Growth mechanism and characterization of rose-like microspheres and hexagonal microdisks of ZnO grown by surfactant-free solution method

Q. Ahsanulhaq; J.H. Kim; N.K. Reddy; Y.B. Hahn

Journal of Industrial and Engineering Chemistry, Vol.14, No.5, 578-583, September, 2008

DOI10.1016/j.jiec.2008.09.001 Export Citation

Growth mechanism and characterization of rose-like microspheres and hexagonal microdisks of ZnO grown by surfactant-free solution method

Q. Ahsanulhaq, J.H. Kim , N.K. Reddy, and Y.B. Hahn^†

School of Semiconductor and Chemical Engineering, BK21 Center for Future Energy Materials and Devices,and Nanomaterials Processing Research Center, Chonbuk National University, Jeonju 561-756, South Korea

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Highly crystalline rose-like microspheres made of nanosheets and hexagonal microdisks of zinc oxide (ZnO) were grown on Si and ZnO/Si substrates, respectively in solution at 90 8C without the use of any surfactants. The microdisks had lower defects and better optical properties than the microspheres and showed a strong UVemission at 378 nm. A possible growth mechanism based on the electrostatic forces between polarized ZnO nanostructures and substrates and the surface energy was proposed for the growth of microspheres and microdisks.

Keywords:ZnO microstructures;Growth mechanism;Solution method

[References]

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[8] Wan Q, Lin CL, Yu XB, Wang TH, Appl. Phys. Lett., 84, 124 (2004)

[9] Konenkamp R, Word RC, Godinez M, Nano Lett., 5, 2005 (2005)

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[11] Garcia T, Solsona B, Taylor SH, Appl. Catal. B: Environ., 66(1-2), 92 (2006)

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[21] Dai L, Chen XL, Wang WJ, Zhou T, Hu BQ, J. Phys. Condens. Matter., 15, 2221 (2003)

[22] Hu JQ, Bando Y, Appl. Phys. Lett., 82, 1401 (2003)

[23] Kakiuchi K, Hosono E, Kimura T, Imai H, Fujihara S, J. Sol.Gel Sci. Technol., 39, 63 (2006)

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