역마이셀을 이용한 Sm2O3 도핑 CeO2 나노분말의 합성 및 특성

김준섭; 배동식; Jun Seop Kim; Dong Sik Bae

Korean Journal of Materials Research, Vol.22, No.4, 207-210, April, 2012

DOI10.3740/MRSK.2012.22.4.207 Export Citation

역마이셀을 이용한 Sm2O3 도핑 CeO2 나노분말의 합성 및 특성

Synthesis and Characterization of Sm2O3 Doped CeO2 Nanopowder by Reverse Micelle Processing

김준섭, 배동식^†

창원대학교 나노신소재공학부

Jun Seop Kim, and Dong Sik Bae^†

School of nano & advanced material Eng., Changwon National University, Gyeongnam 641-773, Korea

E-mail:

The preparation of Sm2O3 doped CeO2 in Igepal CO-520/cyclohexane reverse micelle solutions has been studied. In the present work, we synthesized nanosized Sm2O3 doped CeO2 powders by reverse micelle process using aqueous ammonia as the precipitant; hydroxide precursor was obtained from nitrate solutions dispersed in the nanosized aqueous domains of a micro emulsion consisting of cyclohexane as the oil phase, and poly (xoyethylene) nonylphenylether (Igepal CO-520) as the non-ionic surfactant. The synthesized and calcined powders were characterized by Thermogravimetry-differential thermal analysis (TGA-DTA), X-ray diffraction analysis (XRD), and Transmission electron microscopy (TEM). The crystallite size was found to increase with increase in water to surfactant (R) molar ratio. Average particle size and distribution of the synthesized Sm2O3 doped CeO2 were below 10 nm and narrow, respectively. TG-DTA analysis shows that phase of Sm2O3 doped CeO2 nanoparticles changed from monoclinic to tetragonal at approximately 560oC. The phase of the synthesized Sm2O3 doped CeO2 with heating to 600oC for 30 min was tetragonal CeO2. This study revealed that the particle formation process in reverse micelles is based on a two step model. The rapid first step is the complete reduction of the metal to the zero valence state. The second step is growth, via reagent exchanges between micelles through the inter-micellar exchange.

Keywords:Sm2O3 doped CeO2;nanopowder;reverse micelle process

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[3] Maki Y, Matsuda M, Kudo T, US Patent, No.3607424, USA (1971). (1971)

[4] Riess I, J. Electrochem. Soc., 128, 2077 (1981)

[5] Yahiro H, Eguchi Y, Eguchi K, Arai H, J. Appl. Electrochem., 18, 527 (1988)

[6] Steele BCH, Recent Trends and Applications, p. 402, ed. Takahashi T, World Scientific, London, UK (1989). (1989)

[7] Higashi K, Sonoda K, Ono H, Sameshima S, Hirata Y, J. Mater. Res., 14, 957 (1999)

[8] Huang K, Feng M, Goodenough JB, J. Am. Ceram. Soc., 81, 357 (1998)

[9] Yamashita K, Ramanujachary KV, Greenblatt M, Solid State Ion., 81(1-2), 53 (1995)

[10] Boutonnet M, Kizling J, Stenius P, Maire G, Colloid. Surface., 5, 209 (1982)

[11] Kim HJ, Bae DS, Kor. J. Mat. Res., 21(10), 568 (2011)

[12] Fang J, Wang J, Ng SC, Chew CH, Gan LM, Nanostruct. Mater., 8, 499 (1997)

[13] Bae DS, Han KS, Adair JH, J. Am. Ceram. Soc., 85(5), 1321 (2002)

[14] Son JH, Park HY, Kang DP, Bae DS, Colloid. Surface. Physicochem. Eng. Aspect., 313-314, 105 (2008)

[15] Wang J, Fang J, Ng SC, Gan LM, Chew CH, Wang X, Shen Z, J. Am. Ceram. Soc., 82, 873 (1999)

[16] Zarur AJ, Ying JY, Nature, 403, 65 (2000)

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[19] Osseo-Asare K, Handbook of Microemulsion Science and Technology, p. 549-603, ed. Kumar P, Mittal KL, Marcel Dekker Inc., NY, USA (1999). (1999)