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Title: Growth Dymanics and Plasmonic response of Silver nanoparticles deposited on nanodots nanorippled templates
Researcher: Bhatnagar M.
Guide(s): Ranjan Mukesh, Mukherjee Subroto
Keywords: nanodots
University: Nirma University
Completed Date: 16/06/2017
Abstract: The atomistic detail of silver silica interaction is studied through Molecular Dynamics. An amorphous newlineflat silica substrate is generated through the quench algorithm. A modified Buckhingam newlinepotential is used to simulate the interatomic interaction of silicon and oxygen atoms. The Ag- newlineSiO2 interaction is simulated by a simple pairwise Morse potential. The dependence of sticking newlineprobability of silver adatom to the silica surface is shown for different values of binding energy, newlinesubstrate temperature, interaction time between the adatom and the surface and the kinetic energy newlineof the incoming silver adatom. We report a number of dynamical events observed during newlinethe simulation of cluster growth on the flat silica surface for Eb = 0:2 eV . Successive deposition newlinesimulations leading to the growth of silver clusters on the flat silica surface is performed for newlineEb = 0:2 eV and Eb = 0:6 eV . The hop time for the silver adatom on the surface is calculated newlinethrough Arrhenius equation for the both values of the binding energy so as to understand the newlineobserved growth behaviour. We have also simulated the adatom surface interaction for long newlinetime scale using otf-Kinetic Monte Carlo (otf-KMC) technique to understand the cluster growth newlinefor real world time scales. newlineIn-situ Rutherford Backscattering Spectrometry (RBS) and Molecular Dynamics (MD) simulations newlinehave been used to investigate the growth dynamics of silver on a flat and the rippled silica newlinesurface. The calculated sticking coefficient of silver over a range of incidence angles shows a newlinesimilar behaviour to the experimental results for an average surface binding energy of a silver newlineadatom of 0.2 eV. This value was used to parameterise the MD model of the cumulative deposition newlineof silver in order to understand the growth mechanisms. Snapshots from deposition newlinesimulations reveal the dynamics behind the formation of silver clusters on such a surface. Both newlinethe model and the RBS results show marginal difference between the atomic concentration of newlinesilver on the flat and the rippled silica surf
Appears in Departments:Institute of Science

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03_abstract.pdf105.93 kBAdobe PDFView/Open
04_declaration.pdf412.8 kBAdobe PDFView/Open
05_acknowledgments.pdf121.81 kBAdobe PDFView/Open
06_contents.pdf128.08 kBAdobe PDFView/Open
07_list of tables.pdf188.78 kBAdobe PDFView/Open
08_list of figures.pdf135.88 kBAdobe PDFView/Open
09_abbreviations.pdf163.56 kBAdobe PDFView/Open
10_chapter 1.pdf109.44 kBAdobe PDFView/Open
11_chapter 2.pdf23.86 MBAdobe PDFView/Open
13 _chapter 3.pdf13.3 MBAdobe PDFView/Open
14_chapter 4.pdf17.09 MBAdobe PDFView/Open
15_chapter 5.pdf4.54 MBAdobe PDFView/Open
16_chapter 6.pdf8.62 MBAdobe PDFView/Open
17_summary.pdf106.4 kBAdobe PDFView/Open
18_bibliography.pdf143.79 kBAdobe PDFView/Open
1_title.pdf90.01 kBAdobe PDFView/Open
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