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Nonlinear Plasmonic Sensing for Label-Free and Selective Detection of Mercury at Picomolar Level.
ACS Sensors ( IF 8.2 ) Pub Date : 2020-02-24 , DOI: 10.1021/acssensors.9b02404 Mrigank Singh Verma 1 , Manabendra Chandra 1
ACS Sensors ( IF 8.2 ) Pub Date : 2020-02-24 , DOI: 10.1021/acssensors.9b02404 Mrigank Singh Verma 1 , Manabendra Chandra 1
Affiliation
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We present the concept of a nonlinear plasmonic sensing approach for rapid, sensitive, and label-free detection of mercury. Nonlinear plasmonic sensing of mercury relies on a systematic combination of nonlinear optics (NLO) with well-known concepts of amalgamation chemistry and plasmonic properties of gold nanorods. Exploiting the extreme sensitivity of the NLO process toward Hg-induced change in the local electric field of plasmonic nanorods, we succeed in improving the limit of detection (LOD) of mercury by 2-3 orders of magnitude as compared to the commonly used linear localized surface plasmon resonance (LSPR) based sensing. Using our method, an LOD of as low as 58 pM (11 ppt) has been achieved with high selectivity. Nonlinear plasmonic sensing aproach is found to work excellently for detecting mercury in real samples like blood plasma.
中文翻译：
非线性等离子感应，用于无标记的皮摩尔级汞检测和选择性检测。
我们提出了一种用于快速，灵敏和无标签检测汞的非线性等离子体传感方法的概念。汞的非线性等离子体感测依赖于非线性光学（NLO）与汞齐化学和金纳米棒的等离子体特性的众所周知概念的系统组合。利用NLO过程对汞诱导的等离子纳米棒局部电场变化的极端敏感性，与常用的线性局部化方法相比，我们成功地将汞的检出限（LOD）提高了2-3个数量级。基于表面等离子体共振（LSPR）的传感。使用我们的方法，已经以高选择性实现了低至58 pM（11 ppt）的LOD。发现非线性等离激元感测方法可以很好地检测实际样品（如血浆）中的汞。
更新日期：2020-02-18
中文翻译：
非线性等离子感应，用于无标记的皮摩尔级汞检测和选择性检测。
我们提出了一种用于快速，灵敏和无标签检测汞的非线性等离子体传感方法的概念。汞的非线性等离子体感测依赖于非线性光学（NLO）与汞齐化学和金纳米棒的等离子体特性的众所周知概念的系统组合。利用NLO过程对汞诱导的等离子纳米棒局部电场变化的极端敏感性，与常用的线性局部化方法相比，我们成功地将汞的检出限（LOD）提高了2-3个数量级。基于表面等离子体共振（LSPR）的传感。使用我们的方法，已经以高选择性实现了低至58 pM（11 ppt）的LOD。发现非线性等离激元感测方法可以很好地检测实际样品（如血浆）中的汞。
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