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We report hot filament thermal CVD (HFTCVD) as a new hybrid of hot filament and thermal CVD and demonstrate its feasibility by producing high quality large area strictly monolayer graphene films on Cu substrates. Gradient in gas composition and flow rate that arises due to smart placement of the substrate inside the Ta filament wound alumina tube(More)
Nano-graphene oxide (nano-GO) is a new class of carbon based materials being proposed for biomedical applications due to its small size, intrinsic optical properties, large specific surface area, and easy to functionalize. To fully exploit nano-GO properties, a reproducible method for its production is of utmost importance. Herein we report, the study of(More)
Relaxors constitute a large class of ferroelectrics where disorder is introduced by doping with ions of different size and valence, in order to maximize their useful properties in a broad temperature range. Polarization disorder in relaxors is typically studied by dielectric and scattering techniques that do not allow direct mapping of relaxor parameters,(More)
Mussel-inspired synthetic poly(dopamine) thin films from dihydroxyphenylalanine (DOPA) and lysine, structurally similar to natural melanin, have drawn extensive interest as a versatile surface functionalization and coating material for use in a broad range of applications. In order to gain a better understanding of its complex and heterogeneous polymeric(More)
The molecular models of ferroelectric polymer polyvinylidene fluoride (PVDF) film, consisting from one, two chains [-CH2-CF2-]<sub>n</sub> and for PVDF unit cell are investigated in this work. HyperChem 7.5/8.0 for all modelings as for quantum calculations as well for molecular mechanics and molecular dynamic simulations (MD) were used. The first-principle(More)
The results are based on the first principal modeling and calculations for HAP nanostructures as native as well surface modified, charged and having various defects (H and OH vacancies, H inter-nodes). HAP structures were studied using Local Density Approximation (LDA) method with calculations of Density of States (DOS) allow us analyzes the experimental(More)
Waveguide channels were produced by direct writing using UV laser radiation on the surface of thin films prepared with organic-inorganic di-ureasils hybrids doped with zirconium tetra-propoxide deposited on silica on silicon substrates. The waveguides output mode profiles were acquired for signal propagation at 635 and 980 nm. Selective mode launching was(More)
Main results of the modeling and computational studies of two the most interesting non-centro-symmetric polymorphic glycine structures: &#x03B2;-glycine (space group P2<sub>1</sub>) and &#x03B3;-glycine (space group P3<sub>2</sub>), are presented in this work. These structures reveal piezoelectric and polar properties. But the value of polarization is not(More)
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