Synthesis and Optical Properties of Co-Doped ZnO Submicrometer Tubes from Electrospun Fiber Templates
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- 作者：Frederick Ochanda ; Kevin Cho ; Dickson Andala ; Thomas C. Keane ; Ari Atkinson ; Wayne E. Jones ; Jr.
- 刊名：Langmuir
- 出版年：2009
- 出版时间：July 7, 2009
- 年：2009
- 卷：25
- 期：13
- 页码：7547-7552
- 全文大小：820K
- 年卷期：v.25,no.13(July 7, 2009)
- ISSN：1520-5827
文摘
Submicrometer ZnO tubes have been synthesized by a polymer based template approach using sol−gel deposition. Zinc acetate, a precursor to ZnO, was deposited on catalytically active electrospun polycarbonate fibers 250 ± 100 nm in diameter. Thermal degradation of the core fibers resulted in the oxidation of zinc acetate to produce ZnO nanotubes with diameters of 500 ± 100 nm and an average wall thickness of 100 ± 50 nm. Scanning electron microscopy (SEM), Energy dispersive spectroscopy, themogravimetric analysis, Fourier transform infrared spectroscopy, and UV−visible spectroscopy were used to characterize the composition, structure, and morphology of the tubes. Powder X-ray diffraction results showed that a wurtzite crystalline phase was obtained. The UV−visible absorption spectrum was red-shifted by 25 nm due to narrowing of the ZnO band gap (3.22 eV) as a result of Co doping. Similarly, green band emission was not observed in the emission spectrum, while emission lifetime was determined to be 620 ps from photoluminescence studies.