗粒（AgNP）复合作为LSPR传感材料。原子力显微镜（AFM）分析表明，AgNP - 琥珀酰 - κ - 角叉菜胶比AgNP - κ - 角叉菜胶更粗糙，这表明与原始κ - 角叉菜胶相比，来自氧的电负性原子密度增加。AgNP - 琥珀酰 - κ - 角叉菜胶LSPR的灵敏度高于AgNP - κ - 角叉菜胶LSPR。报道的AgNP - 琥珀酰 - κ - 角叉菜胶LSPR的检测限（LOD）和定量限（LOQ）分别为0.5964和2.7192 ppm。因此，AgNP - 琥珀酰 - κ - 角叉菜胶LSPR比AgNP - κ - 角叉菜胶LSPR具有更高的性能，检测范围比传统方法更宽，并且对NH具有高选择性。相互作用机理研究表明，NH在κ - 角叉菜胶和琥珀酰 - κ - 角叉菜胶上的吸附是通过遵循弗伦德利希和准二级动力学模型的多层和化学吸附过程进行的。
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