Is it possible to enhance Raman scattering of single-walled carbon nanotubes by metal particles during chemical vapor deposition?
Is it possible to enhance Raman scattering of single-walled carbon nanotubes by metal particles during chemical vapor deposition?
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DOI：
10.1016/j.carbon.2014.08.069
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发表时间：
2014-12-01
期刊：
影响因子：
10.9
通讯作者：
Tang, Zikang
中科院分区：
文献类型：
--
作者：
Liu, Ming;Xiang, Rong;Tang, Zikang
我们探索了利用金属纳米颗粒增强单壁碳纳米管（SWCNTs）在高温下拉曼散射的可能性，目的是在化学气相沉积（CVD）过程中获得增强的SWCNTs原位拉曼光谱。系统优化了颗粒位置、金属类型、薄膜厚度、激发波长，以满足高温和原位测量的要求。当温度升高时，由于形貌变化和金属蒸发，Ag粒子的增强因子降低。在消除形貌相关影响后，swcnts的表面增强拉曼散射（SERS）在我们的swcnts - ag /Au体系中几乎与温度无关。最后，在实际的CVD生长中获得了具有可识别RBM峰的原位增强光谱。讨论了相对较低的增强因子背后的机理。(C) 2014 Elsevier Ltd.版权所有。
We explore the possibility of using metal nano-particles to enhance the Raman scattering of single walled carbon nanotubes (SWCNTs) at high temperatures, with the aim of obtaining enhanced in situ Raman spectra of SWCNT during chemical vapor deposition (CVD). Particle position, metal type, film thickness, excitation wavelength are systematically optimized to meet the requirements for high temperature and in situ measurements. Au particles provide a weak but stable enhancement up to 1000 degrees C, while the enhancement factors of Ag particles decrease at elevated temperatures due to morphology change and metal evaporation. After the morphology relating effects are eliminated, surface enhanced Raman scattering (SERS) of SWCNT is confirmed to be almost temperature independent in our SWCNT-Ag/Au system. Finally, in situ enhanced spectra with identifiable RBM peaks are obtained in a realistic CVD growth of SWCNTs. The mechanism behind the relatively low enhancement factor is also discussed. (C) 2014 Elsevier Ltd. All rights reserved.