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2 Materials Science Poland

2 2020

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Surface micromorphology characterization of PDI8-CN2 thin films on H-Si by AFM analysis

Ţălu Ştefan, Kulesza Slawomir, Bramowicz Miroslaw, Solaymani Shahram, Ţălu Mihai, Nezafat Negin Beryani, Rezaee Sahar

Materials Science Poland

2020

Vol. 38, No. 2

334--340

A nanoscale investigation of three-dimensional (3-D) surface micromorphology of archetypical N, N0- bis (n-etyl) x:y, dicyanoperylene- 3, 4:9, 10 bis (dicarboximide) (PDI8-CN2) thin films on H-Si substrates, which are applicable in n-type semiconducting compounds, has been performed by using fractal analysis. In addition, surface texture characteristics of the PDI8-CN2 thin films have been characterized by using atomic force microscopy (AFM) operated in tapping-mode in the air. These analyses revealed that all samples can be described well as fractal structures at nanometer scale and their three dimensional surface texture could be implemented in both graphical models and computer simulations.

Surface micromorphology analysis of Cu/Ni nanocomposite thin films by power spectra density and fractal geometry

Nikpasand Kimia, Elahi Seyed Mohammad, Sari Amir Hossein, Boochani Arash

Materials Science Poland

2020

Vol. 38, No. 2

328--333

Copper (Cu) and nickel (Ni) nanoparticles have been grown simultaneously on glass and silicon substrates by RF sputtering method to form three Cu/Ni nanocomposites at different deposition times. The existence of Cu and Ni peaks in the X-ray diffraction (XRD) profiles confirms the crystalline structure of samples with Cu and Ni atomic content which have also been characterized by Rutherford backscattering (RBS) method. Moreover, the structural and morphological properties of the prepared nanocomposites have been compared with respect to their morphologies by means of atomic force microscopy (AFM) analysis. In order to compare the surface roughness over different spatial frequency ranges and evaluate surface quality, power spectral density (PSD) of each sample has been extracted from AFM data and also, the experimental and theoretical results have been compared. The fractal nature of these nanocomposites has been finally discussed.