SYNTHESIS AND CHARACTRIZATION OF Eu2WO6 BY HYDROTHERMAL METHOD

Metal oxide nanocomposites play an important role in nanoworld. Materials with photo catalytic properties are widely studied because of their numerous applications. These applications include solar cell application and other photodegradation properties too. This photodegradation property include the waste water management too. This paper reports the synthesis and characterization of europium tungstate nanocomposites and explain their photocatalytic applications. The synthesis is carried out with hydrothermal method. XRD, FTIR, SEM and PL studies have been used to study the structural and morphological and optical studies. From these characterizations the sample is studied and further studied for its future uses.


RESULT AND DISCUSSION XRD RESULT
XRD analysis of the prepared sample was taken out using the instrument XPERT-PRO using Cukα radiation. The generation voltage and current was setup at 30mA and 40 kv respectively. The samples were scanned in the 2 ranges in 0˚-90˚ranges in continuous scan mode. By continuous scan mode, the XRD analysis of the Eu2WO6 nanocomposites exhibited Bragg's reflections, which was indexed on the basis of the hexagonal phase. The diffraction peaks can be found out using the value of 2 in a given sample [7][8]. From this sample, the wavelength values can be in the range of 1.5406 A˚. The measurement temperature 25˚C and the specimen length can be measure as 10 mm also can be used in this material for the measurement. The sample's XRD analysis graph are shown in a below figure 1 Fig 1 XRD pattern of the sample Where, D particle diameter K is a constant equal to 0.9 λ wavelength of the X-ray source β Full width half maximum(FWHM) half diffraction angle From this equation the strong sharp peaks indicates the good crystalline of Eu2WO6.The size of Eu2WO6 by using Debye-Scherer's equation .From this peak ,the highest peak was obtained in 2 value 28.2658 with a hkl value (200).The total mean size of the crystal grain is estimated about 27.4nm so it shows that the material is in average particle size.

FTIR RESULT
The FTIR technique is used to identify the functions groups that are present in the sample. The FTIR spectrum is recorded in alpha T, Bruker, Germany using ATR technique. The range of frequency in between 4500-500 cm -1 to identify functional groups in the synthesized particles. The FTIR peaks obtained in the present study are presented in figure 2. FTIR peaks are assigned to corresponding functional groups which is present in the sample Eu2WO6.

SEM RESULT
The morphological structures were studied by using scanning electron microscope, JOEL model: JSM-6390 LV. By using this instrument, the sample is taken into aluminum stubs inside the chamber and it can be analyzed for studying the morphological structure of the sample. The voltage which is used for analyzing was 20 kV for imaging process. The obtain images of sample by using SEM were shown below.  fig 3), the result can be revealed that the images are produced with the high acceleration voltage which is focus to the surface change of europium tungstate oxide nanocomposites [6]. The lateral dimensions of the sample are taken approximately from 1µm to 50 µm range for taking the image of the sample. The average particle size of the sample is calculated 28.2 from the SEM micrograph.

PHOTOLUMINESCENCE SPECTROSCOPY
Photoluminescence (PL) spectra of the europium doped tungstrate oxide nanocomposites material were carried out by the spectra fluorometer with a 450W high pressure xenon lamp as an excitation source at room temperature.PL describes the phenomenon of the light emission from the matter after by absorption of photons [13]. It is one of many forms of luminescence and is initialized by photo excitation. Figure shows that the PL emission peak for the europium doped tungstate oxide. The prepared samples were excited at 200nm. For europium doped tungstate oxide the emission peak occurs at 359 nm. The result of the growth sample suggests that it may be used as violet light emitting material. This result is consistent with that observed. The size effect of the surface states have been discussed. By this result it shows that the sample have a presence of photocatytic properties and the value of band gap energy was 3.4 eV. It shown in the figure 4.

Fig 4 Photoluminence pattern of the sample CONCLUSIONS
In the present study, a Europium tungstate nanocomposite is synthesized successfully by hydrothermal method. Europium nitrate and Sodium tungstrate were used as starting materials. The compounds thus prepared have been carried out for different characterization. Average particle size is calculated using XRD techniques. The average particle size was found to be 27.4nm.From FTIR spectra the vibration peaks were obtained at 694cm -1 which represents the WO band. The surface morphology of the sample was analyzed by SEM.SEM analysis indicated major part surface is clear and free from dislocation. However the hydrothermal methods helped the morphological studies. From photoluminescence, the sample showed photo catalytic properties and the emission peak was obtained at 359nm and the band gap energy was found to be 3.4eV. In future the properties can be enhanced by adding other dopants and the photocatalytic properties can be increased. REFERENCE Eco-friendly preparation of zinc oxide nanoparticles using Tabernaemontana divaricata and its photocatalytic and antimicrobial activity,A. Raja,S. Ashokkumar, R. Pavithra Marthandam, J. Jayachandiran, Chandra