Time filter

Source Type

Tiruchirappalli, India

Muruganantham G.,P.A. College | Ravichandran K.,P.A. College | Saravanakumar K.,P.A. College | Ravichandran A.T.,National College Autonomous | Sakthivel B.,P.A. College
Superlattices and Microstructures | Year: 2011

Undoped and fluorine doped tin oxide films were deposited from starting solutions having different values of solvent volume (10-50 ml) by employing a low cost and simplified spray technique using perfume atomizer. X-ray diffraction studies showed that there was a change in the preferential orientation from (2 1 1) plane to (1 1 0) plane as the volume of the solvent was increased. The sheet resistance (Rsh) of undoped SnO2 film was found to be minimum (13.58 KΩ/□) when the solvent volume was lesser (10 ml) and there was a sharp increase in Rsh for higher values of solvent volume. Interestingly, it was observed that while the R sh increases sharply with the increase in solvent volume for undoped SnO2 films, it decreases gradually in the case of fluorine doped SnO2 films. The quantitative analysis of EDAX confirmed that the electrical resistivity of the sprayed tin oxide film was mainly governed by the number of oxygen vacancies and the interstitial incorporation of Sn atoms which in turn was governed by the impinging flux on the hot substrate. The films were found to have good optical characteristics suitable for opto-electronic devices. © 2011 Elsevier Ltd. All rights reserved. Source

Anandan A.,Annamalai University | Eswaran R.,Annamalai University | Doss A.,Annamalai University | Sangeetha G.,National College Autonomous | Anand S.P.,Annamalai University
Asian Journal of Pharmaceutical and Clinical Research | Year: 2012

Lucas aspera (Willd.) Linn. is a potential folklore medicinal plant (Lamiaceae) used as an antipyretic and insecticide. In this study, fatty acid esters, fatty acid amide, triterpene, diterpene alcohols and phytol were identified as the major chemical groups in the methanol fractions of L.aspera leaf extracts. Their structures were elucidated, on the basis of GC-MS data, Phytol (24.55%), 9, 12, 15-Octadecatrienoic acid, methyl ester (z, z, z) - (22.97%), n-Hexadecanoic acid (17.17%), Squalene (5.28%) and 1, 2-Benzenedicarboxylic acid, bis(2-methylpropyl) ester (4.44%). Source

Ramasamy R.,National College Autonomous
Journal of Applied Spectroscopy | Year: 2013

Solid phase FTIR and FT-Raman spectra of pyridoxazinone have been recorded in regions of 4000-50 cm-1 and 3500-100 cm-1 respectively. The spectra were interpreted by normal coordinate analysis following full structure optimizations and force field calculations based on density functional theory (DFT) using the standard B3LYP/6-31G* and B3LYP/6-311+G** method and basis set combinations. The results of the calculations are applied to simulate infrared and Raman spectra of the title compound, which showed excellent agreement with the observed spectra. © 2013 Springer Science+Business Media New York. Source

Senthamilselvi V.,Kunthavai Naachiyaar Government College for Women Autonomous | Senthamilselvi V.,AVVM Sri Pushpam College Autonomous | Saravanakumar K.,AVVM Sri Pushpam College Autonomous | Anandhi R.,AVVM Sri Pushpam College Autonomous | And 3 more authors.
Journal of Materials Science: Materials in Electronics | Year: 2012

CdS films were fabricated using Successive Ionic Layer Adsorption and Reaction (SILAR) technique from starting solutions having S:Cd ratio 1:1, 3:1, 5:1 and 7:1 and their structural, surface morphological and optical properties were investigated and compared with that of their chemical bath deposited counterparts. The X-ray diffraction profiles showed that the films have cubic crystal structure with preferential orientation along the (111) plane and the intensity of the (111) plane increases for both the techniques as the S:Cd ratio increases. The energy dispersive X-ray analysis revealed that for SILAR deposited films, the S/Cd ratio in the sample increases from 0.8308 (for S:Cd 1:1) to 1.04 (for S:Cd 7:1) as the molar concentration of sulphur in the starting solution increases. But for CBD films, the S/Cd is only ∼0.80 for all concentrations of sulphur in the starting solution. The optical band gap increases with the increase in S:Cd ratio in the starting solution in both the techniques. © 2011 Springer Science+Business Media, LLC. Source

Shanmugam P.,National College Autonomous | Pari S.,National College Autonomous
Optik | Year: 2016

Single crystals of undoped and rhodamine-B doped l-alanine acetate have grown from solution by slow evaporation method at room temperature (30 °C). The title samples were synthesized and purified by repeated re-crystallization process. Solubility of the samples in water was found at different temperatures. The crystals were characterized by single crystal X-ray diffraction and Fourier Transform Infrared Spectroscopic (FTIR) analysis. The range and percentage of optical transmission was ascertained by recording UV-vis-NIR spectra and the optical band gap was determined. The second harmonic generation behavior of the samples was tested by Kurtz-Perry powder technique. Mechanical hardness, yield strength and stiffness constant were estimated by Vickers microhardness method. Laser damage threshold values were found out using Nd:YAG laser for the grown crystals. EDAX analysis was done to identify elements present in the undoped and rhodamine-B doped l-alanine acetate crystals. Dielectric constant and dielectric loss of the samples were estimated to understand the polarization processes and insulating behavior in the samples. TG/DTA studies were carried out to find the thermal stability and photoluminescence spectra were recorded for the samples to find the optical emission bands. © 2015 Elsevier GmbH. All rights reserved. Source

Discover hidden collaborations