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

Savaloni, Hadi; Goli-Haghighi, Shokoofe; Babaei, Reza

doi:10.1177/0003702819841913

Cited by 11 publications

(9 citation statements)

References 51 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Combined with the observation of AFM, Raman, and XPS, the composition and Surface-enhanced Raman spectroscopy (SERS) has been widely investigated by cladding Ag and Au films onto the surface of all kinds of samples, but little work is concerned with the transition metal coating. Recently, some organic films have demonstrated the SERS behaviors, including the Mn nanostructures [31]. This suggests that the abnormal Raman peak intensity observed in MnGe/Si QDs can be attributed to the surface-enhanced Raman scattering from Mn sites.…”

Section: Resultsmentioning

confidence: 99%

High Curie Temperature Achieved in the Ferromagnetic MnxGe1−x/Si Quantum Dots Grown by Ion Beam Co-Sputtering

Duan

Yang

et al. 2022

Nanomaterials

View full text Add to dashboard Cite

Ferromagnetic semiconductors (FMSs) exhibit great potential in spintronic applications. It is believed that a revolution of microelectronic techniques can take off, once the challenges of FMSs in both the room-temperature stability of the ferromagnetic phase and the compatibility with Si-based technology are overcome. In this article, the MnxGe1−x/Si quantum dots (QDs) with the Curie temperature (TC) higher than the room temperature were grown by ion beam co-sputtering (IBCS). With the Mn doping level increasing, the ripening growth of MnGe QDs occurs due to self-assembly via the Stranski–Krastanov (SK) growth mode. The surface-enhanced Raman scattering effect of Mn sites observed in MnGe QDs are used to reveal the distribution behavior of Mn atoms in QDs and the Si buffer layer. The Curie temperature of MnxGe1−x QDs increases, then slightly decreases with increasing the Mn doping level, and reaches its maximum value of 321 K at the doping level of 0.068. After a low-temperature and short-time annealing, the TC value of Mn0.068Ge0.932 QDs increases from 321 K to 383 K. The higher Ge composition and residual strain in the IBCS grown MnxGe1−x QDs are proposed to be responsible for maintaining the ferromagnetic phase above room temperature.

show abstract

Section: Resultsmentioning

confidence: 99%

High Curie Temperature Achieved in the Ferromagnetic MnxGe1−x/Si Quantum Dots Grown by Ion Beam Co-Sputtering

Duan

Yang

et al. 2022

Nanomaterials

View full text Add to dashboard Cite

show abstract

“…Sculptured structures can be designed and fabricated under controlled deposition conditions with sharp tips and recesses with chosen numbers and sizes. Our work [23] showed that the geometry (shape and size) and symmetry of the metal substrate is as important and effective as choosing the metal itself and also cheaper metals such as Mn can produce better results than Au and Ag metals. Hence, they can have high applications in industry and medicine.…”

Section: Introductionmentioning

confidence: 88%

“…The structures of the samples produced for this work are given in our earlier work [23]. However, in order to give the facility of ease of access to these data to the reader, they are repeated here with a brief description.…”

Section: Sem and Afm; Nano-structurementioning

confidence: 99%

See 1 more Smart Citation

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

2019

Self Cite

View full text Add to dashboard Cite

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 (C 10 H 8 N 2) 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.

show abstract

“…Sculptured thin films consist of columnar structures which their growth is being controlled by movement of the substrate. Complex structures such as nano-star [24,25], chiral nano-zigzag [26], nano-square [27], chiral nano-flower [28] shaped sculptured thin films are produced, and their optical properties are investigated both experimentally [28], and theoretically [29][30][31]. 3D sculptured nanostructures fabricated by these methods have a vast area of applications such as optical filters [32], reflectors [33], polarizers [34], sensors [35,36], bio-scaffolds [37], and micro-channels [38].…”

Section: Introductionmentioning

confidence: 99%

Nano-Structural Characteristics and Optical and Electrical Properties of Obliquely Deposited Manganese Oxide Thin Films

Chahshouri

Khani

Savaloni

et al. 2021

SRPH J. Fund. Sci. Technol.

Self Cite

View full text Add to dashboard Cite

In this work, manganese oxide thin films as a graded helical square tower-like (terraced) sculptured thin films with 8, 9, and 10 arms were deposited on a glass substrate by oblique angle deposition (OAD) method. Structural and morphological characteristics of the produced samples were obtained through xray diffraction (XRD), atomic force microscopy (AFM), and field emission electron microscopy (FESEM) analyses. The optical and electrical properties of manganese oxide thin film were studied by Photoluminescence (PL), UV-visible (UV-VIS), and V-I measurement. The spectrophotometry analysis on both s-and p-polarized lights at 90° incident light angles carried out for obtaining the optical spectra of the samples. Then, it used to calculate refractive index, energy gaps, and absorption peaks. Photoluminescence spectra for MnO films showed a 2.31, 2.28, and 2.26 eV gap energy in 8, 9, and 10 arms. The electrical resistance measurements of these samples showed that the resistance has strongly dependent on the intensity and energy of the incident light. The electrical resistance of these samples was also investigated under green, blue, red, and light radiation with 100 watts/cm 2 power density.

show abstract

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

Cited by 11 publications

References 51 publications

High Curie Temperature Achieved in the Ferromagnetic MnxGe1−x/Si Quantum Dots Grown by Ion Beam Co-Sputtering

High Curie Temperature Achieved in the Ferromagnetic MnxGe1−x/Si Quantum Dots Grown by Ion Beam Co-Sputtering

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

Nano-Structural Characteristics and Optical and Electrical Properties of Obliquely Deposited Manganese Oxide Thin Films

Contact Info

Product

Resources

About