Journal
PLASMONICS
Volume 4, Issue 2, Pages 187-192Publisher
SPRINGER
DOI: 10.1007/s11468-009-9090-6
Keywords
Surface enhaced Raman scattering (SERS); Tetrodotoxin (TTX); Nanosphere lithography (NSL); Ag nanoparticle arrays; Density functional theory (DFT)
Funding
- National Taiwan Ocean University and the National Science Council of ROC [NSC 97-2112-M-019-001-MY3]
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The optical properties of tetrodotoxin (TTX), a scarce toxin with anesthetic properties, were studied using nanoparticle arrays-assisted surface-enhanced Raman scattering (SERS). The nanoparticles arrays were fabricated using nanosphere lithography and a metallic lift-off process to control the particle size, shape, and spacing in the arrays. Using density functional methods, the Raman spectrum of TTX was also calculated with Gaussian03 software. The main peaks of the spectrum are originated from the vibration of the NH2 molecule group. In the SERS experiment, we were able to measure the Raman spectrum with a TTX concentration as less as 0.9 ng/mL. This sensitivity is comparable to that from high performance liquid chromatography.
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