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Pootawang, Panuphong,Saito, Nagahiro,Takai, Osamu,Lee, Sang-Yul IOP Pub 2012 Nanotechnology Vol.23 No.39
<P>Arc discharge in solution, generated by applying a high voltage of unipolar pulsed dc to electrodes of Ag and Pt, was used as a method to form Ag/Pt bimetallic nanocomposites via electrode erosion by the effects of the electric arc at the cathode (Ag rod) and the sputtering at the anode (Pt rod). Ag/Pt bimetallic nanocomposites were formed as colloidal particles dispersed in solution via the reduction of hydrogen radicals generated during discharge without the addition of chemical precursor or reducing agent. At a discharge time of 30 s, the fine bimetallic nanoparticles with a mean particle size of approximately 5 nm were observed by transmission electron microscopy (TEM). With increasing discharge time, the bimetallic nanoparticle size tended to increase by forming an agglomeration. The presence of the relatively small amount of Pt dispersed in the Ag matrix could be observed by the analytical mapping mode of energy-dispersive x-ray spectroscopy and high-resolution TEM. This demonstrated that the synthesized particle was in the form of a nanocomposite. No contamination of other chemical substances was detected by x-ray photoelectron spectroscopy. Hence, solution plasma could be a clean and simple process to effectively synthesize Ag/Pt bimetallic nanocomposites and it is expected to be widely applicable in the preparation of several types of nanoparticle. </P>
Gasidit Panomsuwan,Nagahiro Saito,Osamu Takai 한국표면공학회 2010 한국표면공학회 학술발표회 초록집 Vol.2010 No.11
SrTiO₃ films have been grown by an ion beam deposition on LaAlO₃ substrate at different growth temperatures and oxygen partial pressures. The influences of these growth parameters on crystal structure and surface morphology were investigated by XRD and AFM, respectively. XRD results show that STO films exhibit a single perovskite phase with high (h00) orientation and epitaxial relationship was found to be STO (100) // LAO (100) and STO [100] // LAO [100]. Two-dimensional growth mechanism (step-flow growth mode) with small RMS roughness of ~0.1 nm can be observed at high growth temperature and optimum oxygen partial pressure as investigated by AFM images. Cross-sectional TEM observation was also carried out in order to investigate the interfacial structure.