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Frontiers of Materials Science

ISSN 2095-025X

ISSN 2095-0268(Online)

CN 11-5985/TB

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Front Mater Sci    2011, Vol. 5 Issue (3) : 311-321    https://doi.org/10.1007/s11706-011-0143-3
RESEARCH ARTICLE
Synthesis temperature dependence of morphologies and properties of cobalt oxide and silicon nanocrystals
Akimasa KOJI1,2, Javed IQBAL1, Rong-Hai YU1, Zheng-Jun ZHANG1()
1. Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China; 2. Department of Metallurgy and Ceramics Science, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo 152-8552, Japan
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Abstract

Cobalt and cobalt oxide nanocrystals were synthesized on Si substrates from aqueous cobalt nitrate [Co(NO3)2·6H2O] powder via chemical vapor deposition method. Scanning electron microscope, field emission scanning electron microscope, and transmission electron microscope observations show different morphologies, such as continuous films, nano-bars, nano-dices, and nano-strings, depending on the synthesis temperature. The crystal structure characterization was conducted using X-ray diffraction methods. Furthermore, the properties of the samples were characterized using Raman spectroscopic analysis and vibrating sample magnetometer. The morpholo- gy change was discussed in terms of synthesis environments and chemical interactions between cobalt, oxygen, and silicon.
Keywords cobalt oxide      nanostructure      temperature dependence      magnetic property     
Corresponding Author(s): ZHANG Zheng-Jun,Email:zjzhang@tsinghua.edu.cn   
Issue Date: 05 September 2011
 Cite this article:   
Akimasa KOJI,Javed IQBAL,Rong-Hai YU, et al. Synthesis temperature dependence of morphologies and properties of cobalt oxide and silicon nanocrystals[J]. Front Mater Sci, 2011, 5(3): 311-321.
 URL:  
https://academic.hep.com.cn/foms/EN/10.1007/s11706-011-0143-3
https://academic.hep.com.cn/foms/EN/Y2011/V5/I3/311
Fig.1  SEM images of samples synthesized at high temperature for 6 h with 50 sccm N gas flow: CoO continuous film and CoO whiskers synthesized at 500°C; CoO nano-bars with CoO–Co clusters synthesized at 700°C; CoO–Co nano-dices synthesized at 900°C; Co nano-flakes, Si nano-strings, CoO, SiN, and CoSi, synthesized at 1100°C; Si nano-strings synthesized at 1100°C, grown on Si (100) substrate in N atmosphere.
Fig.2  FE-SEM cross-sectional images of Co nano-flakes, Si nano-strings, CoO, SiN, and CoSi, synthesized at 1100°C. TEM images of Co nano-flakes and Si nano-strings.
Fig.3  XRD profiles of the layers synthesized at 300°C, 500°C, 700°C, 900°C, and 1100°C.
Fig.4  GADDS pictures of the layers synthesized at 300°C, 500°C, 700°C, 900°C, and 1100°C. (Width: 16.7; Time: 300 s; 2: 36°; : 9.65°; psi: 0° [(a)(b)(c)(d)(e)], 89.2° [(f)])
Fig.5  Raman spectra (514.5 nm) measured at room temperature for different samples: CoO continuous film synthesized at 300°C; CoO whiskers synthesized at 500°C; CoO nano-bars and CoO–Co clusters synthesized at 700°C; CoO–Co nano-dices synthesized at 900°C; Co nano-flakes with Si nano-strings synthesized at 1100°C.
Fig.6  Hysteresis curves measured at room temperature for layers synthesized at 300°C, 500°C, 700°C, 900°C, and 1100°C.
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