"Nanocomposites and nanomaterials"

Properties of ZnMoO4·0.8H2O synthesized by ultrasonic method
Diyuk N.V.1, Zazhigalov V.O.2, Sachuk O.V.2, Diyuk О.А.2, Shcherban N.V.3, Shcherbakov S.M.4, Permyakov V.V.5
1 Taras Shevchenko National University of Kyiv 60 Volodymyrska Street, Kyiv 01033, Ukrain. 
E-mail: nvdiyuk@gmail.com
2 Institute for Sorption and Problems of Endoecology of NAS of Ukraine, General Naumov Street, 13, Kyiv 03164, Ukraine
3 L.V. Pisarzhevsky Institute of Physical Chemistry, National Academy of Sciences of Ukraine,31 pr. Nauky, Kyiv 03028, Ukraine
4 M.G.Kholodny Institute of Botany of the National Academy of Science of Ukraine Tereshchenkivska str., 2 Kyiv 01004, Ukraine
5 Institute of Geological Sciences, National Academy of Sciences of Ukraine, 55-b O.Gonchar Str., 01054 Kyiv, Ukraine
ZnMoO4•0.8H2O has used as anode material for lithium ion batteries. The traditional method of synthesis of ZnMoO4•0.8H2O is based on the interaction of Na2MoO4·2H2O and Zn(NO3)2·6H2O in aqueous solution. 
The sonochemical treatment of cheap and insoluble oxides ZnO and MoO3 with a molar ratio 1:1 in an aqueous medium leads to formation the pure phase of ZnMoO4•0.8H2O. Synthesized samples were characterized by XRD, BET, SEM, TEM, FTIR, TPR-H2 and thermogravimetric analysis (Ar). XRD patterns of samples synthesized by ultrasonic method are well in agreement with phase ZnMoO4•0.8H2O (JCPDS No. 25-1025). No lines of any other phases were detected, which confirms the high purity of the obtained samples. SEM images demonstrate the formation of the ZnMoO4•0.8H2O as a nano-filamentary structure. The width of filament is 100nm and a length is more than 200 m. The interwoven nano-filamentary structures shape a secondary structure in the form of a web. TEM studies showed that nano-filamentary structures consist of thinner needle-like structures having a width of 3-5 nm. Thermogravimetric measurements showed that ZnMoO4•0.8H2O has two forms of crystallized water: first form desorbed up to 150°C, second form desorbed in the temperature range of 150-280°C.
Sonochemical synthesis allows to create a pure and nanostructured ZnMoO4•0.8H2O phase using ZnO and MoO3 as an initial material. The proposed synthesis prevents environmental pollution, since by-products are not formed in the synthesis process in contradistinction to traditional synthesis.