Sharma Surbhi, Sharma Keshav, Majhi Shukla, Shekhar Pati Tripathi Chandra, Guin Debanjan
Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India.
Department of Physics, Institute of Science, Banaras Hindu University, Varanasi 221005, India.
Spectrochim Acta A Mol Biomol Spectrosc. 2024 Dec 15;323:124885. doi: 10.1016/j.saa.2024.124885. Epub 2024 Jul 31.
Surface-enhanced Raman spectroscopy (SERS) is a highly precise and non-invasive analytical method known for its ability to detect vibrational signatures of minute analytes with exceptional sensitivity. However, the efficacy of SERS is subject to substrate properties, and current methodologies face challenges in attaining consistent, replicable, and stable substrates to regulate plasma hot spots across a wide spectral range. This study introduces a straightforward and economical approach that incorporates monodispersed silver nanoparticles onto 2-D porous magnesium oxide nanosheets (Ag@MgO-NSs) through an in-situ process. The resulting nanocomposite, Ag@MgO-NSs, demonstrates substantial SERS enhancement owing to its distinctive plasmonic resonance. The effectiveness of this nanocomposite is exemplified by depositing diverse environmental pollutants as analytes, such as antibiotic ciprofloxacin (CIP), organic dyes like rhodamine 6G (R6G) and methylene blue (MB), and nitrogen-rich pollutant like melamine (MLN), onto the proposed substrate. The proposed nanocomposite features a 2-D porous structure, resulting in a larger surface area and consequently providing numerous adsorption sites for analytes. Moreover, engineering the active sites of the nanocomposite results in a higher number of hotspots, leading to an enhanced performance. The nanocomposite outperforms, exhibiting superior detection capabilities for R6G, MB, and MLN at concentrations of 10 M and CIP at concentration of 10 M, with impressive uniformity, reproducibility, stability, and analytical enhancement factors (EF) of 6.3 x 10, 2 x 10, 2.73 x 10 and 1.8 x 10 respectively. This approach provides a direct and cost-effective method for the detection of a broad spectrum of environmental pollutants and food additives, presenting potential applications across diverse domains. The detected environmental pollutants and food additives are removed through both catalytic degradation (R6G and MB) and adsorption (CIP and MLN).
表面增强拉曼光谱（SERS）是一种高度精确且非侵入性的分析方法，以其能够以卓越的灵敏度检测微量分析物的振动特征而闻名。然而，SERS的功效取决于基底特性，当前的方法在获得一致、可重复和稳定的基底以在宽光谱范围内调节等离子体热点方面面临挑战。本研究介绍了一种简单且经济的方法，通过原位过程将单分散银纳米颗粒结合到二维多孔氧化镁纳米片（Ag@MgO-NSs）上。所得的纳米复合材料Ag@MgO-NSs由于其独特的等离子体共振而表现出显著的SERS增强。通过将多种环境污染物作为分析物沉积在提出的基底上，例如抗生素环丙沙星（CIP）、罗丹明6G（R6G）和亚甲基蓝（MB）等有机染料以及三聚氰胺（MLN）等富氮污染物，例证了这种纳米复合材料的有效性。所提出的纳米复合材料具有二维多孔结构，导致更大的表面积，从而为分析物提供了大量的吸附位点。此外，对纳米复合材料的活性位点进行工程设计会产生更多的热点，从而提高性能。该纳米复合材料表现优异，在10 M浓度下对R6G、MB和MLN以及在10 M浓度下对CIP具有卓越的检测能力，具有令人印象深刻的均匀性、可重复性、稳定性，分析增强因子（EF）分别为6.3×10、2×10、2.73×10和1.8×10。这种方法为检测广泛的环境污染物和食品添加剂提供了一种直接且经济高效的方法，在不同领域呈现出潜在的应用。检测到的环境污染物和食品添加剂通过催化降解（R6G和MB）和吸附（CIP和MLN）两种方式被去除。
