3D Fractals as SERS Active Platforms: Preparation and Evaluation for Gas Phase Detection of G-Nerve Agents.
3D Fractals as SERS Active Platforms: Preparation and Evaluation for Gas Phase Detection of G-Nerve Agents.
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DOI：
10.3390/mi9020060
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发表时间：
2018-01-31
期刊：
影响因子：
3.4
通讯作者：
Pina MP
中科院分区：
文献类型：
--
作者：
Lafuente M;Berenschot EJW;Tiggelaar RM;Mallada R;Tas NR;Pina MP
用于化学检测的表面增强拉曼散射（Sers）技术的主要限制之一依赖于基底的均匀性、再现性和可重复使用性。在这项工作中，Sers活性平台的基础上的3D分形微结构的发展相结合的角落光刻和各向异性湿法刻蚀的硅，扩展SERS活性区域到3D，与静电驱动的Au@柠檬酸盐纳米粒子（NPs）组装，以确保均匀涂层的Sers活性NPs在整个微结构的平台。与二维平面结构相比，使用三维分形结构实现了强的Sers强度;导致R6 G的Sers增强因子比仅由扩大面积效应预测的那些增强因子上级。Au单分子层-镜面配置的Sers性能被证明为1.2 ppmV的甲基膦酸二甲酯（DMMP），一种常见的G-神经毒剂的替代品的无标记实时气相检测。由于在三维分形微结构的角落和尖端上的热点积累，DMMP的主要振动模式被清楚地识别，这是Sers技术的光谱选择性的基础。在气相中进行Sers检测的拉曼采集条件必须仔细选择，以避免对照射区域的光热效应。
One of the main limitations of the technique surface-enhanced Raman scattering (SERS) for chemical detection relies on the homogeneity, reproducibility and reusability of the substrates. In this work, SERS active platforms based on 3D-fractal microstructures is developed by combining corner lithography and anisotropic wet etching of silicon, to extend the SERS-active area into 3D, with electrostatically driven Au@citrate nanoparticles (NPs) assembly, to ensure homogeneous coating of SERS active NPs over the entire microstructured platforms. Strong SERS intensities are achieved using 3D-fractal structures compared to 2D-planar structures; leading to SERS enhancement factors for R6G superior than those merely predicted by the enlarged area effect. The SERS performance of Au monolayer-over-mirror configuration is demonstrated for the label-free real-time gas phase detection of 1.2 ppmV of dimethyl methylphosphonate (DMMP), a common surrogate of G-nerve agents. Thanks to the hot spot accumulation on the corners and tips of the 3D-fractal microstructures, the main vibrational modes of DMMP are clearly identified underlying the spectral selectivity of the SERS technique. The Raman acquisition conditions for SERS detection in gas phase have to be carefully chosen to avoid photo-thermal effects on the irradiated area.
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影响因子：
29.4
作者：
Schmidt, Michael Stenbk;Hubner, Jorg;Boisen, Anja
通讯作者：
Boisen, Anja
DOI：
10.1088/0960-1317/23/5/055024
发表时间：
2013-05-01
影响因子：
2.3
作者：
Berenschot, Erwin J. W.;Jansen, Henri V.;Tas, Niels R.
通讯作者：
Tas, Niels R.
影响因子：
2.5
作者：
Hsu, Keng H.;Back, Ju H.;Fang, Nicholas X.
通讯作者：
Fang, Nicholas X.
影响因子：
17.1
作者：
Yan, Bo;Thubagere, Anupama;Reinhard, Bjoern M.
通讯作者：
Reinhard, Bjoern M.
影响因子：
6.7
作者：
Zhao, Bin;Lu, Ya;Hao, Yaowu
通讯作者：
Hao, Yaowu