Fan Xingce, Zhao Xing, Tang Xiao, Li Guoqun, Wei Yunjia, Chen Dexiang, Kong Fan, Lan Leilei, Wang Jiawei, Hao Qi, Qiu Teng
Opt Lett. 2024 Dec 15;49(24):7106-7109. doi: 10.1364/OL.543066.
This work reports a hierarchically structured micromotor (HSM) surface-enhanced Raman scattering (SERS) platform comprising 3D tubular configurations with nanostructured outer walls. The HSMs can be powered by an external magnetic field in solution to enrich molecules with promoted adsorption efficiency. The nanostructured outer wall serves as containers to collect molecules and produce strong localized surface plasmon resonance to intensify Raman of the enriched molecules. Further coupling of HSMs after molecular enrichment can produce additional plasmonic hotspots at the sites where the molecules were enriched, providing a solution to manipulate molecules to enter the plasmonic hotspot region. Moreover, functionalizing specific molecules on the outer wall of HSMs enables high-specificity SERS sensing for benzaldehyde (BA) and Cu ions in liquid. This SERS platform demonstrates great potential for practical applications in biochemical analysis and environmental monitoring, offering a rapid and sensitive tool for detecting low-concentration analytes in liquid.
这项工作报道了一种具有分层结构的微电机（HSM）表面增强拉曼散射（SERS）平台，该平台由具有纳米结构外壁的三维管状结构组成。HSM可以在溶液中由外部磁场驱动，以提高吸附效率来富集分子。纳米结构的外壁充当容器来收集分子，并产生强烈的局域表面等离子体共振，以增强富集分子的拉曼信号。分子富集后HSM的进一步耦合可以在分子富集的部位产生额外的等离子体热点，为操纵分子进入等离子体热点区域提供了解决方案。此外，在HSM的外壁上功能化特定分子能够对液体中的苯甲醛（BA）和铜离子进行高特异性SERS传感。该SERS平台在生化分析和环境监测的实际应用中显示出巨大潜力，为检测液体中的低浓度分析物提供了一种快速且灵敏的工具。
