Data from: Active control of silver nanoparticles spacing using dielectrophoresis for surface-enhanced Raman scattering

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We demonstrate an active microfluidic platform that integrates dielectrophoresis for the control of silver nanoparticles spacing, as they flow in a liquid channel. By careful control of the nanoparticles spacing, we can effectively increase the surface-enhanced Raman scattering (SERS) signal intensity based on augmenting the number of SERS-active hot-spots, while avoiding irreversible aggregation of the particles. The system is benchmarked using dipicolinate (2,6-pyridinedicarboxylic acid) (DPA), which is a biomarker of Bacillus anthracis. The validity of the results is discussed using several complementing characterization scenarios.

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本研究展示了一款集成介电泳（dielectrophoresis）技术的主动式微流控平台，可在流体通道内调控流动中的银纳米颗粒间距。
通过精准调控纳米颗粒间距，我们可通过增加SERS活性热点的数量，有效提升表面增强拉曼散射（surface-enhanced Raman scattering，SERS）信号强度，同时避免纳米颗粒发生不可逆团聚。
本系统采用吡啶二羧酸（2,6-pyridinedicarboxylic acid，DPA）作为测试基准，该物质是炭疽芽孢杆菌（Bacillus anthracis）的生物标志物。
本研究通过多种互补表征实验方案，对实验结果的有效性展开了讨论。