In-Situ XPS Study on Adsorption Reaction of Dimethyl Sulfide on Pd Nanoparticle Surface

Morihara, M.; Miura, Kazuya; Nomoto, T.; Yagi, Shunsuke

doi:10.1380/ejssnt.2009.298

Cited by 6 publications

(4 citation statements)

References 12 publications

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“…The Si substrate is suitable for the estimation of the size of Mg nanoparticle by the AFM observation due to its good flatness. The Ni substrate was used as the conventional substrate for NEXAFS and XPS measurements [11][12][13]. The deposition amount of Mg nanoparticles was controlled by deposition time.…”

Section: Methodsmentioning

confidence: 99%

Size Dependence of Air Oxidation for Mg Nanoparticle

Ogawa

Murakami

Shirai

et al. 2011

e-J. Surf. Sci. Nanotechnol.

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The size dependence of the air oxidation for Mg nanoparticles is studied by Mg K-edge NEXAFS and AFM techniques. In the case of the exposure to the air for 3 days, the degree of the air oxidation for Mg nanoparticles increases with reduction of the size of Mg nanoparticle. However, the opposite size dependence is observed in the case of the exposure to the air for 25 days, i.e. the air oxidation reaction for the smaller Mg nanoparticles is more inhibited in the case of long term exposure to the air. This size dependence is attributed to the occupation of the free spaces between Mg nanoparticles, which protects against the incursion of the air component molecules into the multilayer of Mg nanoparticles.

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Section: Methodsmentioning

confidence: 99%

Size Dependence of Air Oxidation for Mg Nanoparticle

Ogawa

Murakami

Shirai

et al. 2011

e-J. Surf. Sci. Nanotechnol.

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“…We use (CH 3 ) 2 S (dimethyl sulfide; DMS) to study the Sulfur Poisoning because DMS is one of the major odorant gases for the leakage. In our previous studies, we have revealed the adsorption reaction of DMS on the Pd nanoparticle surface, and the adsorption reaction is that DMS dissociates into (CH 3 )S (methane thiolate; MT) and atomic S [5,6]. It is supposed that DMS on the Pd/Mg film makes the dissociation reaction.…”

Section: Introductionmentioning

confidence: 99%

(CH<sub>3</sub>)<sub>2</sub>S Adsorption Behavior on Pd/Mg Thin Film Surface Studied by NEXAFS

Shirai

Tsukada

Kutluk

et al. 2012

e-J. Surf. Sci. Nanotechnol.

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A dissociation reaction of (CH3)2S (dimethyl sulfide; DMS) on a Pd capped Mg layer surface has been studied by using Sulfur K-edge Near Edge X-ray Absorption Fine Structure (NEXAFS) technique. The Pd thin film is prepared by two deposition methods, one is vacuum deposition, and the other is DC magnetron sputtering. The surface morphology is observed by Atomic Force Microscopy (AFM). The AFM observation reveals that there are many nano sized particles on the Pd/Mg surface, and an average size of the particle prepared by DC magnetron sputtering is obviously smaller than that prepared by vacuum deposition. NEXAFS analysis reveals that DMS dissociation is weakened on the Pd surface prepared by DC magnetron sputtering and promoted on the Pd surface prepared by vacuum deposition. It seems that any adsorption reactions are promoted on small sized metal particles, however, the DMS dissociation reaction is promoted on the Pd surface prepared by vacuum deposition, which has big sized Pd particles.

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“…Thus, we have employed gas evaporation method that enabled to fabricate nanoparticles with clean surface in the previous study [7]. In this method, a pure metal is heated and evaporated by using a tungsten basket, and the metal nanoparticles are synthesized under inactive gas environment.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Rh Nanoparticle and Adsorption Reaction with DMS Studied by NEXAFS and XPS

Niwa

Ogawa

Nakanishi

et al. 2011

JSA

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We have studied the adsorption reaction of DMS on the Rh nanoparticle fabricated by the gas evaporation method by using AFM, XPS and NEXAFS techniques. The AFM result shows that we can fabricate the Rh nanoparticle which has a small diameter with a small distribution and high dispersion of it by the gas evaporation method with the Rh wire as an evaporation source. The Rh L 3 -edge NEXAFS spectra indicate that the surface and bulk of Rh nanoparticle is stable in the chemical state of Rh 0 despite the exposure to air.The Rh 3d XPS and S K-edge NEXAFS results show the lower degree of oxidized Rh nanoparticle has the stronger bonding with atomic S than the more oxidized one.

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In-Situ XPS Study on Adsorption Reaction of Dimethyl Sulfide on Pd Nanoparticle Surface

Cited by 6 publications

References 12 publications

Size Dependence of Air Oxidation for Mg Nanoparticle

Size Dependence of Air Oxidation for Mg Nanoparticle

(CH<sub>3</sub>)<sub>2</sub>S Adsorption Behavior on Pd/Mg Thin Film Surface Studied by NEXAFS

Fabrication of Rh Nanoparticle and Adsorption Reaction with DMS Studied by NEXAFS and XPS

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