Preparation of hollandite-type KxGaxSn8−xO16 thin film and NO adsorption behavior

Fujimoto, Kenjiro; Suzuki, Jun; Harada, Masaru; Awatsu, Satoshi; Mori, Toshiyuki; Watanabe, Mamoru

doi:10.1016/s0167-2738(02)00324-7

Cited by 14 publications

(2 citation statements)

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“…After discovering the catalytic property, Fujimoto et al predicted that the active point of NO gas adsorption was alkaline metal ions located at the end of the one-dimensional tunnels. 5) Recently, we also demonstrated the NO adsorption for lepidocrocite-type oxides which had layered structure with including alkaline metals in an interlayer. And, it was found that NO adsorption mechanism also corresponded exactly with a hollandite-type oxide.…”

Section: Introductionmentioning

confidence: 94%

In-situ observation of nitrogen monoxide adsorption on perovskite-type MTiO3 (M = Sr, Ba)

Fujimoto

Ishiduka

Yamaguchi

2016

J. Ceram. Soc. Japan

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Strontium titanate (SrTiO 3 ; STO) and barium titanate (BaTiO 3 ; BTO) powders were prepared using the solid-state reaction method. To study the tendency for nitrogen monoxide (NO) to adsorb on STO and BTO surfaces, we observed the morphology of the powders, calculated the specific surface areas, and made adsorption/desorption observations using scanning electron microscopy (SEM), nitrogen gas adsorption/desorption isotherms under 77 K, temperature programmed desorption (TPD), and diffuse reflectance fourier transformed spectroscopy (DRIFTs). The average STO and BTO powder particle size was 0.2¯m. The specific surface areas of the non-porous STO and BTO powders were 3 and 4 m 2 g ¹1 , respectively. TPD and DRIFTs measurements revealed the NO adsorption properties of the STO and BTO powders in the presence of oxygen gas. Additionally, it was considered that the adsorbed NO was formed as nitrates [M(NO 3 ) 2 , M = Sr, Ba] on surface of each powder.

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Section: Introductionmentioning

confidence: 94%

In-situ observation of nitrogen monoxide adsorption on perovskite-type MTiO3 (M = Sr, Ba)

Fujimoto

Ishiduka

Yamaguchi

2016

J. Ceram. Soc. Japan

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“…The hollandite compounds are represented by the general chemical formula A x M y N 82y O 16 ðx , 3; y , 3Þ; where A ¼ alkali or alkaline earth ions, M ¼ di-or trivalent cations, and N ¼ tetravalent cations [1]. The hollandite structure consists of a framework of edge-and cornersharing octahedra forming tunnels of a square cross section along the c-axis.…”

Section: Introductionmentioning

confidence: 99%

Photoluminescence properties of a hollandite compound K₂Ga₂Sn₆O₁₆

Nakajima

Mori

Awatsu³

et al. 2003

Science and Technology of Advanced Materials

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A hollandite compound K 2 Ga 2 Sn 6 O 16 (KGSO) has photocatalytic activity, although little is known about the optical properties of the compound. To design a higher quality photocatalyst, studies on its optical properties are required. In this study, a KGSO powder and a SnO 2 (rutile structure) powder were prepared by the sol-gel method. Photoluminescence (PL) and PL excitation spectra of the two powders were measured. To our knowledge, this is the first report of PL from a hollandite compound. It was found that the band gap energy of the KGSO powder is 3.6 eV, the value of which is identical with that of the band gap energy of SnO 2 . This was confirmed by the result of the photoacoustic spectrum of the KGSO. The shapes of the PL excitation spectra of the two powders agreed. Moreover, the PL spectra of the two powders have one broad band around 600 nm. From these results, one can conclude that the mechanism of PL of KGSO is the same as that of SnO 2 . In air with ethanol, however, the time-course of the KGSO powder was different from that of the SnO 2 powder. By adding ethanol vapor in air, the PL intensity of the SnO 2 powder increased, whereas the PL intensity of the KGSO powder remained unchanged. By comparing the PL time-courses of the two powders with those of a commercial rutile TiO 2 powder, it was concluded that the photodesorption of O 2 in air with ethanol occurs on the SnO 2 powder, not on the KGSO powder. This was supported by the results of the inorganic carbon concentrations on the two powders. These results indicate that the behavior of O 2 on the KGSO surface during a photocatalytic oxidation is different from that on the SnO 2 surface during the oxidation. q

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Crystal structure and thermodynamic properties of dipotassium diiron(III) hexatitanium oxide

Knyazev

Черноруков

Letyanina

et al. 2012

J Therm Anal Calorim

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Preparation of hollandite-type KxGaxSn8−xO16 thin film and NO adsorption behavior

Cited by 14 publications

References 10 publications

In-situ observation of nitrogen monoxide adsorption on perovskite-type <i>M</i>TiO<sub>3</sub> (<i>M</i> = Sr, Ba)

In-situ observation of nitrogen monoxide adsorption on perovskite-type <i>M</i>TiO<sub>3</sub> (<i>M</i> = Sr, Ba)

Photoluminescence properties of a hollandite compound K₂Ga₂Sn₆O₁₆

Crystal structure and thermodynamic properties of dipotassium diiron(III) hexatitanium oxide

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Preparation of hollandite-type KxGaxSn8−xO16 thin film and NO adsorption behavior

Cited by 14 publications

References 10 publications

In-situ observation of nitrogen monoxide adsorption on perovskite-type <i>M</i>TiO<sub>3</sub> (<i>M</i> = Sr, Ba)

In-situ observation of nitrogen monoxide adsorption on perovskite-type <i>M</i>TiO<sub>3</sub> (<i>M</i> = Sr, Ba)

Photoluminescence properties of a hollandite compound K2Ga2Sn6O16

Crystal structure and thermodynamic properties of dipotassium diiron(III) hexatitanium oxide

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Photoluminescence properties of a hollandite compound K₂Ga₂Sn₆O₁₆