Journal of Environmental Nanotechnology

06-10

Authors: P. Muthuraja, V. Prabhu, M. Sethuram, M.Dhandapani, G. Amirthaganesan

The title compound,Tetrakis(hydrazine) barium(II) chloride monohydrate (TBCM) was crystallised by solvent evaporation- solution growth technique. Energy dispersive analysis of X-ray (EDAX) and elemental analysis confirmed the stoichiometry of the compound. FTIR spectral study has been performed to identify the presence of various functional groups. The optical transmittance window and the lower cut off wavelength of the TBCM have been identified by UV-Vis-NIR studies. The proton configuration of TBCM is confirmed by 1H NMR Spectroscopy. The sharp Bragg peaks of powder X-ray diffraction pattern show crystalline nature of the compound. Thermogravimetry (TG), Differential thermal analysis (DTA) and low temperature differential scanning calorimetry (DSC) were used to study thermal properties of the compound. Kurtz powder test with Nd:YAG laser radiation shows a considerable second harmonic generation by TBCM. Keywords: FT-IR; NLO; NMR; Solvent evaporation; Thermogravimetry.

15-20

Authors: S. Karthikeyan, S. Kalaiselvan, D. Manorangitham, S. Maragathamani

Multi-walled carbon nanotubes were synthesized using methyl ester of Madhucalongifolia oil over Fe-Mo impregnated alumina support at 650 C under N2 atmosphere at normal pressure.Structural characterizations have been done by Field Emission Scanning Electron Microscopy (FESEM), High Resolution Transmission Electron Microscopy (HRTEM) and Raman Spectroscopic analysis. We confirmed that well graphitized multi-walled carbon nanotubes were nicely grown on the chosen catalytic supporting material. The diameter of the carbon nanotubes obtained were between 30 and 40 nm. Keywords: Carbon nanotubes; FESEM; HRTEM; Madhucalongifolia oil; Spray-pyrolysis.

28-33

Authors: S. Cheemadan, K. Keerthana, M. C. Santhosh Kumar*

We have deposited PbS and Al doped PbS thin films by chemical bath deposition. Lead acetate and thiourea were used as sources of Pb2+ and S2- respectively. The films were deposited at a pH of 12.5. The deposited films were further annealed at three different temperatures 250 p C, 300 p C, 350 p C. The structural analysis reveals that PbS has a preferential growth at (200) planes and high crystalline PbS were obtained when the films were annealed at 300p C. Crystallite size for all the films varies from 30 to 50 nm. SEM analysis shows almost dense spherical and uniform grains were distributed upon the surface of the film. The Aluminium concentration were varied from (1,2,3 and 4 at %). The electrical conductivity of the Al doped PbS films increases upto to 3 at % and then it decreases at 4 at %. All films exhibits highly stable p-type behavior with maximum conductivity for 3% Al doped PbS films which is 13.32(cm)-1. Thereby it is concluded that 3% Al is the opimum concentration for the doping for PbS films and can be used for the application of IR detectors and sensors. Keywords: Chemical bath deposition (CBD); PbS.q

41-44

Authors: S. Shri Prasad*, D. Arun kumar, J. Madhavan

Titanium dioxide TiO2 nano particles of size around 13nm were synthesized by sol-gel method using titanium (IV) isopropoxide, isopropyl alcohol and NH3 precursors. The XRD diffraction pattern shows the anatase structure of TiO2 and FESEM shows the particle size of TiO2 is 13 nm. Nanostructured TiO2 thin films were prepared by doctor blade method on an indium tin oxide (ITO) coated glass substrate. The mesoporous TiO2 thin film was sensitized by cadmium sulfide (CdS) by successive ionic layer absorption and reaction (SILAR) method. CdS sensitized solar cell was fabricated by following standard dye-sensitized solar cell fabrication method. It was tested under standard illumination 1.5 AM,100mW cm-2. The photo energy conversion efficiency of the CdS sensitized solar cell was observed as 1.31%. Keywords: Titanium dioxide; Sol-gel; Doctor-blade; Solar cell; Cadmium sulfide.

51-56

Authors: R. Amiruddin1, Akshay Srinivas2, C. S. Sujith Kumar3, M. C. Santhosh Kumar4*

We have deposited undoped ZnO and 3% Al doped ZnO layers upon stainless steel (SS 304) substrates to study the hydrophobic nature of the surface. The ZnO layers were deposited at 673K by spray pyrolysis. Then the prepared films were annealed at various temperature like 723K, 773K, 873K and 973K. The structural and compositional analysis shows that the ZnO has a preferential growth along (002) planes. By contact angle measurement, it is revealed that annealed samples at 723K for both ZnO as well as 3% Al doped ZnO surfaces exhibits maximum contact angle of 120.59 and 125.97 respectively, which shows that the surfaces are hydrophobic. The photoluminescence spectra show that there are blue and green emission peaks in all samples. Thus, the hydrophobic ZnO thin films can be of great importance in commercial application as transparent self-cleaning surfaces. Keywords: Contact angle; Hydrophobicity; ZnO.��

62-67

Authors: M. Saravanabhavan, V. Murugesan, M. Sekar1*ine

A new class of heterocyclic compound, substituted 2-methyl-3,4,5,10-tetarahydro-pyrrolo [3,2-a]carbazole-1-ethyl carboxylate derivatives have been prepared from 1-oxo-1,2,3,4,-tetrahydrocarbazoles. The structural features were determined by analytical and spectral techniques. DNA binding study of the compounds was investigated by absorption titration experiments which indicated that the compounds showed good binding affinity to CT-DNA via intercalation. Keywords: 1-oxo-1,2,3,4-tetrahydrocarbazole; DNA binding; Ethylaceto acetate; EI mass spectroscopy; NMR spectroscopy.