New High-Temperature Pb-Catalyzed Synthesis of Inorganic Nanotubes

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• 作者：Olga Brontvein ; Daniel G. Stroppa ; Ronit Popovitz-Biro ; Ana Albu-Yaron ; Moshe Levy ; Daniel Feuerman ; Lothar Houben ; Reshef Tenne ; Jeffrey M. Gordon
• 刊名：The Journal of the American Chemical Society
• 出版年：2012
• 出版时间：October 3, 2012
• 年：2012
• 卷：134
• 期：39
• 页码：16379-16386
• 全文大小：613K
• 年卷期：v.134,no.39(October 3, 2012)
• ISSN：1520-5126

文摘

A new procedure for the synthesis of MoS₂ nanotubes is reported, and additionally demonstrated for MoSe₂, WS₂, and WSe₂. Highly concentrated sunlight creates continuous high temperatures, strong temperature gradients, and extended hot annealing regions, which, together with a metallic (Pb) catalyst, are conducive to the formation of different inorganic nanotubes. Structural characterization (including atomic resolution images) reveals a three-step reaction mechanism. In the first step, MoS₂ platelets react with water鈥揳ir residues, decompose by intense solar irradiation, and are converted to molybdenum oxide. Subsequently, the hot annealing environment leads to the growth of Pb-stabilized MoO_3鈥?i>x nanowhiskers. Shortly afterward, the surface of the MoO_3鈥?i>x starts to react with the sulfur vapor supplied by the decomposition of nearby MoS₂ platelets and becomes enveloped by MoS₂ layers. Finally, the molybdenum oxide core is gradually transformed into MoS₂ nanotubes. These findings augur well for similar syntheses of as yet unattained nanotubes from other metal chalcogenides.