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Articles by R. Chandiramouli
Total Records ( 6 ) for R. Chandiramouli
  V. Nagarajan , P. Gopinath and R. Chandiramouli
  The transition metal chalcogenide nanostructures of NiSe and CoSe in different states namely cationic, anionic and neutral are completely simulated and optimized successfully by B3LYP/LanL2DZ basis set. Stability of transition metal chalcogenide structures has been conversed by using calculated energy and vibrational studies. Electronic properties of NiSe and CoSe are studied in terms of HOMO-LUMO gap, electron affinity and ionization potential. The point symmetry and dipole moment of NiSe and CoSe are also reported. This study is concentrated in enhancing electronic properties of transition metal chalcogenide which is most applicable to solar cells, lithium ion batteries and as catalyst.
  S. Sriram , R. Chandiramouli and P. Gopinath
  The different structures of PbO such as hexagonal sheet, tubular, bucky ball and cone super cells were constructed and optimized using density functional theory. The total energy of PbO super cells were calculated and it is inferred that the stability of the super cells depends on the number of atoms, more number of atoms increases the stability of the super cell. The bonding capability depends on the electronic charge of the molecule. The molecular electronic configurations were analyzed using Mulliken population analysis. The electronic properties of PbO super cells were discussed in terms of density of states. The reported results will provide the information about the realistic structures of PbO super cells which helps in the synthesis of new nanomaterial.
  M. Vigneshwaran , R. Chandiramouli , B.G. Jeyaprakash and D. Balamurugan
  Cadmium oxide is the very crucial material in the field of solar cells, optoelectronic devices, flat panel displays due to its high transparency and narrow band gap. In this study, Mg doped CdO thin films were prepared using the home made spray pyrolysis unit and its structural and electrical properties were studied. The XRD results show that the grain size decreases upon increasing the dopant concentration from its broadened peak. Atomic Force Microscopy (AFM) analysis indicates that the roughness of the surface decreases upon increasing Mg concentration. The activation energy, I-V characteristics were studied using Four probe method. The results were analyzed for three different concentration of Mg doped CdO films and are reported.
  Aishwarya Viswanath , N. Nirmmala Devi , B.G. Jeyaprakash and R. Chandiramouli
  A highly transparent and conducting metal oxide (TCO) film is a compromise between low resistivity and high transmittance. In the present study, fluorine doped cadmium oxide thin films (F:CdO) as TCO film were prepared with low sheet resistance (4 Ω cm-2) and high optical transmittance (85%). F:CdO films were deposited using spray pyrolysis method with precursor concentration of 0.1 M Cadmium acetate doped with 0.002, 0.004 and 0.006 M concentration of ammonium fluoride. Substrate temperature was fixed at 250°C with precursor solution flow rate of 3 mL min-1. The structural, morphological, optical and electrical characterization of F:CdO were investigated using X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), UV-visible spectrometer and four probe method, respectively. The structural studies confirms the polycrystalline nature of film with preferential orientation along (111) plane. Morphological studies show the presence of closely packed spherical grains. The band gap obtained by optical studies was found to vary between 2.5-2.8 eV for increasing fluorine concentration. The transparence of the film is found to be high in the range of 85%. Variation of electrical and optical parameters as a function of fluorine concentration were analyzed and reported.
  D. Balamurugan , B.G. Jeyaprakash and R. Chandiramouli
  ZnS thin films on glass substrate have been prepared by home built spray pyrolysis technique at 220, 250 and 280°C. Aqueous solution of 50 mL containing zinc acetate dihydrate and thiourea salts of 1:1 M is sprayed as fine mist at a pressure of 2 kg cm-2 with flow rate of 3 mL min-1 on preheated glass substrate. Film obtained at 220°C found to be amorphous and polycrystalline at 250 and 280°C with preferential orientation along (111) plane. X-ray line broadening technique is utilized to determine the grain size and microstrain of the ZnS film. Compositional studies indicate the presence of oxygen for the film prepared at 250°C. The effect of substrate temperature on crystalline structure, surface morphology and composition were analyzed and reported.
  S. Amutha , R. Chandiramouli and B.G. Jeyaprakash
  A great deal of research efforts was directed towards investigating the physical properties of thin film in order to improve the performance of device and for finding new applications. In this study, undoped cadmium oxide and manganese doped cadmium oxide (CdO) film were prepared using home built spray pyrolysis technique. Structural properties of undoped and Mn (manganese) doped CdO films shows polycrystalline FCC (Face Centered Cubic) crystal in nature with preferential orientation along (111) plane. X-ray peak line broadening technique was adopted to estimate grain size and strain. Film resistivity was obtained using linear four probe method. From the resistivity verses temperature plot, activation energy was estimated. It was observed that the activation energy decreases as Mn concentration in the precursor solution increases. The effect of Mn level on microstructural parameters like grain size and microstrain as well as activation energy were analyzed and reported.
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