Structure Transition of CuOX Nanoparticles in Copper−Silica Nanocomposites
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- 作者：Qingjie Yu ; Xuehu Ma ; Zhong Lan ; Mingzhe Wang ; Chunjian Yu
- 刊名：Journal of Physical Chemistry C
- 出版年：2009
- 出版时间：April 30, 2009
- 年：2009
- 卷：113
- 期：17
- 页码：6969-6975
- 全文大小：308K
- 年卷期：v.113,no.17(April 30, 2009)
- ISSN：1932-7455
文摘
Two series of CuOX/SiO2 nanocomposites with various Cu/Si molar ratios have been synthesized by sol−gel technique from two different copper metal precursors, cupric nitrate hydrate (Cu(NO3)2·3H2O) and cupric acetylacetonate (Cu(acac)2), respectively. The influence of various chemical precursors and Cu content on the morphological evolution of CuOX nanoparticles in CuOX/SiO2 nanocomposites has been characterized by XRD, TEM, TG, FTIR, and XPS. For the first time, we demonstrated that, with the increase of Cu content, CuOX nanoparticles in CuOX/SiO2 nanocomposites performed two different morphology transitions, that is, from nanospherical aggregates to uniform nanorods using Cu(NO3)2·3H2O as chemical precursor and to squarelike frames starting from Cu(acac)2. The effects of reducing agents on these different morphology transformations of CuOX nanoparticles between the SCuN and SCuC series were also discussed.