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首页> 外文期刊>RSC Advances >Nanoporous silver microstructure for single particle surface-enhanced Raman scattering spectroscopy
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Nanoporous silver microstructure for single particle surface-enhanced Raman scattering spectroscopy

机译：用于单粒子表面增强拉曼散射光谱的纳米多孔银微观结构

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摘要

The potential of a nanoporous Ag microstructure (np-AgMs) for use as a single particle for surface-enhanced Raman scattering spectroscopy (SERS), with the added advantages of being easy to manipulate and reusable, was successfully demonstrated. The np-AgMs with interconnected pore and controllable pore size were fabricated from symmetric hexapod AgCl via a galvanic replacement reaction in NaCl solution with zinc (Zn) as the sacrificed metal. The clean surface of np-AgMs enables rapid surface functionalization with easy handling and sample preparation as no particle aggregation occurs. The SERS acquisition spots on the np-AgMs can be visually selected using a normal Raman microscope. SERS spectra of p-aminothiophenol (PATP) with a concentration range of 10 (8)-10 (3) M can be achieved. The position-dependent enhancement of np-AgMs was expendably evaluated. The signal-position correlation was confirmed by electric filed enhancement obtained from Finite-difference time-domain (FDTD) calculation. In addition, the highly stable substrate showed insignificant loss of the enhanced Raman signal after several cycles of chemical re-generation. Finally, the potential application of np-AgMs in label-free detection of biomolecules including hemoprotein, protein without chromophore and DNA strains at low concentration of 500 mu g mL(-1) was demonstrated.
机译：成功证明了纳米多孔银微结构（np-AgMs）可用作表面增强拉曼散射光谱（SERS）的单个颗粒的潜在优势，并且具有易于操作和可重复使用的附加优点。具有相互连通的孔和可控制的孔尺寸的np-AgMs是由对称的六足AgCl在NaCl溶液中，以锌（Zn）为牺牲金属，通过电流置换反应制备的。 np-AgMs的清洁表面可实现快速表面功能化，易于处理和样品制备，因为不会发生颗粒聚集。可以使用普通拉曼显微镜在视觉上选择np-AgMs上的SERS采集点​​。可以实现浓度范围为10（8）-10（3）M的对氨基苯硫酚（PATP）的SERS光谱。消耗性地评估了np-AgMs的位置依赖性增强。通过有限差分时域（FDTD）计算获得的电场增强来确认信号位置相关性。另外，在几个化学再生循环之后，高度稳定的底物显示出增强的拉曼信号的微不足道的损失。最后，证明了np-AgMs在无标记的生物分子（包括血蛋白，无生色团的蛋白和低浓度500μgmL（-1）的DNA菌株）的检测中的潜在应用。

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