Highly sensitive surface-enhanced Raman scattering substrate made from superaligned carbon nanotubes.
Highly sensitive surface-enhanced Raman scattering substrate made from superaligned carbon nanotubes.
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DOI：
10.1021/nl100170j
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发表时间：
2010-04
期刊：
影响因子：
10.8
通讯作者：
Yinghui Sun;Kai Liu;Jiao Miao;Zheyao Wang;Baozhong Tian;Lina Zhang;Qunqing Li;S. Fan;K. Jia
中科院分区：
文献类型：
--
作者：
Yinghui Sun;Kai Liu;Jiao Miao;Zheyao Wang;Baozhong Tian;Lina Zhang;Qunqing Li;S. Fan;K. Jia
表面增强拉曼散射（Sers）技术由于能使通常微弱的拉曼信号增强几个数量级，从而使分子的检测灵敏度提高，引起了人们的广泛关注。传统的Sers基底是通过将金属纳米颗粒放置在平面表面上来构造的。在这里，我们表明，如果用一个独特的纳米多孔表面取代平面表面，增强效果可以显着提高。通过交叉堆叠超取向碳纳米管膜，可以容易地以低成本批量制造纳米多孔表面。由于所制备的基底具有极大的比表面积和独特的零维一维纳米结构，使得基底能够检测环境中的三硝基甲苯蒸气，表现出比普通平面基底高得多的拉曼增强。这些结果不仅为超灵敏Sers基底的制备提供了新的途径，而且有助于加深对Sers现象的基本认识。
Surface-enhanced Raman scattering (SERS) has attracted wide attention because it can enhance normally weak Raman signal by several orders of magnitude and facilitate the sensitive detection of molecules. Conventional SERS substrates are constructed by placing metal nanoparticles on a planar surface. Here we show that, if the planar surface was substituted by a unique nanoporous surface, the enhancement effect can be dramatically improved. The nanoporous surface can be easily fabricated in batches and at low costs by cross stacking superaligned carbon nanotube films. The as-prepared transparent and freestanding SERS substrate is capable of detecting ambient trinitrotoluene vapor, showing much higher Raman enhancement than ordinary planar substrates because of the extremely large surface area and the unique zero-dimensional at one-dimensional nanostructure. These results not only provide a new approach to ultrasensitive SERS substrates, but also are helpful for improving the fundamental understanding of SERS phenomena.