Magneto-plasmonic bionanocomposites for on-site SERS detection of water contaminants†

IF 3.5 Q2 CHEMISTRY, ANALYTICAL
Sofia F. Soares, Nuno M. A. S. Silva, João Brenheiro, Sara Fateixa, Ana L. Daniel-da-Silva and Tito Trindade
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Abstract

Magneto-plasmonic nanosystems have emerged as important multifunctional structures for several sensing applications, including on-site water quality monitoring. In this scenario, these nanosystems can integrate magnetic assisted separation procedures associated with optical detection of water contaminants, by exploring the surface-enhanced Raman scattering effect (SERS). Among the several modalities proposed for such magneto-plasmonic nanosystems, bionanocomposite particles have not been explored in this context. Hence, this research introduces bionanocomposites comprising magnetite cores that have been coupled to Au nanoparticles (NPs) via an intermediate surface modification step using hybrid shells of trimethyl chitosan-SiO2. The magnetic bionanocomposites were decorated with Au NPs by exploring two methods: their assembly with pre-synthesized Au colloids and as heterogeneous substrates for the in situ synthesis of Au NPs. The resulting magneto-plasmonic nanosystems are responsive to an external magnetic gradient and show the localized surface plasmon resonance (LSPR) band ascribed to the Au NPs. Therefore, such multifunctionality was explored here by assessing the SERS performance of the magneto-plasmonic substrates after their use as magnetic nanosorbents for the uptake of organic dyes, specifically methylene blue (MB) and rose bengal (RB), as water contaminant models. The results showed that both types of substrates are effective, though the ex situ bionanocomposites have shown better SERS activity. As such, the latter have been selected to further demonstrate the versatility of the bionanocomposites for the SERS detection of other types of water contaminants, such as salicylic acid (SA), a pharmaceutical compound that is classified as a teratogen substance. Overall, these findings indicate that magneto-plasmonic bionanocomposites, indeed can be explored as more sustainable platforms for analytical purposes, combining the ability for magnetic separation and SERS trace detection.

Abstract Image

用于现场 SERS 检测水污染物的磁-质子仿生复合材料
磁性-等离子体纳米系统已成为多种传感应用(包括现场水质监测)的重要多功能结构。在这种情况下,这些纳米系统可以通过探索表面增强拉曼散射效应(SERS),整合与水污染物光学检测相关的磁辅助分离程序。在为此类磁-质子纳米系统提出的几种模式中,仿生复合粒子尚未在此背景下得到探索。因此,本研究引入了由磁铁矿核组成的仿生纳米复合材料,这些磁铁矿核通过使用三甲基壳聚糖-二氧化硅混合壳的中间表面改性步骤与金纳米粒子(NPs)耦合。磁性仿生复合材料通过两种方法进行金纳米粒子装饰:与预合成的金胶体组装,以及作为原位合成金纳米粒子的异质基底。由此产生的磁等离子纳米系统对外部磁梯度具有响应性,并显示出归因于金负电荷的局部表面等离子体共振(LSPR)波段。因此,本文通过评估磁性等离子基底作为磁性纳米吸附剂吸附有机染料(特别是作为水污染模型的亚甲基蓝(MB)和玫瑰红(RB))后的 SERS 性能,探索了这种多功能性。结果表明,这两种基质都很有效,但原位仿生复合材料显示出更好的 SERS 活性。因此,我们选择了后者来进一步证明仿生复合材料在 SERS 检测其他类型水污染物方面的多功能性,如水杨酸(SA),一种被归类为致畸物质的药物化合物。总之,这些研究结果表明,磁-质子仿生复合材料确实可以作为更可持续的分析平台,将磁分离和 SERS 痕量检测能力结合起来。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
2.30
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