Journal
APPLIED OPTICS
Volume 53, Issue 6, Pages 1159-1165Publisher
OPTICAL SOC AMER
DOI: 10.1364/AO.53.001159
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Funding
- National Science Fund [61376121]
- CSTC [2011BB2076]
- Fundamental research Funds for the central Universities [106112013CDJZR 125502, 20003]
- Visiting Scholar Fund of Key Laboratory of Optoelectronic Technology & System, Education Ministry of China
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We demonstrated a three-dimensional (3D) surface-enhanced Raman scattering (SERS) substrate consisting of large area carbon nanotube (CNT) arrays coated by gold-sol nanoparticles. A low-cost, simple process is used to prepare Au-decorated 3D CNT arrays. The SERS enhancement from the 3D CNT arrays, and two-dimensional (2D) CNT films substrates coated by different size gold-sol nanoparticles, was experimentally verified with Rhodamine 6G as the probe analyte. The experiments showed that the 3D CNT arrays substrate has a higher Raman enhancement compared with 2D CNT arrays substrate and planar glass substrate, due to the large specific surface area of CNT arrays and more gold nanoparticles on the CNT arrays sidewalls, which contribute the electromagnetic field and Raman intensity. Meanwhile, the 3D structure could enhance the excitation light trapping in CNT arrays, consequently increasing the light interaction with Au nanoparticles. (C) 2014 Optical Society of America
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