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Regularly faceted copper (Cu) particles ranging from tens of nanometers to submicron were obtained by annealing Cu-Zr films on polyimide and single Si (100) substrates. XRD, TEM, SEM and EDS were used to characterize their microstructural properties. The results show that these particles are pure Cu element and single crystals with [111] preferred orientation. Systematical analysis demonstrates that...
Paper reports morphological and humidity sensing application of Cu2O doped ZnO composite prepared by solid state reaction. Pellet samples of ZnO-Cu2O nanocrystalline powders with 5, 10, 15 and 20 weight % of Cu2O in ZnO have been prepared. These pellets have been annealed at temperatures 200-500??C. When samples have been exposed to humidity, it has been observed that as relative humidity increases,...
In this paper, the microstructure, phase structure and electric properties of the ZnO varistors after annealing at different temperature were researched. The varistors were prepared by the ordinary sintering process using the raw powders crushed and mixed in a high-energy ball milling. From the results of SEM and XRD, it was found that the thickness of the grain boundary was broadened with the increase...
Superparamagnetic Ni0.5Zn0.5Fe2O4 nanonoparticle is fabricated by a sol-gel method. The magnetic and structural properties as a function of annealing temperature were characterized by using X-ray diffactometry (XRD), Mossbauer spectroscopy, and vibrating sample magnetometry (VSM) as well as scanning electron microscope (SEM). Ni0.5Zn0.5Fe2O4 powder that was annealed at 573 K has spinel structure and...
Wideband gap semiconductor GaN has received increasing attention for its potential for wide variety of high-power, high- performance switching and high-frequency devices application. In this paper the simultaneous annealing effect at a temperature of 400degC ~700degC in N2 ambient for 12 min on aluminum (1500 Adeg) as an ohmic contact while Pt/Ti (700 Adeg/700 Adeg) bilayer as a Schottky contact on...
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