In this paper a extented SSH model Hamilton: H = H~ SSH H_Int ,where H~PPP (π-electron Correlation) H~Hubbard (coulombic interaction)was proposed, which the electronic correlation and Coulombic interaction explicitly included and simple discussion on some properties of the new Hamiltonian was performed

Solitons on conducting polymers

The conductivity of an $n$-type semiconductor has been calculated in the region of low-temperature $T$ and low impurity concentration ${n}_{D}$. The model is that of phonon-induced electron hopping from donor site to donor site where a fraction $K$ of the sites is vacant due to compensation. To first order in the electric field, the solution to the steady-state and current equations is shown to be equivalent to the solution of a linear resistance network. The network resistance is evaluated and the result shows that the $T$ dependence of the resistivity is $\ensuremath{\rho}\ensuremath{\propto}\mathrm{exp}(\frac{{\ensuremath{\epsilon}}_{3}}{\mathrm{kT}})$. For small $K$, ${\ensuremath{\epsilon}}_{3}=(\frac{{e}^{2}}{{\ensuremath{\kappa}}_{0}}){(\frac{4\ensuremath{\pi}{n}_{D}}{3})}^{\frac{1}{3}}(1\ensuremath{-}1.35{K}^{\frac{1}{3}})$, where ${\ensuremath{\kappa}}_{0}$ is the dielectric constant. At higher $K$, ${\ensuremath{\epsilon}}_{3}$ and $\ensuremath{\rho}$ attain a minimum near $K=0.5$. The dependence on ${n}_{D}$ is extracted; the agreement of the latter and of ${\ensuremath{\epsilon}}_{3}$ with experiment is satisfactory. The magnitude of $\ensuremath{\rho}$ is in fair agreement with experiment. The influence of excited donor states on $\ensuremath{\rho}$ is discussed.

Impurity Conduction at Low Concentrations.

Amorphous and Liquid Semiconductor 国際会議

Effect of indium and antimony doping in SnS single crystals

Biotemplated top-down assembly of hybrid Ni nanoparticles/N doping carbon on diatomite for enhanced catalytic reduction of 4-nitrophenol

Structural, optical and magnetic studies on non-aqueous synthesized CdS:Mn nanomaterials

The thermal properties of doped Azopolyester were obtained by solution casting technique. Many theories have been suggested by various thermal stability mechanisms in organic solids. Since the polymers of the present study behave like semiconductors, these theories may be extended to explain thermal stability. In this section, the thermal stability theories proposed by O'Dwyer, TGA analysis, and measurements were discussed. The thermal stability properties reveal that the conductivity is appreciable in the temperature ranging from 30°C to 70°C (303 to 343K) and when it is more than 70°C (343 K) the conductivity is drastically reduced and polymeric blends undergo a gradual weight loss in the temperature ranging from 400-800°C due to attributed loss of volatile solvents trapped in the polymer. These studies are done with the help of O'Dwyer basic theory of thermal stability.

Thermal Properties of Doped Azopolyester and its Application

In India Automobiles provide a vital infrastructure for the growth of industry and agriculture. Human civilization has inevitably relied on substantial movement of passengers and goods in a speedy manner and the volume of this has gone up enormously with massive rise in population and economic activity. The demand of higher operating speeds, greater axle loads, better riding comfort and more running safety has attracted the attention of professional talents to give a serious thought to the problem of vehicle system dynamics and to devise ways and means to achieve the above requirements through effective methods. At present, the researchers are trying to develop mathematical and computer models, which not only provide a more exact simulation but enable studies to be carried out on stability or response, comfort and optimization of the design characteristics of various components of the vehicle system. Vehicle dynamics, stability deals with the study of vehicle in motion under the action of various forces. Any vehicle comprises of linear as well as angular movements along and about the three mutually perpendicular coordinate directions x, y, z. The linear movements are longitudinal, lateral and vertical displacements and the angular movements are rolling, pitching and yawing respectively for x, y, z directions.

Mathematical Modeling and Simulation of Modern Cars in the Role of Stability Analysis

Polyaniline embedded green copper oxide (Cu2O/PANI) nanocomposite has been synthesized through in situ chemical polymerization method in acidic medium at room temperature. The structural, optical, and magnetic properties of Cu2O/PANI nanocomposite were investigated through Fourier transform infrared spectroscopy (FTIR), UV-Vis absorption spectra (UV-Vis spectra), scanning electron microscopy (SEM), photoluminescence spectra (PL), and vibrating sample magnetometer (VSM). FTIR spectra confirmed the formation of Cu2O/PANI composite through the shifting of vibrational peaks of PANI and green Cu2O nanoparticles at 825, 1142, 1299, 1499, 1573 cm−1 and 695 cm−1 respectively. SEM analysis revealed that many aggregations of well-separated irregular shape of Cu2O nanoparticles with diameter about 15–40 nm exist in the composite matrix. Optical absorbance studies further confirmed the formation of composite through the blue shift of absorption peaks of PANI and diminishing intensity peak of Cu2O. Cu2O/PANI nanocomposite demonstrates semiconducting as well as diamagnetic behavior like PANI and Cu2O nanoparticles. The nanocomposite exhibits high relative photoluminescence intensity in blue as well as green-yellow region of visible spectrum. The optical band gap value from absorption coefficient data is found to be 3.23 eV.

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Optical and Magnetic Studies on Cu2O/PANI Nanocomposite Prepared by Chemical Polymerization Method

Nano - structured conducting polyaniline has been synthesized for various reaction periods using in-situ chemical polymerization method. The as prepared Polyaniline are analyzed via structural characterization and absorption spectroscope using X-ray diffraction (XRD) and UV-Visible spectroscope (UV-Vis). The XRD results confirm the partly crystalline and amorphous nature of the polyaniline prepared at the reaction period 23h. The average size of the crystallites estimated as 13 nm by Scherrer’s formula from XRD data are consistent with particle size estimated from spectroscopic data through Meulenkamp equation. The optical absorption spectrum establishes the formation of polyaniline under nano-regime with the band edge absorption of 1.03 eV

/pdf/optical-studies-on-nano-structured-conducting-polyaniline-58mpmc9dia.pdf

K. Gopalakrishnan

Papers

Structural, optical and magnetic studies on non-aqueous synthesized CdS:Mn nanomaterials

Thermal Properties of Doped Azopolyester and its Application

Mathematical Modeling and Simulation of Modern Cars in the Role of Stability Analysis

Optical and Magnetic Studies on Cu2O/PANI Nanocomposite Prepared by Chemical Polymerization Method

Optical studies on nano-structured conducting Polyaniline prepared by chemical oxidation method