Department of Chemical Engineering, Indian Institute of Technology, Delhi, 110016, India.
Department of Chemical Engineering, Indian Institute of Technology, Delhi, 110016, India.
Talanta. 2022 Jan 1;236:122819. doi: 10.1016/j.talanta.2021.122819. Epub 2021 Aug 26.
Surface-enhanced Raman scattering (SERS) based on plasmonic metal nanoparticles and semiconductors has been used as performance-enhancing structures for sensing trace chemicals. We have selected a case of oxide functional oxide organic nanostructure between ZnFeO and ZnO, denoted as ZZF. By decorating such nanostructure with AuNPs, to identify R6G in varying concentrations (10 M - 10 M), an enhancement factor of 1.6 × 10 was observed. The material was used for the identification of melamine in the concentration range of 0.39 μM-7.92 μM. This high-performance nanocomposite provides improved melamine sensitivity towards SERS and the limit of detection as low as 0.39 μM. The Au-ZZF SERS substrate can yield a SERS enhancement factor of 1.37 × 10. The experimental performance demonstrates that excellent SERS enhancement is due to electrons movement within ZZF and Au nanoparticles. Owing to its easy and effective synthesis methodology, this sensitive and specific SERS substrate is a promising technique to detect trace chemicals. We further study the best energetically favorable orientation of melamine molecules over the substrate leading to the SERS activity using density functional theoretical study.
基于等离子体金属纳米粒子和半导体的表面增强拉曼散射（SERS）已被用作增强痕量化学物质传感性能的增强结构。我们选择了 ZnFeO 和 ZnO 之间的氧化物功能氧化物有机纳米结构作为案例，记为 ZZF。通过用 AuNPs 修饰这种纳米结构，可以识别不同浓度（10 -M 至 10 -M）的 R6G，观察到增强因子为 1.6×10。该材料用于在 0.39 μM-7.92 μM 的浓度范围内识别三聚氰胺。这种高性能纳米复合材料提高了 SERS 对三聚氰胺的灵敏度，检测限低至 0.39 μM。Au-ZZF SERS 基底的 SERS 增强因子高达 1.37×10。实验性能表明，优异的 SERS 增强是由于 ZZF 和 Au 纳米粒子内的电子运动。由于其简单有效的合成方法，这种灵敏且特异的 SERS 基底是一种有前途的痕量化学物质检测技术。我们进一步使用密度泛函理论研究研究了三聚氰胺分子在底物上的最佳能量有利取向，从而导致 SERS 活性。
