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우태균,박일송,설경원,Woo, Tae-Gyu,Park, Il-Song,Seol, Kyeong-Won 한국재료학회 2007 한국재료학회지 Vol.17 No.1
Recently, requirement for the ultra thin copper foil increases with smaller and miniaturized electronic components. In this study, we evaluated the surface morphology, crystal phase ana surface roughness of the copper film electrodeposited by pulse method without using additives. Homogeneous and dense copper crystals were formed on the titanium substrate, and the optimum condition was 25% duty cycle. Moreover, the surface roughness(Ra), $0.295{\mu}m$, is the smallest value in this condition. It is thought that this copper foil is good for electromigration inhibition due to the preferential crystal growth of Cu (111)
차병준,우태균,박은지,김일희,안정은,서현욱,김영독 한국물리학회 2017 Current Applied Physics Vol.17 No.11
We applied hydrophilic surface modification to P-25 TiO2 nanoparticles via thermal deposition of polydimethylsiloxane (PDMS), followed by annealing at 800 C under vacuum conditions. This process yielded a thin layer consisting of hydrophilic organic functional groups (e.g., -C¼O) as well as SiOx structures on the surface of TiO2. Compared to bare TiO2, the surface-modified TiO2 showed a higher adsorption capacity and photo-catalytic decomposition rate toward methylene blue. However, regarding the photo-catalytic decomposition of phenol, total mineralization of phenol was more complete when bare TiO2 was used as a photo-catalyst, whereas partial oxidation of phenol (i.e., into hydroquinone) was more dominant and total oxidation of phenol was supressed in the presence of surface-modified TiO2. Overall, one cannot simply say that hydrophilic modification of TiO2 leads to a higher affinity to H2O molecules with a higher yield of strongly-oxidizing agents (OH radicals) to increase the photo-catalytic activity in aqueous solutions. Our results imply that a subtle balance of the adsorption energy or rates of H2O, reactants, and reaction intermediates can be important factors for determining the photo-catalytic reaction rate. Different types of photo-catalyst surface modification can be beneficial or detrimental depending on the reaction. It is highlighted that one should be wary of evaluating the overall photocatalytic activities of dissimilar catalysts based on the results of only a couple of reactions.