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      저자 : Siriprapha Jattukul (검색결과 1 건)
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        Hydroxyethyl cellulose-assisted hydrothermal synthesis of Bi2S3 urchin-like colonies

        Titipun Thongtem,Siriprapha Jattukul,Chalermchai Pilapong,Somchai Thongtem 한국물리학회 2012 Current Applied Physics Vol.12 No.1

        Orthorhombic Bi2S3 with different morphologies was successfully synthesized by the acid-catalyst hydrothermal reactions of bismuth nitrate (Bi(NO3)3) and thiourea (NH2CSNH2) solutions containing different amounts of hydroxyethyl cellulose (HEC). Phase, morphologies, and optical properties were characterized by X-ray diffraction, selected area electron diffraction, scanning and transmission electron microscopy, and ultravioletevisible spectroscopy. The products, hydrothermally synthesized in the HECfree,0.25 g HEC-added, 0.5 g HEC-added and 1.00 g HEC-added solutions, were respectively proved to be orthorhombic Bi2S3 irregular nanorods, complete urchin-like colonies of regular nanorods, incomplete urchin-like colonies of regular nanorods, and highly crystalline regular nanorods growing along the [001]direction. Tauc band gaps of the orthorhombic Bi2S3 nanorods, synthesized in the HEC-free, 0.25 g HECadded,and 1.00 g HEC-added solutions were determined to be 3.0, 1.75 and 1.8 eV, respectively. Formation mechanism of orthorhombic Bi2S3 nanorods, synthesized in the HEC-free and HEC-added solutions, was also discussed at great detail. Orthorhombic Bi2S3 with different morphologies was successfully synthesized by the acid-catalyst hydrothermal reactions of bismuth nitrate (Bi(NO3)3) and thiourea (NH2CSNH2) solutions containing different amounts of hydroxyethyl cellulose (HEC). Phase, morphologies, and optical properties were characterized by X-ray diffraction, selected area electron diffraction, scanning and transmission electron microscopy, and ultravioletevisible spectroscopy. The products, hydrothermally synthesized in the HECfree,0.25 g HEC-added, 0.5 g HEC-added and 1.00 g HEC-added solutions, were respectively proved to be orthorhombic Bi2S3 irregular nanorods, complete urchin-like colonies of regular nanorods, incomplete urchin-like colonies of regular nanorods, and highly crystalline regular nanorods growing along the [001]direction. Tauc band gaps of the orthorhombic Bi2S3 nanorods, synthesized in the HEC-free, 0.25 g HECadded,and 1.00 g HEC-added solutions were determined to be 3.0, 1.75 and 1.8 eV, respectively. Formation mechanism of orthorhombic Bi2S3 nanorods, synthesized in the HEC-free and HEC-added solutions, was also discussed at great detail.

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