Paresh Shimpi et al 2009 Nanotechnology 20 125608 doi:10.1088/0957-4484/20/12/125608
Low temperature synthesis and characterization of MgO/ZnO composite nanowire arrays
Paresh Shimpi1, Pu-Xian Gao1,3, Daniel G Goberman1 and Yong Ding2
Show affiliationsLarge scale dendritic MgO/ZnO composite nanowire arrays have been successfully synthesized on Si substrates using a two-step sequential hydrothermal synthesis at low temperature for the first time. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM), and x-ray photoelectron spectroscopy (XPS) were systematically carried out to confirm and elaborate the potentially localized Mg surface alloying process into the ZnO nanowire arrays. Both room temperature and low temperature (40 K) photoluminescence results revealed an enhanced and blue-shifted near-band-edge (NBE) ultraviolet (UV) emission for the MgO/ZnO nanowires compared to those of the pure ZnO nanowire arrays, indicating the success of Mg alloying into ZnO nanowires. This enhancement might be due to the 155 °C hydrothermal process and the amorphous MgO layer in the MgO/ZnO nanowires. The specific template of densely packed ZnO nanowire arrays was suggested to be instrumental in enabling this type of MgO/ZnO composite nanowire growth.
- PACS
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81.16.-c Methods of nanofabrication and processing
78.67.-n Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures
68.37.Lp Transmission electron microscopy (TEM)
81.07.-b Nanoscale materials and structures: fabrication and characterization
- Subjects
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Condensed matter: electrical, magnetic and optical
- Dates
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Issue 12 (25 March 2009)
Received 4 November 2008, in final form 14 January 2009
Published 4 March 2009
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Low temperature synthesis and characterization of MgO/ZnO composite nanowire arrays
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