Application of Mn–Cu Helical Star-Shaped (Pine-Tree-Like) Sculpted Thin Films with Different Symmetries Using Surface-Enhanced Raman Spectroscopy (SERS)

2019 ◽  
Vol 73 (8) ◽  
pp. 879-892 ◽  
Author(s):  
Hadi Savaloni ◽  
Shokoofe Goli-Haghighi ◽  
Reza Babaei
Keyword(s):  
Thin Films ◽  
Raman Spectroscopy ◽  
Enhancement Factor ◽  
Surface Engineering ◽  
Surface Enhanced Raman Spectroscopy ◽  
Oblique Angle Deposition ◽  
Nano Structure ◽  
Pine Tree ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

In this work, the surface engineering method is used to produce Mn helical star-shaped (pine-tree-like) nanosculptured thin films with three-, four-, and fivefold symmetries on Cu substrates using an oblique angle deposition technique together with rotation of the sample holder at certain angles. Nano structure and morphologies of the produced samples were obtained by means of atomic force microscope and field emission scanning electron microscope. Raman spectroscopy of the Mn/Cu samples impregnated by 4,4′-bipyridine (C10H8N2) solution with different concentrations, zidovudine (C10H13N5O4), and L-histidine (C6H9N3O2) was performed using 532 nm laser wavelength. A high degree of enhancement is achieved on Raman spectroscopy of all of these specimens. Comparison of the surface-enhanced Raman spectroscopy (SERS) results for 4,4′ bipyridine (bipy) obtained in this work with the published literature using Ag and Au substrates in different shapes showed a significant enhancement improvement by using Mn sculptured structures. Reduction of the bipy concentration changed the enhancement factor. Enhancement factors of 107 and 105 were obtained for threefold symmetry sample using 2.885 × 10–2 and 10–3 mol L–1 bipy concentrations, respectively. Surface-enhanced Raman spectroscopy results of this work show that Mn nanostructures designed and engineered in this work can not only replace Ag and Au materials, but also provide a much higher enhancement factor.

scholarly journals Detection of overtone and combined peaks using Mn/Cu helical star-shaped (pine-tree-like) sculptured thin films in surface-enhanced Raman spectroscopy

2019 ◽  
Vol 13 (4) ◽  
pp. 305-314
Author(s):  
Reza Babaei ◽  
Shokoofe Goli-Haghighi ◽  
Hadi Savaloni
Keyword(s):  
Thin Films ◽  
Raman Spectroscopy ◽  
Surface Enhanced Raman Spectroscopy ◽  
Laser Wavelength ◽  
Oblique Angle Deposition ◽  
Sculptured Thin Films ◽  
Pine Tree ◽  
Surface Enhanced ◽  
Surface Enhanced Raman ◽  
Ring Mode

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.

Surface enhanced Raman spectroscopy by titanium nitride non-continuous thin films

2013 ◽  
Vol 531 ◽  
pp. 144-146 ◽  
Author(s):  
I. Lorite ◽  
A. Serrano ◽  
A. Schwartzberg ◽  
J. Bueno ◽  
J.L. Costa-Krämer
Keyword(s):  
Thin Films ◽  
Raman Spectroscopy ◽  
Titanium Nitride ◽  
Surface Enhanced Raman Spectroscopy ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

scholarly journals Optimal Size of Gold Nanoparticles for Surface-Enhanced Raman Spectroscopy under Different Conditions

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Seongmin Hong ◽  
Xiao Li
Keyword(s):  
Gold Nanoparticles ◽  
Raman Spectroscopy ◽  
Enhancement Factor ◽  
Surface Enhanced Raman Spectroscopy ◽  
Total Surface Area ◽  
Optimal Size ◽  
Effective Surface ◽  
Sers Substrates ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

Gold nanoparticles have been used as effective surface-enhanced Raman spectroscopy (SERS) substrates for decades. However, the origin of the enhancement and the effect of the size of nanoparticles still need clarification. Here, gold nanoparticles with different sizes from 17 to 80 nm were synthesized and characterized, and their SERS enhancement toward both 4-aminothiophenol and 4-nitrothiophenol was examined. For the same number of nanoparticles, the enhancement factor generated from the gold nanoparticles increases as the size of nanoparticles increases. Interestingly, when the concentration of gold or the total surface area of gold nanoparticles was kept the same, the optimal size of gold nanoparticles was found out to be around 50 nm when the enhancement factor reached a maximum. The same size effect was observed for both 4-aminothiophenol and 4-nitrothiophenol, which suggests that the conclusions drawn in this study might also be applicable to other adsorbates during SERS measurements.

scholarly journals High optical enhancement in Au/Ag alloys and porous Au using Surface-Enhanced Raman spectroscopy technique

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
C. Awada ◽  
C. Dab ◽  
M. G. Grimaldi ◽  
A. Alshoaibi ◽  
F. Ruffino
Keyword(s):  
Raman Spectroscopy ◽  
Enhancement Factor ◽  
Specific Area ◽  
Surface Enhanced Raman Spectroscopy ◽  
Gold Nanostructures ◽  
Localized Surface Plasmon ◽  
Porous Gold ◽  
Alloy Particles ◽  
Surface Enhanced ◽  
Surface Enhanced Raman

AbstractWe report high optical enhancement in Ag/Au alloys and porous gold nanostructures using Surface Enhanced Raman Spectroscopy (SERS) technique. Scanning electron microscopy investigation shows the formation of Ag/Au alloys particles during irradiation of Ag–Au bilayer deposited on FTO (SnO2:F) substrate by laser fluency equal to 0.5 J/cm2 or 1.0 J/cm2 with 12 ns laser pulse duration. The dealloying process of these Au–Ag alloy particles leads to the formation of Au nanoporous particles. The obtained nanostructures were studied with SERS and revealed a promising enhancement factor in porous Au nanostructure and tunability of localized surface plasmon resonance. The highly dense strong hot spots and large specific area in porous structure of gold nanostructures is the origin of the highly enhancement factor observed experimentally and theoretically. A very good agreement between simulation and experimental results was found confirming the potential of Au/Ag alloys and particularly porous gold nanostructure in SERS application.

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