Enhanced Raman Scattering of Ultramarine on Au-coated Ge/Si-nanostructures
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Semiconductor self-assembled Ge-on-Si quantum dot structures coated with Au film were successfully employed as surface-enhanced Raman scattering (SERS) substrates to characterize ultramarine blue inorganic art pigment. To assign the bands and to reveal the enhancement mechanisms, the quantum-chemical calculations of vibration spectra of linear and cyclic model compound of SiO4 and AlO4 tetrahedra were carried out. The overtones are observed in the SERS spectra and the unharmonicity constants were estimated. The development of a series of new bands in SERS spectra of ultramarine are discussed in terms of electro-optical unharmonicity.
KeywordsSurface-enhanced Raman scattering Self-organized Ge/Si nanostructures Au film Ultramarine Overtones Unharmonicity constants
Helpful discussions with K. Kneipp and D. Guzatov are greatly acknowledged. The work has been supported Belarusian National Program “Crystalline and Molecular Structures” and Swiss Program “SCOPE”.
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