Journal
NANOTECHNOLOGY
Volume 23, Issue 20, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/23/20/205702
Keywords
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Funding
- National Science Foundation [CMMI 0758199, CMMI 0900419, CMMI 1126208, EPS 1004094]
- National Natural Science Foundation of China [90923039]
- Directorate For Engineering
- Div Of Civil, Mechanical, & Manufact Inn [0900419] Funding Source: National Science Foundation
- EPSCoR [1004094] Funding Source: National Science Foundation
- Office Of The Director [1004094] Funding Source: National Science Foundation
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Gold-coated horizontally aligned carbon nanotube (Au-HA-CNT) substrates were fabricated for surface-enhanced Raman spectroscopy (SERS). The Au-HA-CNT substrates, which are granular in nature, are easy-to-prepare with large SERS-active area. Enhancement factors (EFs) of similar to 10(7) were achieved using the Au-HA-CNTs as substrates for rhodamine 6G (R6G) molecules. Maximum enhancement was found when the polarization direction (E-field) of the incident laser beam was parallel to the aligned direction of the HA-CNTs. Simulations using the finite-difference time-domain (FDTD) method were carried out for the granular Au-HA-CNT samples. Enhancement mechanisms and determination of EFs were analyzed. Biological samples, including C-13-and deuterium (D)-labeled fatty acids and Coccomyxa sp. c-169 microalgae cells, were also measured using this SERS substrate. The limits of detection (LODs) of D- and C-13-labeled fatty acids on the SERS substrate were measured to be around 10 nM and 20 nM, respectively. Significantly enhanced Raman signals from the microalgae cells were acquired using the SERS substrate.
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