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In situ analysis of catalytically active Pd surfaces for CO oxidation with near ambient pressure XPS
Kondoh, H.,Toyoshima, R.,Monya, Y.,Yoshida, M.,Mase, K.,Amemiya, K.,Mun, B.S. Elsevier Science Publishers 2016 CATALYSIS TODAY - Vol.260 No.-
<P>X-ray photoelectron spectroscopy (XPS) is useful for in situ analysis of catalytically active surfaces under reaction conditions. We conducted in situ observations of CO oxidation on Pd single-crystal surfaces with different orientations under near ambient pressure (NAP) conditions with XPS. In this short review we compare catalytically active surfaces of Pd with the different orientations. Both surface oxides and atomic oxygen chemisorbed on metallic surfaces can be active for CO oxidation depending on surface geometric structure. We propose similarity between the surface oxides and the chemisorbed oxygen from a viewpoint of availability of active oxygen. Catalytic activity of the metallic surface under NAP condition is also compared with that under ultrahigh vacuum conditions. (C) 2015 Elsevier B.V. All rights reserved.</P>
Surface segregation and oxidation of Pt<sub>3</sub>Ni(111) alloys under oxygen environment
Lee, H.C.,Kim, B.M.,Jeong, C.K.,Toyoshima, R.,Kondoh, H.,Shimada, T.,Mase, K.,Mao, B.,Liu, Z.,Lee, H.,Huang, C.Q.,Li, W.X.,Ross, P.N.,Mun, B.S. Elsevier Science Publishers 2016 CATALYSIS TODAY - Vol.260 No.-
<P>Utilizing ambient pressure X-ray photoelectron spectroscopy (AP-XPS), the surface segregation and oxidation of Pt3Ni(1 1 1) alloys are investigated as a function of temperature and oxygen pressure. The in situ AP-XPS measurements of oxygen oxidation process show that the Pt 'skin' surface is not stable under the exposure of oxygen pressure of 100 mTorr at room temperature. As the temperature and pressure are elevated, the formations of Ni2O3, NiOx, and NiO are observed on surface while Pt atom starts to reduce its adsorbed oxygen, which is a clear sign of surface segregation of Ni to surface. Upon the evacuation of oxygen gas, i.e. ultrahigh vacuum condition, both of NiOx and NiO oxide get reduced and Ni2O3 remains on the surface. The DFT calculation is employed to explain the formation of surface oxides under oxidation condition. (C) 2015 Elsevier B.V. All rights reserved.</P>
Measurement of Micro-Elasticity within a Fertilized Egg by Using Brillouin Scattering Spectroscopy
Yoshihiko Fujimura,H. Kondoh,M. Inoue,S. Kinoshita 한국물리학회 2007 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.51 No.2I
We have measured the internal elasticity of a zebrafish egg during cleavage by using Brillouin scattering spectroscopy. We have found that the elasticity in the embryo is rather constant in spite of the large morphological change. The result suggests that the functional change in F-actin network at the surface also controls the cytokinesis inside the cell.
In-situ surface analysis of AuPd(110) under elevated pressure of CO
Languille, M.A.,Ehret, E.,Lee, H.C.,Jeong, C.K.,Toyoshima, R.,Kondoh, H.,Mase, K.,Jugnet, Y.,Bertolini, J.C.,Aires, F.J.C.S.,Mun, B.S. Elsevier Science Publishers 2016 CATALYSIS TODAY - Vol.260 No.-
<P>With the combination of various in-situ surface science tools, surface chemical and structural properties of bimetallic AuPd(1 1 0) alloys are characterized under elevated CO pressure. Under 1 Torr of CO gas pressure, STM images show the formation of nano-sized surface rice-grains along the index direction of [1-10] while PM-IRRAS shows new CO vibrational band. This new vibrational band of PM-IRRAS is confirmed as the CO molecules attached to atop site of Pd with the results of ambient pressure XPS. In the case of adsorption of CO on AuPd(1 1 0) alloys, the so-called 'pressure gap' exists and the surface morphology and its chemical states change at elevated pressure conditions. (C) 2015 Elsevier B.V. All rights reserved.</P>
Toyoshima, R.,Hiramatsu, N.,Yoshida, M.,Amemiya, K.,Mase, K.,Mun, B.,Kondoh, H. Royal Society of Chemistry 2017 Chemical communications Vol.53 No.94
<P>Catalytic CO oxidation over Pd(111) and Pd70Au30(111) surfaces was investigated by in situ spectroscopic observations to understand the alloying effect. The reaction behaviour on Pd70Au30(111) is greatly different from that on Pd(111). Pd monomer and dimer ensembles can act as active centers, whereas triangular-shaped trimers and larger ensembles are inactive.</P>