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Black-CuO: surface-enhanced Raman scattering and infrared properties. 2015

Armandas Balčytis, and Meguya Ryu, and Gediminas Seniutinas, and Jurga Juodkazytė, and Bruce C C Cowie, and Paul R Stoddart, and Massimiliano Zamengo, and Junko Morikawa, and Saulius Juodkazis
Faculty of Science, Engineering and Technology, Swinburne University of Technology, John Street, Hawthorn, VIC 3122, Australia. abalcytis@swin.edu.au and Center for Physical Sciences and Technology, A. Goštauto 9, LT-01108 Vilnius, Lithuania.

Large surface area samples of nanotextured black CuO were prepared by chemical etching of Cu for use in surface-enhanced Raman scattering (SERS). The SERS intensity of a self-assembled monolayer (SAM) of thiophenol was proportional to the thickness of a nanoscale-conformal Au film deposited by magnetron sputtering over the black CuO. A very high SERS yield of ∼10(4) counts per s per mW was observed for the thiophenol SAM on the thickest Au films studied here. Synchrotron X-ray photoelectron spectroscopy was used to confirm that the surface of the chemically etched Cu was covered by high purity CuO. IR spectral characterization of the black CuO showed a close to linear increase in reflectivity from 25 to 100% over the range of 4000-500 cm(-1) wavenumbers (or 2.5-20 μm in wavelength). Sensing applications and thermal effects in SERS are discussed.

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