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Rathinamala I.,Vvvanniaperumal College For Women | Pandiarajan J.,Nanoscience Research Laboratory | Jeyakumaran N.,Nanoscience Research Laboratory | Prithivikumaran N.,Nanoscience Research Laboratory
International Journal of ChemTech Research | Year: 2014

Nanocrystalline Cadmium Sulphide (CdS) thin films were fabricated by employing an in expensive, simplified sol- gel spin coating technique on microscopic glass substrates. The effect of annealing time on surface morphological, structural and optical properties of the films was studied. SEM studies reveal that the grains are spherically shaped and distributed uniformly over the entire surface of the substrate. The crystallite size obtained through the XRD analysis was found to increase with increase in annealing time, varying from 6.1 nm to 9.3 nm. The films show a predominant hexagonal crystal phase with (0 0 2) orientation plane. The UVVisible spectral analysis showed that the band gap value decreased with increase in annealing time. These surface morphological, structural and optical study results suggest that the nanocrystalline CdS thin films could be a potential candidate for designing optoelectronic devices.

Malliga P.,Vvvanniaperumal College For Women | Pandiarajan J.,VHNSN College | Prithivikumaran N.,VHNSN College | Neyvasagam K.,Madura College
Proceedings of the International Conference on "Advanced Nanomaterials and Emerging Engineering Technologies", ICANMEET 2013 | Year: 2013

Titanium Dioxide (TiO2) thin films have been prepared from solution of TTIP (Titanium Tetra Isopropoxide), acetic acid and ethanol on glass substrates by sol - gel dip coating technique. The films coated for different coating cycles were annealed at a temperature of 450°C for one hour. The annealed films were characterized by X - Ray diffraction (XRD) method, UV - Visible and Photoluminescence (PL) spectroscopy, Field Effect Scanning Electron Microscopy (FESEM) and Energy Dispersive X - Ray Analysis (EDAX). From XRD analysis, the crystallite size was found to increase from 19.4 nm to 71.3 nm and the phase changes from anatase to rutile with increase in the number of coating cycles. The TiO2 thin films have high transparency in the visible range.The transmittance and the optical band gap found to reduce with increase in number of coating cycles. The PL spectra of TiO2films have two peaks at 485 nm and 530 nm and intensity increases with increase in coating cycles. Surface morphology from FESEM images reveal that the films are becoming denser and roughness increases with increase in the number of coating cycles. These results suggest that the nanocrystalline TiO2 thin films are attractive material for photo catalytic applications. © 2013 IEEE.

Mano Priya M.,Sri Kaliswari College | Karunai Selvi B.,Vvvanniaperumal College For Women | John Paul J.A.,Sri Kaliswari College
Digest Journal of Nanomaterials and Biostructures | Year: 2011

Development of reliable and eco-friendly processes for synthesis of metallic nanoparticles is an important step in the field of application of nanotechnology. In this study, we report the synthesis of silver nanoparticles using the leaf extracts of Euphorbia hirta and Nerium indicum. Synthesized particles are characterized by UV - Spectrophotometer, SEM, FTIR and X- ray diffraction analysis. The Debye-Scherrer equation was used to calculate particle sizes and the average size of the silver nanoparticles synthesized by E.hirta was 31nm and by N.indicum was 29nm. Further the synthesized silver nanoparticles were tested against common bacterial pathogens.

Malliga P.,Vvvanniaperumal College For Women | Rathinamala I.,Vvvanniaperumal College For Women | Jeya J.,Vvvanniaperumal College For Women | Prithivikumaran N.,VHNSN College | Neyvasagam K.,The Madura College
International Journal of ChemTech Research | Year: 2014

Rhizobium and Azotobacter are agriculturally beneficial living organisms present in biofertilizers which fix atmospheric nitrogen into Ammonia and increases soil fertility therebypromotes plant growth. UV radiations kill or inactivate microorganism thereby prevent the growth and development of the plants. Titanium dioxide (TiO2)is a wide band gap semiconductor, an efficient light harvester and has strong UV light absorbing capability. Here, we reported that the UV screening effect of TiO2 thin films as a protective layer in the enhancement of growth of Rhizobium and Azotobacter. TiO2 nanostructure thin films of different thicknesses were prepared using sol-gel dip coating method on glass substrate by different coating cycles and annealed at 350°C for one hour. It is found that the crystallite size and roughness increases with increase in number of coating cycles. Energy gap and transmittance decreases with increase in film thickness. This study showed that TiO2 thin films act as protective layer against UV radiation and enhance the survival rate of organisms.

Lakshmi G.K.,Vvvanniaperumal College For Women | Krishnaveni K.,Sri Ramasamy Naidu Memorial College
Proceedings - 2014 World Congress on Computing and Communication Technologies, WCCCT 2014 | Year: 2014

In this paper, methods for automated extraction of multiple features of cytoplasm and nuclei from cervical cytology images are described. Edges of the image are enhanced by Edge Sharpening filter. Then Gaussian mixture model using Expectation Maximization and K-means clustering is used to segment the image into its components as background, nucleus and cytoplasm. Features have been identified for both multiple and single cervical cytology cells. For multiple cell images, nucleus to cytoplasm ratio is calculated. A mixture of features like center, perimeter, area, mean intensity of nucleus and cytoplasm are extracted from cells with single nucleus. These features may be used to determine the stage of cancer. © 2014 IEEE.

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