Highly sensitive fibre surface-enhanced Raman scattering probes fabricated using laser-induced self-assembly in a meniscus.
Highly sensitive fibre surface-enhanced Raman scattering probes fabricated using laser-induced self-assembly in a meniscus.
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DOI：
10.1039/c5nr06773a
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发表时间：
2016-05
期刊：
影响因子：
6.7
通讯作者：
Ye Liu;Zhulin Huang;Fei Zhou;Xing Lei;B. Yao;G. Meng;Q. Mao
中科院分区：
文献类型：
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作者：
Ye Liu;Zhulin Huang;Fei Zhou;Xing Lei;B. Yao;G. Meng;Q. Mao
光纤表面增强拉曼散射（Sers）探针具有结构紧凑、灵敏度高、可远程检测、重复性好等优点，具有广泛的应用前景。然而，利用现有的制备技术，很难实现简单、低成本、高通量的高灵敏度、高重复性的光纤Sers探针的制备，限制了其实际应用。本文报道了一种简单、低成本的利用激光诱导自组装实现高灵敏度、高重复性光纤Sers探针快速制备的方法。通过将纤维刻面提升到预先合成的纳米颗粒胶体上方，可以在液体的表面张力的帮助下形成弯月面。使用由纤维引导的诱导激光的照射，对弯月面中的纳米颗粒的局部热效应控制纤维探针的生长，并且紧密间隔的纳米颗粒之间的电磁相互作用有助于纳米颗粒簇在纤维端面上的布置。所制备的纤维探针显示出非常高的Sers灵敏度为10（-10）M的对-氨基苯硫酚使用便携式的拉曼光谱仪与短的积分时间为2秒。它们还表现出优异的重复性，对于相同探针的不同检测，Sers峰强度的相对标准偏差<2.8%，对于相同条件下制备的不同光纤探针，SERS峰强度的相对标准偏差为7.8%。
Fibre surface-enhanced Raman scattering (SERS) probes have the advantages of flexibility, compactness, remote sensing capability and good repeatability in SERS detection and thus have a range of different applications. However, it is difficult to realize simple, low-cost and high-throughput preparations of fibre SERS probes with high sensitivity and desirable repeatability using the currently available fabrication techniques, which restricts their practical applications. We report here a simple, low-cost method using laser-induced self-assembly to realize the fast fabrication of fibre SERS probes with high sensitivity and excellent reproducibility. By lifting the fibre facet above a pre-synthesized nanoparticle colloid, a meniscus can be formed with the help of the surface tension of the liquid. Using irradiation from an induced laser guided by the fibre, localized thermal effects on the nanoparticles in the meniscus control the growth of the fibre probes and the electromagnetic interactions among the closely spaced nanoparticles assist the arrangement of nanoparticle clusters on the fibre facet. The prepared fibre probes showed a very high SERS sensitivity of 10(-10) M for p-aminothiophenol using a portable commericial Raman spectrometer with a short integration time of 2 s. They also showed excellent repeatability with relative standard deviations <2.8% in the SERS peak intensities for different detections with the same probe and 7.8% for different fibre probes fabricated under the same conditions.