Abstract
Mn helical star-shaped (pine-tree-like) nano-sculptured thin films with three-, four-and fivefold symmetry on copper substrates were produced using oblique angle deposition method in conjunction with rotation of sample holder at certain angles. Raman spectroscopy of the samples which were subjected to impregnation by 4,4′-bipyridine (C10H8N2) solution was carried out by 632.8 nm wavelength laser. The analysis of the Raman spectra showed enhancement for the 4,4′-bipyridine main bands (1592 and 1297 cm−1) belonging to the C=C stretching mode, aromatic ring stretching ring and in-plane ring mode of 4,4′-bipyridine, same as results obtained for Ag nano-structures. In addition, overtone and combined peaks are detected that may be related to the particular sculptured structure of the thin films fabricated in this work and the laser wavelength used for Raman spectroscopy. UV–Vis (absorption mode) spectra showed consistent observations with the SERS results leading to important role of surface electromagnetic selection rule in intensification of SERS, in addition pointing out the importance of the effect of the size of hot spots on the frequency of the localized surface plasmonic oscillations.
Highlights
Interaction of light with matter has been a subject of interest to scientists for ages
In this work Mn was chosen as the material and fabricated nanosculptured pine-tree-like structures with different symmetries on Cu substrates
SERS investigation was carried out 4,4′-bipyridine molecules embedded on these structures
Summary
Interaction of light with matter has been a subject of interest to scientists for ages. (Second tip point of the star is made in a zigzag shape.) Stage 5 substrate was rotated by 180° to return to the position of Stage 3 and rotated by 72°, and 60 nm Mn film was deposited. (Third tip point of the star is made in a zigzag shape.) Stage 7 substrate was rotated by 180° to return to the position of Stage 5 and rotated by 72°, and 60 nm Mn film was deposited. For determination of surface plasmons, UV–Vis spectrometer (StellarNet BLACK, Comet concave grating spectrometer) was employed
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