Preparation and characterization of highly crystallized BaTiO₃layer on Ni nanoparticles

Abstract

A uniform polycrystalline BaTiO 3 layer is coated on Ni nanoparticles by an economic and effective one-step sol-precipitation method for future applications in next-generation multilayer ceramic capacitors. Using NaOH to provide strong alkaline conditions, a highly crystallized BaTiO 3 layer is obtained with high efficiency. The influence of the BaTiO 3 coating amount on the properties of Ni powders is examined. Transmission electron microscopy and energy-dispersive spectroscopy show that the BaTiO 3 layer is continuous and uniform. X-ray photoelectron spectra of the Ba, O states show that a strong bonding was formed between the coating layer and the Ni surfaces. Through this bonding, BaTiO 3 can heterogeneously nucleate and crystallize on the Ni surfaces. This polycrystalline BaTiO 3 layer is very effective in protecting Ni from oxidation as well as increasing the shrinkage onset temperature of Ni nanoparticles. Moreover, these properties can be further improved by increasing the BaTiO 3 coating amount.

Recent advances in subphthalocyanines and related subporphyrinoids

“…Among them, Bathocuproine (BCP) represent the most studied and efficient EBM in 20 /C 60 devices. 345,346 In the case of SubPcs, rather than employing pristine BCP, the dilution of BCP with C 60 has been found to further improve the device performance and lifetime. 347 Several other exciton blockings, such as N , N -dicarbazolyl-3,5-benzene, 348 buffer layer of bis-(naphthylphenylaminophenyl)fumaronitrile 349 or bis-(di(2-fluorophenyl)aminospiro)-fumaronitrile, 350 have also proven to be effective by showing remarkable PCEs as high as 5.08, 4.77 or 5.13%, respectively.…”

Exchange bias mediated self-biased magnetoelectric coupling in Co–BaTiO3 composites

“…32 Hence, it is reasonable to assume that Co–BTO ME composites can form an interfacial cobalt oxide layer by attaching the O 2− and OH − groups on the surface of oxygen. 23,37 In short, there is chance for the presence of oxidation states like Co 0 , Co 2+ , Co 3+ and Co 4+ in Co–BTO composites. This means that there is finite possibility for the surface oxidation of cobalt to CoO, Co 3 O 4 , CoO 2 , Co 2 O 3 , or Co 2 O 4 .…”

Coating of Crystalline BaTiO3 Layer on Ni Nanoparticles for Multilayer Ceramic Capacitor Electrode

“…Multilayer ceramic capacitor (MLCC) is a basic passive component that is widely used in electric and electronic devices . It is fabricated by sintering the alternately stacked dielectric and electrode layer at a high temperature . With the miniaturization of modern electronic devices, it is too expensive to prepare Pd/Ag nanopowders for the electrode.…”