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Received August 29, 2010
Accepted October 19, 2010
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Formation of 1-D ZnTe nanocrystals by aerosol-assisted spray pyrolysis
Department of Chemical and Biomolecular Engineering, Sogang University, Seoul 121-742, Korea 1Department of Chemical Engineering, University of Ulsan, Ulsan 680-749, Korea
koo@sogang.ac.kr
Korean Journal of Chemical Engineering, April 2011, 28(4), 1120-1125(6), 10.1007/s11814-010-0458-2
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Abstract
One-dimensional (1-D) ZnTe nanowires were prepared by aerosol-assisted spray pyrolysis using a mixture of ZnO (1 mmol)/OA (4 mL)/TOPO (0.8 g)/ODE (4 mL) as Zn precursor and Te/TOP (3 mL of 0.75M) as Te precursor. The shape, size, and crystal structure of products were characterized by means of transmission electron microscope (TEM) and X-ray diffraction (XRD). The shape evolution of ZnTe nanocrystals from nanodots to nanowires was achieved by controlling the reaction temperature. ZnTe nanodots with average diameter of 8.3 nm were synthesized at 300 ℃ . “Earthworm-like” shaped ZnTe (linear ZnTe aggregates) consisting of primary ZnTe nanodots of about 16 nm in diameter were obtained at 400 ℃ . In addition, 1-D ZnTe nanowires were prepared at reaction temperature higher than 450 ℃ . Those experimental results suggest that ZnTe nanowires with zinc blende structure are formed from ZnTe nanodots by the oriented attachment due to insufficient surface capping of surfactant molecules and by strong dipole-dipole interaction of nanodots, followed by self-organization of linear aggregates at higher reaction temperatures. The linear ZnTe aggregates consisting of primary ZnTe nanodots may be an intermediate stage in the formation process of nanowires from nanodots.
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References
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Li YD, Ding Y, Wang ZY, Adv. Mater., 11(10), 847 (1999)
Jun YW, Choi CS, Cheon J, Chem. Commun., 101 (2001)
Yong KT, Sahoo Y, Zeng H, Swihart MT, Minter JR, Prasad PN, Chem. Mater., 19, 4108 (2007)
Wang FD, Dong AG, Sun JW, Tang R, Yu H, Buhro WE, Inorg. Chem., 45(19), 7511 (2006)
Fanfair DD, Korgel BA, Cryst. Growth Des., 8, 3246 (2008)
Meng QF, Jiang CB, Mao SX, J. Cryst. Growth, 310(20), 4481 (2008)
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Kim DJ, Koo KK, Cryst. Growth Des., 9, 1153 (2009)
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Xia B, Lenggoro IW, Okuyama K, Adv. Mater., 13(20), 1579 (2001)
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Skrabalak SE, Suslick KS, J. Am. Chem. Soc., 127(28), 9990 (2005)
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Yu JH, Joo J, Park HM, Baik SI, Kim YW, Kim SC, Hyeon T, J. Am. Chem. Soc., 127(15), 5662 (2005)
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Yu WW, Wang YA, Peng X, Chem. Mater., 15, 4300 (2003)
Peng XG, Adv. Mater., 15(5), 459 (2003)
