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Bulk ZnO nanorod assemblies fabricated by spin coating of organo-precursor gels on CuO nanowires

Uma K., Anathakumar S., Mangalaraja R. V., Soga T., Jimbo T.

Materials Science Poland

2013

Vol. 31, No. 3

397--403

Bulk ZnO nanorod assemblies have been successfully fabricated on CuO nanowires through spin coating of organoprecursor gels. A thin film of CuO nanowires was first generated by direct heating of a metallic Cu-foil at 500 A degrees C in an air atmosphere. A stable colloidal organo-precursor sol synthesized by dissolving equimolar zinc acetate dihydrate and monoethanolamine in 2-methoxyethanol was subsequently repeatedly deposited onto the CuO nanowires by spin coating. The formation of ZnO nanorod assemblies was controlled by varying the number of coatings. The average diameter of the ZnO rods was determined to be similar to 600 nm.

Microwave-flash combustion synthesis of yttria nanopowders

Mangalaraja R. V., Ramam K. V. S., Ravi J., Camurri C. P.

Materials Science Poland

2007

Vol. 25, No. 4

1075--1080

Single phase yttria nanopowders for transparent ceramics were successfully prepared by using a novel approach called microwave-flash combustion technique. This technique involves the reaction of yttrium nitrate and urea in microwave oven for few minutes. The as-prepared precursor powder was later calcined at 1100 st.C for 4h to form cubic crystalline yttria nanopowders. The as-prepared and calcined powders were analysed by such methods as thermogravimetry, Brunauer-Emmett-Teller surface area measurement, X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The results confirmed that the yttria powder synthesized by microwave-flash combustion was homogeneous and the particles size was in the range of 50-120 nm for calcined powders.