A Combined Spectroscopic and Theoretical Analysis of Plasmonic Silver Nanoparticle Sensor Towards Detailed Microscopic Understanding of Heavy Metal Detection,Plasmonics

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A Combined Spectroscopic and Theoretical Analysis of Plasmonic Silver Nanoparticle Sensor Towards Detailed Microscopic Understanding of Heavy Metal Detection
Plasmonics ( IF 3.3 ) Pub Date : 2021-08-06 , DOI: 10.1007/s11468-021-01514-6
Nivedita Pan ₁ , Tuhin Kumar Maji ₁ , Arka Chatterjee ₁ , Samir Kumar Pal ₁ , Sayantika Bandyopadhyay ₂ , Pritam Biswas ₃ , Mala Mitra ₃ , Arpita Chatterjee ₃

Affiliation

Plasmonic nanoparticles are of great importance owing to their highly responsive ‘localized surface plasmon resonance’ (LSPR) behaviour to self-agglomeration/aggregation leading to the development of various nanosensors. Herein, we demonstrated the definite self-assembly of citrate functionalized silver nanoparticles (AgNPs) into a one-dimensional linear chain in presence of charged lead ions (Pb²⁺), one of the most toxic heavy metal pollutants. We have explored detail mechanism using a variety of spectroscopic tools and electron microscopy. The self-aggregation of AgNPs leads to the generation of new LSPR modes due to coupling of nearby existing modes. The conclusion of our experimental findings is duly supported by our developed numerical modelling based on the quasi-static approximation that the generated new LSPR modes are solely due to formation of chain-like aggregation of AgNPs. We have also monitored the LSPR spectra in the presence of other metal ions; however, only Pb²⁺ found to give such unique self-assembled geometry may due to its high interaction affinity with citrate. These findings play a key role for citrate functionalised AgNPs to be used as a low cost highly selective and sensitive lead ion sensor for potential application in industrial lead pollution monitoring. We have further varied several sensor parameters such as AgNPs size, concentration, and the allowed reaction time for it to be practically implemented as an efficient lead sensor meeting the Environmental Protection Agency recommendations.

Graphical abstract

The possible sensing mechanism of citrate-functionalized silver nanoparticles towards Pb2 + followed by unique chain-like aggregation for potential atmospheric and industrial lead pollution monitoring.

中文翻译：

等离子银纳米粒子传感器的光谱和理论分析相结合，对重金属检测进行详细的微观理解

等离子体纳米粒子非常重要，因为它们对自聚集/聚集具有高度响应的“局部表面等离子体共振”（LSPR）行为，从而导致了各种纳米传感器的发展。在此，我们证明了在带电铅离子（Pb ²⁺)，毒性最强的重金属污染物之一。我们使用各种光谱工具和电子显微镜探索了细节机制。由于附近现有模式的耦合，AgNPs 的自聚集导致产生新的 LSPR 模式。我们的实验结果的结论得到了我们基于准静态近似的开发的数值模型的充分支持，即生成的新 LSPR 模式完全是由于 AgNPs 的链状聚集的形成。我们还监测了其他金属离子存在下的 LSPR 光谱；然而，只有 Pb ²⁺发现提供这种独特的自组装几何形状可能是由于其与柠檬酸盐的高相互作用亲和力。这些发现对于将柠檬酸盐功能化的 AgNPs 用作低成本、高选择性和灵敏的铅离子传感器在工业铅污染监测中的潜在应用发挥了关键作用。我们进一步改变了几个传感器参数，例如 AgNPs 的大小、浓度和允许的反应时间，使其实际实施为符合环境保护署建议的高效铅传感器。