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首页> 外文期刊>Applied Spectroscopy: Society for Applied Spectroscopy >On-Line Spectroscopic Characterization of Sodium Cyanide with Nanostructured Gold Surface-Enhanced Raman Spectroscopy Substrates
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On-Line Spectroscopic Characterization of Sodium Cyanide with Nanostructured Gold Surface-Enhanced Raman Spectroscopy Substrates

机译：纳米结构金表面增强拉曼光谱基片对氰化钠的在线光谱表征

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摘要

To implement surface-enhanced Raman spectroscopy as a practical detection method, highly enhancing, stable, and reproducible substrates need to be fabricated in an efficient manner, and their performance in different solution environments should be well characterized. In this work structured porous gold films have been fabricated using colloidal crystals to template gold nanoparticles. These films were integrated into an on-line flow chamber and used to study the effects of pH and other additives on the detection of sodium cyanide. The gold films proved to be highly enhancing and were used to detect cyanide over a wide range of pH values in the concentration range of ～2 to 200 ppb. The Raman signal intensity could be increased by lowering the pH after the adsorption of cyanide, which was likely due to both a change in the ionization state and a conformational change of the bound molecules. The peak intensity could also be enhanced multifold by treating the substrate with silver nitrate. Cyanide could be removed from the substrates using hydrochloric acid, although this also passivated the structures, and the activity could only be restored partially with tannic acid. These results provide a rational method to optimize the online detection of cyanide in water.
机译：为了将表面增强拉曼光谱法作为一种实用的检测方法，需要以高效的方式制造高度增强，稳定且可重现的基板，并且应对它们在不同溶液环境中的性能进行良好的表征。在这项工作中，已经使用胶体晶体来模板化金纳米颗粒来制造结构化的多孔金膜。这些薄膜被集成到在线流动室中，并用于研究pH和其他添加剂对氰化钠检测的影响。事实证明，金膜具有很高的增强作用，可用于在〜2至200 ppb的浓度范围内的宽pH值范围内检测氰化物。拉曼信号强度可通过降低氰化物吸附后的pH值来增加，这很可能是由于离子化状态的变化和结合分子的构象变化所致。通过用硝酸银处理底物，峰强度也可以提高许多倍。可以使用盐酸从基材上除去氰化物，尽管这也会钝化结构，并且活性只能用单宁酸部分恢复。这些结果为优化在线检测水中氰化物提供了一种合理的方法。

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