Yang Zhi, Yang Lu, Liu Yucun, Chen Lei
College of Chemistry, Jilin Normal University, Siping 136000, China.
School of Materials Science and Engineering, Jilin Jianzhu University, Changchun 130118, China.
Molecules. 2024 May 18;29(10):2383. doi: 10.3390/molecules29102383.
Surface-enhanced Raman scattering (SERS) is a promising technique for sensitive detection. The design and optimization of plasma-enhanced structures for SERS applications is an interesting challenge. In this study, we found that the SERS activity of MXene (TiCT) can be improved by adding Au nanoparticles (NPs) in a simple photoreduction process. Fluoride-salt-etched MXene was deposited by drop-casting on a glass slide, and Au NPs were formed by the photocatalytic growth of gold(III) chloride trihydrate solutions under ultraviolet (UV) irradiation. The Au-MXene substrate formed by Au NPs anchored on the TiCT sheet produced significant SERS through the synergistic effect of chemical and electromagnetic mechanisms. The structure and size of the Au-decorated MXene depended on the reaction time. When the MXene films were irradiated with a large number of UV photons, the size of the Au NPs increased. Hot spots were formed in the nanoscale gaps between the Au NPs, and the abundant surface functional groups of the MXene effectively adsorbed and interacted with the probe molecules. Simultaneously, as a SERS substrate, the proposed Au-MXene composite exhibited a wider linear range of 10-10 mol/L for detecting carbendazim. In addition, the enhancement factor of the optimized SERS substrate Au-MXene was 1.39 × 10, and its relative standard deviation was less than 13%. This study provides a new concept for extending experimental strategies to further improve the performance of SERS.
表面增强拉曼散射（SERS）是一种用于灵敏检测的很有前景的技术。用于SERS应用的等离子体增强结构的设计与优化是一项有趣的挑战。在本研究中，我们发现通过在一个简单的光还原过程中添加金纳米颗粒（NPs），可以提高MXene（TiCT）的SERS活性。通过滴铸法将氟化物盐蚀刻的MXene沉积在载玻片上，并通过在紫外（UV）照射下三氯化金三水合物溶液的光催化生长形成金纳米颗粒。锚定在TiCT片上的金纳米颗粒形成的金-MXene基底通过化学和电磁机制的协同作用产生了显著的SERS。金修饰的MXene的结构和尺寸取决于反应时间。当用大量紫外光子照射MXene薄膜时，金纳米颗粒的尺寸增大。在金纳米颗粒之间的纳米级间隙中形成了热点，并且MXene丰富的表面官能团有效地吸附探针分子并与之相互作用。同时，作为一种SERS基底，所提出的金-MXene复合材料在检测多菌灵时表现出10⁻¹⁰ mol/L的更宽线性范围。此外，优化后的SERS基底金-MXene的增强因子为1.39×10，其相对标准偏差小于13%。本研究为扩展实验策略以进一步提高SERS性能提供了一个新的概念。
