Detection of nitrite with a surface-enhanced Raman scattering sensor based on silver nanopyramid array.
Detection of nitrite with a surface-enhanced Raman scattering sensor based on silver nanopyramid array.
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DOI：
10.1016/j.aca.2018.08.022
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发表时间：
2018-12-21
影响因子：
6.2
通讯作者：
Wu N
中科院分区：
文献类型：
--
作者：
Zheng P;Kasani S;Shi X;Boryczka AE;Yang F;Tang H;Li M;Zheng W;Elswick DE;Wu N
由于氮肥的大量使用和畜禽粪便的排放，导致水体中的亚硝酸盐化合物，营养盐污染是世界范围内的环境和健康问题。在此，在表面增强拉曼散射（Sers）传感器的基础上的等离子体金纳米星和银纳米锥阵列之间的耦合的亚硝酸盐检测。当测定中存在亚硝酸盐时，在1-萘胺官能化的银纳米吡唑和4-氨基硫酚官能化的金纳米星之间形成偶氮基团。这不仅产生用于选择性检测的Sers光谱指纹，而且在偶氮基团所在的Au纳米星和Ag纳米锥之间的差距处产生“热点”，显著地放大Sers信号。时域有限差分法（FDTD）模拟表明，在“热点”处Sers增强因子为4×1010。因此，Sers传感器实现了对水中亚硝酸盐的0.6 pg/mL的检测限，并能够在现实世界的河水样品中检测亚硝酸盐。此外，这种传感器消除了任何拉曼报告和任何昂贵的分子识别探针如抗体和适体的使用。这种高灵敏度、选择性和廉价的Sers传感器在小分子检测中具有比比色、电化学和荧光器件独特的优势。
Nutrient pollution is of worldwide environmental and health concerns due to extensive use of nitrogen fertilizers and release of livestock waste, which induces nitrite compounds in aquatic systems. Here-in a surface-enhanced Raman scattering (SERS) sensor is developed for nitrite detection based on coupling between the plasmonic gold nanostars and the silver nanopyramid array. When nitrite is present in the assay, an azo group is formed between the 1-naphthylamine-functionalized silver nanopyramids and the 4-aminothiophenol-functionalized gold nanostars. This not only generates the SERS spectral finger-print for selective detection, but also creates “hot spots” at the gap between the Au nanostars and the Ag nanopyramids where the azo group is located, amplifying SERS signals remarkably. Finite-difference time-domain (FDTD) simulation shows a SERS enhancement factor of 4×1010 at the “hot spots”. As a result, the SERS sensor achieves a limit of detection of 0.6 pg/mL toward nitrite in water, and enables nitrite detection in real-world river water samples. In addition, this sensor eliminates the use of any Raman reporter and any expensive molecular recognition probe such as antibody and aptamer. This highly sensitive, selective and inexpensive SERS sensor has unique advantages over colorimetric, electrochemical and fluorescent devices for small molecule detection.
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影响因子：
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作者：
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