Microstructure Characterization, Chemical Stability, and Electrical Property of Ceramics Nanopowders Synthesized by Atmospheric Pressure Plasma Jet

• Main Authors: Yu-Ming Su, 蘇昱銘
• Other Authors: Yu-Lin Kuo
• Format: Others
• Language: en_US
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/98540866534566857091

博士 === 國立臺灣科技大學 === 機械工程系 === 102 === Gd2O3-doped CeO2 (GDC) nanoparticles were prepared thought a facile one-step fabrication from a precursor solution via atmospheric pressure plasma jet (APPJ). The mixture precursor solution of gadolinium nitrate hexahydrate and cerous nitrate hexahydrate were used as initial precursors for Gd and Ce ions. The microstructure of GDC was found to be an assembly of nanocrystallites with a cubic fluorite structure analyzed by XRD and TEM. Reactive oxygen species (detected by optical mission spectroscopy (OES)) are believed to be the major oxidative agents for the formation of oxide materials in the APPJ process. Based on the materials characterization and OES observations, the proposed formation mechanism of GDC nanoparticles by APPJ was illustrated in this study. The results of the study effectively demonstrated the feasibility of preparing well-crystallized GDC nanoparticles by the APPJ system. Theoretical and experimental studies based on trivalent metal ions doped-ceria have received major attention due to its possible applications as the electrolyte material within solid oxide fuel cells (SOFCs). First principles density functional theory (DFT) study of ceria-based materials can provide a detailed understanding of the atomic level properties and contribute towards the hunt for improved electrolyte material. A better understanding of this interaction will facilitate the design of better conjugates for Ce0.9Gd0.1O2 nanocrystals for various applications. The detailed mechanism is not clear until now. In this study, the density function theory (DFT) simulation was employed to demonstrate charge analyses of CeO2 and Ce0.9Gd0.1O2. By comparing the Bader charge of the bare CeO2 and Ce0.9Gd0.1O2 nanocrystals, it was shown that Gd as doped metal help to increase the charge on Ce0.9Gd0.1O2 nanocrystals.