INVESTIGADORES
DELLA VEDOVA Carlos Omar
artículos
Título:
Study on the detection of cocaine in Argentinian banknotes by SERS
Autor/es:
PICONE, A. LORENA; VÉDOVA, CARLOS O. DELLA; ROMANO, ROSANA M.
Revista:
VIBRATIONAL SPECTROSCOPY
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2020 vol. 110 p. 103136 - 103136
ISSN:
0924-2031
Resumen:
Flexible Surface-Enhanced Raman Spectroscopy (SERS) substrates based on silver nanoparticles (AgNP) immobilized in agar gels have been developed to detect cocaine in $ 100 Argentinian banknotes by SERS spectroscopy. The AgNP were characterized by absorption spectroscopy and Scanning Transmition Electron Microscopy (STEM). The SERS substrates were first evaluated using a probe molecule, methylene blue (MB), with well-known SERS activity. The achieved limit of detection (LOD) was ∼3 pg.cm−2 (∼60 molecules/spot). SERS experiments with cocaine hydrochloride were performed using these substrates; the LOD achieved was ∼70 ng.cm−2 (0.7 fg/spot). Cocaine was detected on intentionally contaminated $ 100 Argentinian banknotes. Finally, the analysis of 10 banknotes in circulation (one of which was intentionally contaminated as a blind test) resulted in the detection of cocaine in two of the banknotes analysed.