Citation: LI Ming-Ji, WANG Xiu-Feng, LI Hong-Ji, WU Xiao-Guo, QU Chang-Qing, YANG Bao-He. Growth Characteristics of Single-Crystalline MgO Nanobelts and Its Photoluminescence Properties[J]. Chinese Journal of Inorganic Chemistry, ;2013, 29(6): 1199-1205. doi: 10.3969/j.issn.1001-4861.2013.00.190 shu

Growth Characteristics of Single-Crystalline MgO Nanobelts and Its Photoluminescence Properties

1.
1. Tianjin Key Laboratory of Film Electronic and Communicate Devices, College of Electronics Information Engineering, Tianjin University of Technology, Tianjin 300384, China;

Received Date: 4 January 2012
Available Online: 5 March 2013
Fund Project: 国家自然科学基金(No.50972105) (No.50972105)天津市自然科学基金(No.10SYSYJC27700) (No.10SYSYJC27700)国家高技术研究发展计划(863)(No.2013AA030801)资助项目。 (863)(No.2013AA030801)

Single-crystal MgO nanobelts were synthesized by direct current (DC) arc plasma jet chemical vapor deposition (CVD) on Mo substrates. An attempt has been made to prepare MgO nanobelts through decomposition of magnesium nitrate under argon and hydrogen flow at 950 ℃ for different durations. The MgO nanobelts were characterized by scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), and powder X-ray diffraction (XRD) pattern. When reaction time was increased from 0.5 to 12 min, the initially formed “tadpole-like” MgO nanostructures transformed into “dendrite-like” structures, nanobelts, and finally nanorods. The “tadpole-like” nanostructures are mainly belts with Mo nanoparticles capped at the MgO nanobelts’ ends, and the nanostructure is covered by an amorphous layer. The nanobelts prepared after 5 min with widths ranging from 30 to 50 nm. The growth of MgO nanobelts was initiated by Mo catalyst nanoparticles via a catalyst-assisted vapor-liquid-solid (VLS) process, and a side growth along the belt width direction via a vapor-solid (VS) process was also suggested. Moreover, the MgO nanobelts exhibited strong ultraviolet-blue emission. The strong optical properties were correlated with large surface area and presence of oxide ions in low coordination (LC) O_LC^2- (where LC=5C, 4C and 3C for terrace, edge, corner and kink sites, respectively) along with defects, which was revealed by fourier transform Infrared (FTIR) spectrometer and photoluminescence (PL) spectroscopy studies. Our group for the first time reported the DC arc plasma jet CVD method to obtain single crystalline MgO nanobelts, which possesses the advantages of being simple, economical, fast, effective and environmentally benign.
- DC arc plasma jet CVD;MgO;nanobelts;photoluminescence
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