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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-27 9:29 |
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Conference: Bucharest University Faculty of Physics 2014 Meeting
Section: Optics, Spectroscopy, Plasma and Lasers
Title:
Analysis of complex 2D topographies of plasma deposited materials by MatLab algorithms
Authors:
V. MARASCU(1, 2), E.S. BARNA(1), I. CHITESCU(3), S.D. STOICA(2) , A. LAZEA-STOYANOVA(2), G DINESCU(1,2)
Affiliation:
1) Faculty of Physics, University of Bucharest, 405 Atomistilor, 077125 Bucharest- Magurele, Romania
2) National Institute for Laser, Plasma and Radiation Physics,409 Atomistilor Street, 077125 Bucharest– Magurele, Romania
3)Faculty of Mathematics and Computer Science, University of Bucharest, 14 Academiei Street, 010014 Bucharest, Romania
E-mail
valentina.marascu@gmail.com
Keywords:
surface analysis, nanomaterials, statistics, programming, MatLab.
Abstract:
The description of complex 2D topographies of nanomaterialsis is of wide interest for reveling details like size, shape or distribution of nanostructures on surfaces. A particular case is represented by carbon nanowalls (CNW) layers, consisting of interconnected vertical walls with thicknesses in the range of tens of nm and lengths/widths of the micron size, and defining porous open architectures. The basic information on such materials is obtained from Scanning Electron Microscope (SEM) images. However, the topography of surfaces is not easy to be observed in SEM, and also a statistical characterization is not provided. Herewith, we attempted to get such information from SEM images by analyzing theirs grey levels with specific algorithms. CNW layers with various topographies were synthesized in a radiofrequency plasma jet discharge in variable conditions and their surface was investigated by Scanning Electron Microscopy. The first step in analyzing CNW’s images is to implement the Canny edge algorithms to detect the edges of the individual carbon nanowalls, then to apply a threshold and finally, to implement specific programming commands for measuring automatically the CNW size and the surface density. Also, we were able to delimitate the pores (holes) between CNW by making joints of CNW edges.With these algorithms we determined the size, number and density distributions for the carbon nanowalls and for the holes.
Acknowledgments: This work was supported by a grant of the Romanian Ministry of National Education, CNCS - UEFISCDI, project number PN-II-ID-PCE-2012-4-0629.
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