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RISS 인기검색어
- 검색키워드
- 저자 : Abdolali Alemi (검색결과 2 건)
- 무료
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Alemi, Abdolali,Hanifehpour, Younes,Joo, Sang Woo Hindawi Limited 2011 Journal of nanomaterials Vol.2011 No.-
<P>Based on the complex decomposition approach, a simple hydrothermal method has been developed for the synthesizing of Sb2S3nanorods with high yield in 24 h at<SUP>150∘</SUP>C. The powder X-ray diffraction pattern shows the Sb2S3crystals belong to the orthorhombic phase with calculated lattice parametersa=1.120 nm,b=1.128 nm, andc=0.383 nm. The quantification of energy dispersive X-ray spectrometric analysis peaks give an atomic ratio of 2 : 3 for Sb : S. TEM and SEM studies reveal that the appearance of the as-prepared Sb2S3is rod-like which is composed of nanorods with the typical width of 30–160 nm and length of up to 6 μm. High-resolution transmission electron microscopic (HRTEM) studies reveal that the Sb2S3is oriented in the [10-1] growth direction. The band gap calculated from the absorption spectra is found to be 3.29 ev, indicating a considerable blue shift relative to the bulk. The formation mechanism of Sb2S3nanostructures is proposed.</P>
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Abdolali Alemi,Leila Kafi-Ahmadi,Ali Akbar Khandar,Amin Salem 한양대학교 세라믹연구소 2011 Journal of Ceramic Processing Research Vol.12 No.6
Glass in the system 5In2O3.94Na2B4O7 was fabricated via a melt quenching technique. The amorphous nature of the quenched glass was confirmed by X-ray powder diffraction. The infrared spectrum shows no boroxol ring formation in the structure of this glass. Differential thermal analysis shows a glass transition temperature of 696 oC and a crystallization temperature of 1151 oC. A cerium–zirconium mixed oxide Ce0.75Zr0.25O2 and Eu-doped cerium-zirconium mixed oxide were obtained by a solid-state method. Then the glass powder and Eu-doped cerium-zirconium mixed oxide were mixed. The mixture was heated in a crucible. The glass-ceramic sample was obtained by pouring the melts onto stainless steel plates. The samples obtained were annealed at 450 oC for 1 h to remove the thermal strain. Gas phase catalytic oxidation of toluene was studied over these nanostructures. The results showed that the catalytic activity of Eu0.01Ce0.74Zr0.25O1.995 was higher than Ce0.75Zr0.25O2 for conversion of toluene. Differential thermal analysis for a glass-ceramic sample shows a glass transition temperature of 648 oC and a crystallization temperature of 1134 oC. A scanning electron microscopy study of the glass-ceramic indicates that the crystallized glass consists of crystals with an average diameter of about 86 nm dispersed in glassy regions.
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