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Self-healing and self-organization processes were studied in the magnetic polymer nanocomposites obtained on the basis of carbon nanoparticles doped with cobalt nanoclusters, synthesized by a unique technology of chemical vapor deposition (CVD) developed by the authors. These processes proceeded with the diffusion of magnetic nanoparticles stimulated by a combined effect of outer alternative and steady...
In this paper, a simple and inexpensive method of preparing carbon-based nanomaterials via Co-based catalyst has been demonstrated. It was shown by various optical and structural characterization that well-graphitized carbon nano-sphere can be prepared using the proposed process. Through the data extracted from Raman spectra, it was found that the as-deposited samples showed much lower Id/Ig than...
Spin-capable multi-walled carbon nanotube (MWCNT) forests that form webs, sheets, and yarns can play an important role in means for advancing various technologies. It is critical to understand the parameters that affect to grow spin-capable carbon nanotubes (CNTs) in a repeatable fashion. In this paper, we investigated the effects of carrier gases on the catalytic properties of iron (Fe) in the synthesis...
Electrospray technique is one of improved technique that is more advantageous than the other techniques. This technique does not require a complex reactor and is considered as cost effective method. The deposition quality can be controlled by adjusting the voltage, flow rate and concentration of TiO2 suspension. At various suspension concentrations like 0.40%, 0.20%, 0.10% and 0.04%, TiO2 nanoparticles...
A novel density control of carbon nanotubes is fabricated using partial oxidation of catalyst metal prior to the CNTs growth. The results show that CNTs are aligned, closely spaced, and divided into two groups with some long nanotubes protruding among short ones. Field emission improvement is achieved due to those long nanotubes are subjected less field screening effect from the surrounding nanotubes...
We discuss the influence of selenization time during the preparation of low-cost CuInSe2 (CIS) solar cells using commercially available elemental Cu and In nanoparticles. A simple non-vacuum ink deposition method is used where the nanoparticles are dispersed in alcohol and deposited onto a Mo-coated substrate in ambient atmosphere. Furthermore we investigate in this work a simple non-vacuum selenization...
We study high-order harmonic generation from plasma that are created from bulk carbon target. We obtained high-order harmonic energy in the multi-microjoule range for the 11th to the 17th harmonic. By analysing the target morphology and the plasma composition, we conclude that the intense harmonics from this bulk carbon target have the same origin as those from nanoparticles target.
Graphene nanosheets (GNs) have been investigated as a counter electrode for dye-sensitized solar cells (DSCs). Mesoporous TiO2 films are prepared from the commercial TiO2 nano-powders by screen-printing technique on fluorine-doped tin oxide (FTO) slides. GNs are applied to substitute for platinum as counter-electrode materials. GN films are screen printed on FTO glass using a paste based on GNs dispersed...
Novel non-fragile porous conductive nanocomposite vapor sensors with variant volume porosities and specific surface areas have been fabricated from PMMA and carbon nanoparticles. Sensing films were obtained by well known dry-cast non-solvent induced phase separation (NIPS) method. Porous composite structures have been characterized by SEM, BET and water evaporation methods. Response behavior of fabricated...
We report on a novel method based on a plasma pre-treatment for controlled nanostructuration and patterning of iron catalyst particles from a continuous film in view of carbon nanotube growth. The effects of the hydrogen plasma conditions on the diameter and the density of the catalyst nanoparticles was studied and discussed. We were then able to propose a comprehensive mechanism for the metallic...
This paper reports a rapid, simple and direct method for the synthesis of gold nanoparticles (AuNPs) in polypyrrole (PPy) film, which provides a biocompatible matrix for the strong adsorption of antibodies. The electrochemical synthesis of AuNPs/PPy composite on gold or carbon electrode occurs within 20 minutes, and does not involve addition of any nanoparticles or reducing agent. This method is compatible...
Carbon nanotubes (CNTs) films were synthesized at low pressure using nickel as catalyst by thermal chemical vapor deposition with hydrogen-acetylene mixture. The Raman characteristics and morphological features of CNTs at different substrate temperatures were investigated. The variation of CNTs morphological feature mainly depends on the substrate temperatures. In the low temperature range (450-550degC),...
Iron encapsulated carbon nanoparticle - polyvinyl chloride composite films have been prepared by solvent mixing and drying method. The films were characterized by scanning electron microscope (SEM) and high resolution transmission electron microscope (HRTEM). A 5 nm thin graphitic carbon coating is observed on cubic Fe nanoparticles. The microwave absorption studies by wave guide technique in the...
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