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论文类型：期刊论文

发表时间：2012-01-16

发表刊物：MATERIALS CHEMISTRY AND PHYSICS

收录刊物：SCIE、EI、Scopus

卷号：132

期号：1

页面范围：96-103

ISSN号：0254-0584

关键字：Chemical synthesis; Nanostructures; Non-crystalline materials; Oxidation

摘要：Nickel phosphate nanotubes (NiPO-NTs) were obtained via a simple urea-assisted hydrothermal route in the absence of organic surfactant as the structure-directing agent. The material possessed an urchin-shaped structure, and the one dimensional nanotubes were directed outward around the spheres. SEM and TEM observations indicated that the NiPO-NTs had an outer diameter of about 7.0 nm, inner diameter of 4.0 nm, and length of around 0.75 mu m. It is found that the formation of NiPO-NTs was determined by the pH value and its changing rate, which were controlled by urea hydrolysis. Accordingly, a possible mechanism of nanotube formation was proposed. The synthesized NiPO-NTs showed high catalytic performance in the epoxidation of cyclohexene. (C) 2011 Elsevier B.V. All rights reserved.