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The structural and electrical properties of mesoporous La 0.7 Sr 0.3 MnO 3 (LSMO) films for electrode applications were investigated as a function of annealing temperature. Mesoporous LSMO films were successfully synthesized by using solgel and evaporationinduced self-assembly processes. Metal acetates and Brij-S10 were used as the starting material and pore structure-forming template, respectively. With the adoption of mesoporous structure in the LSMO film, the surface area of mesoporous LSMO films was increased up to 165% with an annealing temperature increase from 350 to 650°C. The electrical conductivity value of mesoporous LSMO was determined to be 46 S/cm at a measurement temperature of 500°C. This greatly increased the surface area and provided reasonable electrical conductivity, which makes mesoporous LSMO films suitable as electrode materials of micro-solid oxide fuel cell devices.

Nowadays a lot of studies were conducted to improve electronic properties of ZnO for transparent conducting oxide materials using single-wall carbon nanotube (SWCNT). In this study, ZnO nanocomposite films containing 0.1 wt % of SWCNTs were synthesized using a solgel method. Variation in ball-milling time of SWCNTs up to 12 h was introduced to induce a difference in the distribution size and length of SWCNTs. The ball-milling effect was analyzed with scanning electron microscopic studies and electrical property measurement of SWCNTs-incorporated ZnO nanocomposite films. Dispersion and shortening of SWCNTs were observed with increasing ball-milling time: dispersion was saturated but shortening was proceeded. 9 h of ball-milling time was found to optimize dispersion and shortening of SWCNTs, confirmed from the electrical property measurement. With optimized ball-milling time of 9 h, a transmittance in the visible light range of SWCNTs-incorporated ZnO film maintained over 87% of transparency. Also the resistivity of this film (0.53 ³ cm) was less than that (1.48 ³ cm) of SWCNTs-incorporating ZnO without a ball-milling.