Nano-structural characteristics and optical properties of silver chiral nano-flower sculptured thin films

Savaloni, Hadi; Haydari-Nasab, Fatemh; Malmir, Mariam

doi:10.1016/j.apsusc.2011.05.097

Cited by 19 publications

(9 citation statements)

References 38 publications

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“…(iii) A number of plasmon oscillation peaks can be observed in these spectra [17,31]. In a glance, it may be concluded that structures with longer arms produce higher number of peaks which appear at longer wavelengths.…”

Section: Experimental Optical Spectramentioning

confidence: 94%

“…In these figures, it can be seen that the intensity of the extinction spectra has increased considerably and its shape is also different from the rest of the measurements carried out at other azimuthal angles. (v) Manganese spectra are much smoother than those for a noble metal such as silver given in [31], and the plasmon peaks are not as sharp as those for a noble metal. This will be further discussed and are shown in our simulation work in the following sections.…”

Section: Experimental Optical Spectramentioning

confidence: 95%

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Extinction Spectra and Electric Near-Field Distribution of Mn Nano-Rod Based Sculptured Thin Films: Experimental and Discrete Dipole Approximation Results

Siabi-Garjan

Savaloni

2014

Plasmonics

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Mn columnar (nano-rod shaped) sculptured thin films including helical square, helical rectangle, and helical pentagon with different dimensions were deposited on glass substrates, using oblique angle deposition technique (OAD) together with the rotation of the substrate holder about its surface normal. Field emission electron microscope (FESEM) was used for the structural analysis. Optical spectra of the samples were measured using single beam spectrophotometer for both s-and ppolarized lights and at different incident light angles and different azimuthal angles. The discrete dipole approximation (DDA) method is used to obtain the extinction spectra for nano-rods positioned at different orientations with respect to the incidence light direction. The electric near-field distributions were also investigated for these structures. Results showed that the experimental extinction spectra of structures consisting of a combination of nano-rods (e.g., square, rectangle, and pentagon in this work) are due to overlap of spectra of single nano-rods. It is found that when the electric field of the incident light is parallel or normal to the long axis of the nanorod, the extinction is maximized or minimized, respectively. Theoretical DDA calculations showed that the latter effect is due to entrapment of light when its electric field is normal to the nano-rod axis.

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Section: Experimental Optical Spectramentioning

confidence: 94%

Section: Experimental Optical Spectramentioning

confidence: 95%

Extinction Spectra and Electric Near-Field Distribution of Mn Nano-Rod Based Sculptured Thin Films: Experimental and Discrete Dipole Approximation Results

Siabi-Garjan

Savaloni

2014

Plasmonics

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“…In order to get the structural information one may consult Figs. 2 and 3 in [58]. In Table 1 we have included the results obtained for grain size and surface void fraction for the three types of silver chiral nano-flowers produced in this work.…”

Section: Results and Discussion Fesem And Afm (Nanostructure)mentioning

confidence: 95%

“…In our earlier work [58], we reported on the structural characteristics of similar thin films obtained using FESEM and AFM analysis. Since the results of this work are similar to those reported earlier, we do not see any point in repeating such results.…”

Section: Results and Discussion Fesem And Afm (Nanostructure)mentioning

confidence: 99%

Antibacterial effect, structural characterization, and some applications of silver chiral nano-flower sculptured thin films

2015

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Silver chiral nano-flowers with 3-, 4-, and 5-fold symmetry were produced using oblique angle deposition method in conjunction with the rotation of sample holder with different speeds at different sectors of each revolution. X-ray diffraction, atomic force microscopy, and scanning electron microscopy were employed to obtain the nanostructure and morphology of the films. Their antibacterial, electrical, and hydrophobic properties were investigated. Antibacterial properties were investigated against a range of microorganisms including Escherichia coli ATCC 8739, Staphylococcus aureus ATCC 25923, and Candida albicans PTCC 5027. Electrical conductivity of these films relative to that of bulk sample is reduced by a factor of about 10 3 due to porosity, surface roughness, and anisotropic structure of these films. Hydrophobicity results show dependence on the symmetry of these chiral nano-flowers.

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“…Sculptured thin films consist of columnar structures that their growth direction is being controlled/changed by movement of substrate. Complex structures such as chiral nano-flower shaped sculptured thin films are produced and their optical properties are investigated both experimentally [9] and theoretically [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

Fabrication of graded helical square tower-like Mn sculptured thin films and investigation of their electrical properties: comparison with perturbation theory

Fakharpour

Savaloni

2017

J Theor Appl Phys

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Mn sculptured thin films were fabricated in form of graded helical square tower-like terraced sculptured Mn thin films (GHSTTS) using oblique angle deposition together with rotation of substrate about its surface normal with fixed rotation angle (90°) and a shadowing block which was fixed at the centre of the substrate holder. The anisotropy of the samples was examined by resistivity measurements at two orthogonal angles. Direct relationship is obtained between resistivity and the anisotropy of the produced samples which showed that both of these parameters increase with decreasing distance from the edge of the shadowing block. Simulation work using the perturbation theory produced results consistent with the experimental observations.

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Nano-structural characteristics and optical properties of silver chiral nano-flower sculptured thin films

Cited by 19 publications

References 38 publications

Extinction Spectra and Electric Near-Field Distribution of Mn Nano-Rod Based Sculptured Thin Films: Experimental and Discrete Dipole Approximation Results

Extinction Spectra and Electric Near-Field Distribution of Mn Nano-Rod Based Sculptured Thin Films: Experimental and Discrete Dipole Approximation Results

Antibacterial effect, structural characterization, and some applications of silver chiral nano-flower sculptured thin films

Fabrication of graded helical square tower-like Mn sculptured thin films and investigation of their electrical properties: comparison with perturbation theory

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