Large-Scale Fabrication of Ultrasensitive and Uniform Surface-Enhanced Raman Scattering Substrates for the Trace Detection of Pesticides.
Large-Scale Fabrication of Ultrasensitive and Uniform Surface-Enhanced Raman Scattering Substrates for the Trace Detection of Pesticides.
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大规模制造用于农药痕量检测的超灵敏且均匀的表面增强拉曼散射基底
DOI：
10.3390/nano8070520
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发表时间：
2018-07-12
期刊：
影响因子：
--
通讯作者：
Wu W
中科院分区：
文献类型：
--
作者：
Zhu J;Lin G;Wu M;Chen Z;Lu P;Wu W
技术从实验室转化为实际应用需要满足经济可行性和操作简单性的要求。报道了一种制备大规模、超灵敏表面增强拉曼散射(SERS)衬底的简便方法。在这一策略中，不需要有毒化学品或复杂的仪器来制造SERS衬底。一方面，利用超低浓度的Ag+和过量的葡萄糖作为还原剂，采用改进的Tolens法制备了尺寸相对均匀的纳米银。另一方面，当一滴胶体纳米银在水平固体表面干燥时，液滴在重力作用下变得粘稠，变成层状结构，并变硬。在蒸发过程中，毛细管流受到粘性葡萄糖溶液的粘性阻力的影响。因此，咖啡环效应被消除，导致了银纳米颗粒的均匀沉积。用这种方法在玻璃衬底上形成孔状聚二甲基硅氧烷(PDMS)结构形成的阵列势垒板上形成了平坦的Ag纳米颗粒基SERS活性薄膜，便于检测。这些底物的表面增强拉曼光谱活性使我们的检测下限达到了10−14M罗丹明6G和10−10M福美双(农药)。
Technology transfer from laboratory into practical application needs to meet the demands of economic viability and operational simplicity. This paper reports a simple and convenient strategy to fabricate large-scale and ultrasensitive surface-enhanced Raman scattering (SERS) substrates. In this strategy, no toxic chemicals or sophisticated instruments are required to fabricate the SERS substrates. On one hand, Ag nanoparticles (NPs) with relatively uniform size were synthesized using the modified Tollens method, which employs an ultra-low concentration of Ag+ and excessive amounts of glucose as a reducing agent. On the other hand, when a drop of the colloidal Ag NPs dries on a horizontal solid surface, the droplet becomes ropy, turns into a layered structure under gravity, and hardens. During evaporation, capillary flow was burdened by viscidity resistance from the ropy glucose solution. Thus, the coffee-ring effect is eliminated, leading to a uniform deposition of Ag NPs. With this method, flat Ag NPs-based SERS active films were formed in array-well plates defined by hole-shaped polydimethylsiloxane (PDMS) structures bonded on glass substrates, which were made for convenient detection. The strong SERS activity of these substrates allowed us to reach detection limits down to 10−14 M of Rhodamine 6 G and 10−10 M of thiram (pesticide).
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