Hand-Held Femtogram Detection of Hazardous Picric Acid with Hydrophobic Ag Nanopillar SERS Substrates and Mechanism of Elasto-Capillarity
Hand-Held Femtogram Detection of Hazardous Picric Acid with Hydrophobic Ag Nanopillar SERS Substrates and Mechanism of Elasto-Capillarity
复制标题
使用疏水性银纳米柱 SERS 基底手持式飞克检测有害苦味酸及弹性毛细管作用机制
DOI：
10.1021/acssensors.6b00749
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发表时间：
2017-02-01
期刊：
影响因子：
8.9
通讯作者：
Wu, HengAn
中科院分区：
文献类型：
--
作者：
Hakonen, Aron;Wang, FengChao;Wu, HengAn
苦味酸(PA)具有不可刺激性、毒性和爆炸性，是一种严重的环境和安全风险。由于其高度的酸性和阴离子特性，在痕量和现场检测也是具有挑战性的。在这里，我们使用表面增强拉曼散射(SERS)银纳米衬底和手持拉曼光谱设备来评估在非实验室条件下对PA的传感。通过分子动力学模拟对超前弹性毛细效应进行了解释。我们获得了20ppt的SERS PA检测下限，相应的阿托摩尔量，与简单的分析方法相结合，表明该方法在现场超灵敏分析方面具有很强的竞争力。
Picric acid (PA) is a severe environmental and security risk due to its unstab e, toxic, and explosive properties. It is also challenging to detect in trace amounts and in situ because of its highly acidic and anionic character. Here, we assess sensing of PA under nonlaboratory conditions using surface-enhanced Raman scattering (SERS) silver nanopillar substrates and handheld Raman spectroscopy equipment. The advancing elasto-capillarity effects are explained by molecular dynamics simulations. We obtain a SERS PA detection limit on the order of 20 ppt, corresponding attomole amounts, which together with the simple analysis methodology demonstrates that the presented approach is highly competitive for ultrasensitive analysis in the field.