Surface-enhanced Raman spectroscopy and correlated scanning electron microscopy of individual carbon nanotubes
Surface-enhanced Raman spectroscopy and correlated scanning electron microscopy of individual carbon nanotubes
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DOI：
10.1063/1.2816905
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发表时间：
2007-11-26
影响因子：
4
通讯作者：
Cronin, Stephen B.
中科院分区：
文献类型：
--
作者：
Kumar, Rajay;Zhou, Hao;Cronin, Stephen B.
通过在沉积银纳米颗粒之前和之后在大面积（100 μ m（2））上扫描聚焦激光光斑（直径0.5 μ m）来测量单个碳纳米管的拉曼光谱。局部区域表现出表面增强拉曼光谱（Sers）位于相对于光刻图案化的网格，允许随后的扫描电子显微镜进行。碳纳米管独特的大纵横比使纳米颗粒几何形状与Sers活性分子一起成像成为可能。通过在金属纳米颗粒沉积之前和之后测量相同的单个碳纳米管，明确地确定Sers增强因子。数据显示Sers增强因子高达134000，G带拉曼频率一致上移，纳米颗粒加热超过600摄氏度。(c)2007年，美国物理学会。
Raman spectra of individual carbon nanotubes are measured by scanning a focused laser spot (0.5 mu m diameter) over a large area (100 mu m(2)) before and after depositing silver nanoparticles. Local regions exhibiting surface enhanced Raman spectroscopy (SERS) were located with respect to a lithographically patterned grid, allowing subsequent scanning electron microscopy to be performed. The uniquely large aspect ratio of carbon nanotubes enables imaging of the nanoparticle geometry together with the SERS active molecule. By measuring the same individual carbon nanotube before and after metal nanoparticle deposition, the SERS enhancement factor is determined unambiguously. The data reveals SERS enhancement factors up to 134 000, a consistent upshift in the G band Raman frequency and nanoparticle heating in excess of 600 degrees C. (c) 2007 American Institute of Physics.