Negin Beryani Nezafat

ORCID: 0000-0003-1636-5146
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About
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Research Areas
  • Surface Roughness and Optical Measurements
  • Dental materials and restorations
  • ZnO doping and properties
  • Adhesion, Friction, and Surface Interactions
  • Laser-induced spectroscopy and plasma
  • Force Microscopy Techniques and Applications
  • Cultural Heritage Materials Analysis
  • Boron and Carbon Nanomaterials Research
  • Laser Material Processing Techniques
  • MXene and MAX Phase Materials
  • Copper-based nanomaterials and applications
  • Graphene research and applications
  • Advanced Sensor Technologies Research
  • Gas Sensing Nanomaterials and Sensors
  • Electronic and Structural Properties of Oxides
  • Diamond and Carbon-based Materials Research
  • Advanced Measurement and Metrology Techniques
  • Heusler alloys: electronic and magnetic properties
  • Advanced Surface Polishing Techniques
  • Advanced Photocatalysis Techniques
  • 2D Materials and Applications
  • Oral microbiology and periodontitis research
  • Mercury impact and mitigation studies
  • Ion-surface interactions and analysis
  • Complex Systems and Time Series Analysis

Institute for Research in Fundamental Sciences
2020-2021

Islamic Azad University of Kermanshah
2013-2020

Islamic Azad University Kerman
2013-2020

Islamic Azad University, Science and Research Branch
2012-2019

Islamic Azad University South Tehran Branch
2018-2019

Islamic Azad University, Tehran
2012

This paper analyses the three-dimensional (3-D) surface morphology of thin films Fe on Cu nanoparticles (NPs) synthesized by direct-current (DC) magnetron sputtering deposited glass substrates. Four samples coated with copper and iron were used as research materials. Thin obtained means a DC reactive method. The coating each sample was 55 nm thick. In addition, second, third, fourth had iron, thickness 40, 55, 70 nm, respectively. images using an atomic force microscope operating in...

10.1021/acs.jpcc.5b04676 article EN The Journal of Physical Chemistry C 2015-07-03

As the environment and human body face harmful effects of toxic gases such as carbon monoxide (CO), many research efforts have been directed toward elimination these species through various adsorption processes. Unique properties γ-Al2O3 in CO capture led us to prepare SnO2/Al2O3, Ni/Al2O3, SnO2/Ni/Al2O3 composite nanocrystalline films using roll-coating method. The crystalline structure morphology coatings were investigated X-ray diffraction field-emission scanning electron microscopy,...

10.1021/acs.jpcc.9b11148 article EN The Journal of Physical Chemistry C 2020-01-17

The morphological parameter of a thin film surface can be characterized by power spectral density (PSD) function which provides better description on topography rather than the root mean square (RMS) and super structure contributions. Through present study, nanoparticle copper-carbon composite films were prepared co-deposition RF-sputtering RF-PECVD method using acetylene gas copper target. These films' roughnesses determined an atomic force microscope (AFM). carbon content was obtained...

10.1051/epjap/2013130121 article EN The European Physical Journal Applied Physics 2013-08-26

In this work, we investigated the electronic and structural properties of various defects including single Sn C vacancies, double vacancy atoms, anti-sites, position exchange Stone–Wales (SW) in SnC nanosheets by using density-functional theory (DFT). We found that monolayer can change properties. Our results show is an indirect band gap compound, with 2.10 eV. The system turns into metal for both structure vacancies. However, contained remains semiconductor direct 0.37 eV at G point. also...

10.1016/j.rinp.2017.08.049 article EN cc-by Results in Physics 2017-01-01

Abstract This work describes an analysis of titanium dioxide (TiO 2 ) thin films prepared on silicon substrates by direct current (DC) planar magnetron sputtering system in O /Ar atmosphere correlation with three‐dimensional (3D) surface characterization using atomic force microscopy (AFM). The samples were grown at temperatures 200, 300, and 400°C substrate the same deposition time (30 min) distributed into four groups: Group I (as‐deposited samples), II (samples annealed 200°C), III...

10.1002/jemt.23433 article EN Microscopy Research and Technique 2020-01-08

The aim of the present study is to verify how alternations annealing temperatures modify optical and micromorphological properties n-ZnO/p-NZO n-ZnO/p-NiO multilayers. As can be seen, analysis homojunctions hetrojunction thin films shows a red shift by increasing temperature which means that absorption edge coefficient lower values energies. Also, effective parameters on homo- such as band gap, Urbach energy, steepness parameter, skin depth have been studied their transmittance spectra....

10.1016/j.rinp.2021.104679 article EN cc-by-nc-nd Results in Physics 2021-08-20

Abstract Human tooth exhibits a structure of mixture inorganic hydroxyapatite nanocrystals and organic phases. The aim this study is to investigate different tissues human canine teeth surface along with the micro parameters each tissue. X‐ray diffraction (XRD) used amorphous or crystalline nature tissue mineral compositions structures where highest quality related enamel. surfaces are also examined by energy‐dispersive spectrometry. Moreover, factor carried out estimate crystallinity...

10.1002/jemt.23183 article EN Microscopy Research and Technique 2018-12-21

Analyzing diamond nanocrystal (DNC) thin film morphology produced by the HFCVD technique is main objective of present work. Stereometric analysis three-dimensional surface microtextures was carried out based on data obtained through atomic force microscopy (AFM), while ISO 25178-2:2012 standard applied to characterize topography. The Abbott–Firestone curve, peak count histograms, and Cartesian graphs, which were extracted AFM images, gave valuable statistical information. As can be seen,...

10.1063/5.0003866 article EN cc-by AIP Advances 2020-04-01

Determining surface topography of different tissues the molar tooth with novel analytical methods has opened new horizons in dental measurements which characterize quality dentistry. Studying topological and comparing morphology hard tissue are ultimate goals present study. Ten teeth have been chosen for investigating their characteristics through image processing techniques. The power spectral density (PSD) fast Fourier transform algorithms every containing enamel, dentin, cementum...

10.1002/jemt.23356 article EN Microscopy Research and Technique 2019-08-10

Abstract The objective of this study was to evaluate the effect two photoactivation modes dental LED light‐curing unit (LCUs) (conventional and “Soft Start” mode) on surface texture parameters resin‐based nanocomposites. LCUs were considered as standard devices in contemporary practice. Atomic force microscopy (AFM) applied investigate morphology 90 × μm 2 scanning area through 2D multifractal detrended fluctuation analysis with computational algorithms basis. In order compare 3D roughness...

10.1002/jemt.23123 article EN Microscopy Research and Technique 2018-10-01

Abstract The purpose of the present study was to investigate a new method evaluate micro topography and morphology hard tissue canine teeth using an atomic force microscope (AFM). For this aim, three extracted human were applied. unpolished surfaces analyzed with AFM images 15 µm × 5 area their information obtained by power spectral density (PSD) fast Fourier transform algorithm. It observed that PSD analyses extract suitable about surface morphological variations so moving from enamel...

10.1007/s40089-019-00284-8 article EN cc-by International nano letters. 2019-11-01

The sputtered copper nanoparticles (Cu NPs) on amorphous hydrogenated carbon films (CuNPs@a-C:H) were deposited a glass substrate by the codeposition method of radio-frequency (RF)-sputtering and RF-plasma-enhanced chemical vapor deposition methods. thin synthesized in different times 10, 15, 20, 25 min while other parameters constant. Rutherford back scattering measurements specified atomic content localized surface plasmon resonance peak was extracted from UV–visible spectra. To...

10.1021/acs.iecr.0c04807 article EN Industrial & Engineering Chemistry Research 2020-12-17

Abstract The physical properties of electronic devices made by 2,6‐diphenyl anthracene (DPA) are influenced the microtexture DPA surfaces. This work focused on experimental investigation 3‐D surface thin films deposited OTS (octadecyltrichlorosilane), HMDS (Hexamethyldisilasane), OTMS (octadecyltrimethoxysilane), and Si/SiO 2 (300 nm SiO thickness) substrates with 5 50 thicknesses 10 μm scan size. film surfaces were recorded using atomic force microscopy (AFM) their images stereometrically...

10.1002/jemt.23569 article EN Microscopy Research and Technique 2020-08-28

Abstract The main goal of the present work is to explore three dimensional (3‐D) atomic force microscopy (AFM) images human teeth and investigating their micromorphology. For this purpose, 10 fresh permanent canine were selected from a group 40‐year‐old men who candidate for experimental processes. Afterward, they all applied studying morphology hard tissues. tapping mode AFM was used characterize surface micromorphology on square areas 1 μm × (512 512 pts). results stereometric analysis...

10.1002/jemt.23668 article EN Microscopy Research and Technique 2021-01-06

Abstract The aim of the present study is to explore 3-D micromorphology human canine teeth materials using multifractal analysis through atomic force microscopy (AFM). surfaces ten extracted a group 40 year old men were studied (enamel, inter enamel, dentin, and cementum) by AFM images in tapping mode on square areas 1 μm × (512 512 points). surface confirm dependency their structure–property these across length scales structural architecture. Surface statistical parameters hence, approach...

10.1007/s40089-019-00293-7 article EN cc-by International nano letters. 2019-12-31

Abstract A nanoscale investigation of three-dimensional (3-D) surface micromorphology archetypical N, N0- bis (n-etyl) x:y, dicyanoperylene- 3, 4:9, 10 (dicarboximide) (PDI8-CN 2 ) thin films on H-Si substrates, which are applicable in n-type semiconducting compounds, has been performed by using fractal analysis. In addition, texture characteristics the PDI8-CN have characterized atomic force microscopy (AFM) operated tapping-mode air. These analyses revealed that all samples can be...

10.2478/msp-2020-0033 article EN Materials Science-Poland 2020-06-01
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