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Ayeshamariam A.,Khadir Mohideen College | Bououdina M.,University of Bahrain | Sanjeeviraja C.,Alagappa University
Materials Science in Semiconductor Processing | Year: 2013

In this work, various techniques such as differential scanning calorimetry-thermogravimetric analysis (DSC-TGA), Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible-near infrared (UV-vis-NIR), photoluminescence (PL), >as well as electrical and sensor techniques have been used for the characterization of indium oxide (In2O3) nanoparticles. Here, we also provide insight regarding the optical and electrical characteristics of In2O3 nanostructures. The impact of highly sensitive and fast responding gas sensors using In 2O3 nanostructures is also discussed. It is found that the as-prepared In2O3 powder is a pure single phase and is stable up to 800 °C. The size of the particles is in the range of 12 nm as determined by transmission electron microscopy (TEM). The band gap was found to vary linearly with the annealing temperature. A good sensitivity up to 400 ppm was obtained for ethanol and a mechanism is proposed. © 2013 Elsevier Ltd. All rights reserved.

Ayeshamariam A.,Khadir Mohideen College | Ramalingam S.,Avc College | Bououdina M.,University of Bahrain | Jayachandran M.,CSIR - Central Electrochemical Research Institute
Spectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy | Year: 2014

In this work, pure and singe phase SnO2 Nano powder is successfully prepared by simple sol-gel combustion route. The photo luminescence and XRD measurements are made and compared the geometrical parameters with calculated values. The FT-IR and FT-Raman spectra are recorded and the fundamental frequencies are assigned. The optimized parameters and the frequencies are calculated using HF and DFT (LSDA, B3LYP and B3PW91) theory in bulk phase of SnO2 and are compared with its Nano phase. The vibrational frequency pattern in nano phase gets realigned and the frequencies are shifted up to higher region of spectra when compared with bulk phase. The NMR and UV-Visible spectra are simulated and analyzed. Transmittance studies showed that the HOMO-LUMO band gap (Kubo gap) is reduced from 3.47 eV to 3.04 eV while it is heated up to 800 C. The Photoluminescence spectra of SnO 2 powder showed a peak shift towards lower energy side with the change of Kubo gap from 3.73 eV to 3.229 eV for as-prepared and heated up to 800 C. © 2013 Published by Elsevier B.V. All rights reserved.

Sathiq M.A.,Jamal Mohamed College Autonomous | Nasser A.J.A.,Jamal Mohamed College Autonomous | Sirajudeen P.M.,Khadir Mohideen College
E-Journal of Chemistry | Year: 2011

The influence of N-(l-morpholinobenzyl)urea (MBU) on corrosion inhibition of mild steel in 1 M HCl was studied by weight loss, effect of temperature, potentiodynamic polarization and electrochemical impedance spectroscopy. The experimental results showed that the inhibition efficiency increases with increasing of MBU concentrations but decreases with increasing temperatures. The adsorption of MBU on the mild steel surface obeyed the Temkin's adsorption isotherm. Potentiodynamic polarization curves showed that MBU acted as a cathodic inhibitor predominantly in hydrochloric acid. This was supported by the impedance measurements which showed a change in the charge transfer resistance and double layer capacitance indicating adsorption of MBU on the mild steel surface. Protective film formation against the acid attack is confirmed by SEM.

Govindarajan M.,Annamalai University | Sivakumar R.,Annamalai University | Amsath A.,Khadir Mohideen College | Niraimathi S.,Anna University
Asian Pacific Journal of Tropical Medicine | Year: 2011

Objective: To determine the larvicidal efficacy of different solvent leaf extract of Ficus benghalensis (F. benghalensis) against Culex tritaeniorhynchus (Cx. tritaeniorhynchus) and Anopheles subpictus (An. subpictus). Methods: Twenty five early third instar larvae of Cx. tritaeniorhynchus and An. subpictus were exposed to various concentrations and were assayed in the laboratory by using the protocol of WHO 2005. The larval mortality was observed after 24 h of treatment. Results: Among three solvent extracts tested the maximum efficacy was observed in the methanol extract. The LC 50 and LC 90 values of F. benghalensis against early third instar of Cx. tritaeniorhynchus and An. subpictus were 100.88, 159.76 ppm and 56.66, 85.84 ppm, respectively. No mortality was observed in controls. The chi-square values were significant at P<0.05 level. Conclusions: From the results it can be concluded the crude extract of F. benghalensis was an excellent potential for controlling Cx. tritaeniorhynchus and An. subpictus mosquito larvae. © 2011 Hainan Medical College.

Shim J.,Yeungnam University | Jyothi N.R.,Khadir Mohideen College | Farook N.A.M.,Khadir Mohideen College
Asian Journal of Chemistry | Year: 2013

In this paper, we reviewed antimalarial, antibacterial, antitrypanosomal and antiviral properties of thiosemicarbazones and their metal complexes reported since 2008.

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