Papers by Keyword: Metal Oxidation

Abstract: The paper is dedicated to nickel nanoparticles dissolution in simulated body fluids. By the example of industrial electroexplosive nickel nanopowder it has been demonstrated that dissolution degree in simulated lung fluid and simulated saliva can reach 98.0 and 62.8 wt.% for 24 hours, respectively. The mechanism of nickel dissolution has been proposed. It includes the dissolution of energy saturated oxide film, formed in oxygen saturated simulated saliva, the formation of nickel hydroxycitrate in simulated lung fluid as well.

Abstract: Two alternative plasma strip processes were developed to meet the photoresist (PR) removal requirements of future technology nodes. Compared to traditional oxidizing chemistries, the new plasma strip approaches showed significantly lower silicon oxidation and substrate loss, while achieving good residue removal capabilities. Plasma strip-induced dopant loss and profile changes were also evaluated for gate-first and gate-last high-k/metal gate applications.

Abstract: The formation mechanisms of hollow metal oxide through the oxidation of several metal nanoparticles have been studied by transmission electron microscopy. For Zn, Al, Cu, Ni and Fe nanoparticles, hollow oxide nanoparticles were obtained as a result of vacancy aggregation in the oxidation processes. The formation of the hollow morphology is attributed to the faster outward diffusion of metal ions through the oxide layer in the oxidation processes. Further changes in morphology during the annealing of hollow Cu, Ni and Fe oxides at higher temperatures in air were examined.

Abstract: The formation of hollow metal oxide nanoparticles through oxidation process has been studied by transmission electron microscopy for Cu, Zn, Al, Pb and Ni in order to clarify the detailed formation mechanism of hollow oxide nanoparticles and their governing factors. For Cu, Zn, Al and Ni nanoparticles, hollow oxide nanoparticles are obtained as a result of vacancy aggregation in the oxidation processes. These results arise from faster outward diffusion of metal ions through the oxide layer in the oxidation processes. On the other hand, Pb nanoparticles turn to solid PbO, because the diffusivity difference DPb < DO in PbO leads to no formation of vacancy clusters.