Abstract

Plasmonic nanoparticles having localized surface plasmon resonance in the visible and infrared region are potential candidates for the fabrication of simple, rapid, selective and specific metal ion detection systems based on colorimetry and surface-enhanced Raman spectroscopy. The study describes simple approaches for selective colorimetric and surface-enhanced Raman scattering determination of aluminum(III), chromium (VI), chromiun(III), manganese (II), iron(II) and arsenic (V) ions in aqueous medium using ferulic acid functionalized silver nanoparticles (F-AgNPs) synthesized by chemical reduction and microwave assisted method. The analysis of photographs reveals that ferulic acid functionalized silver nanoparticles synthesized by chemical reduction (C-F-AgNPs) sensitively detect Al(III) ions in aqueous media while nanoparticles synthesized by microwave reduction method can be used to determine As(V), Mn(II) and Fe(II) ions. In addition, C-F-AgNPs also enhance the Raman spectral profile of the water samples spiked by Cr(III) ions giving a peculiar vibration spectral feature that assists in the detection of Cr(III) ion in aqueous medium. Moreover, ferulic acid functionalized silver nanoparticles synthesized by the microwave assisted method (M-F-AgNPs) increase the intensity of Raman bands in the spectral profile of the water samples spiked with Cr(VI) and Mn(II) ions. The specific and selective interactions of F-AgNPs with the Cr(VI), Cr(III), Mn(II), Fe(II), Al(III) and As(V) leading to the aggregation of the dispersed silver nanoparticles enable their determination in aqueous media . The results of the present study shows the potential of F-AgNPs based sensor probes toward conceptualizing and fabricating simple, rapid and cost effective detection tools onsite determination of metal ions in aqueous media.

摘要

在可见光和红外区域具有局部表面等离子共振的等离子纳米粒子是制造基于比色法和表面增强拉曼光谱的简单、快速、选择性和特异性金属离子检测系统的潜在候选者。该研究描述了选择性比色和表面增强拉曼散射测定水介质中铝 (III)、铬 (VI)、铬 (III)、锰 (II)、铁 (II) 和砷 (V) 离子的简单方法通过化学还原和微波辅助方法合成的阿魏酸功能化银纳米粒子（F-AgNPs）。照片分析表明，化学还原法合成的阿魏酸功能化银纳米粒子（CF-AgNPs）可灵敏地检测水介质中的 Al(III) 离子，而微波还原法合成的纳米粒子可用于测定 As(V)、Mn(II) ) 和 Fe(II) 离子。此外，CF-AgNPs 还增强了掺有 Cr(III) 离子的水样的拉曼光谱曲线，从而提供了一种特殊的振动光谱特征，有助于检测水介质中的 Cr(III) 离子。此外，通过微波辅助方法 (MF-AgNPs) 合成的阿魏酸功能化银纳米颗粒增加了掺有 Cr(VI) 和 Mn(II) 离子的水样光谱中拉曼谱带的强度。F-AgNPs 与 Cr(VI)、Cr(III)、Mn(II)、Fe(II) 的特异性和选择性相互作用，导致分散的银纳米粒子聚集的 Al(III) 和 As(V) 使其能够在水性介质中进行测定。本研究的结果显示了基于 F-AgNPs 的传感器探针在概念化和制造简单、快速且具有成本效益的检测工具现场测定水介质中的金属离子方面的潜力。