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Single-crystalline Sb2Te3 nanostructures, of which the bulk is one of the best thermoelectric materials at room temperature, are synthesized by chemical vapor deposition. The composition, crystal structure, and growth mechanism of the sample are investigated. According to our experimental results, Sb2Te3 normally grows into hexagonal nanoplates without using catalyst, but single-crystalline nanowires can be fabricated with Au nanoparticles as the catalyst. The growth mechanism of Sb2Te3 nanostructures is closely related to its anisotropic crystal structure. Sb2Te3 has a rhombohedral structure, which exhibits a layered anisotropy with the Te and Sb atom layers arranged along the c-axis. Moreover, there are two adjacent Te layers connected by van der Waals bonds. Therefore, Sb2Te3 prefers to grow into hexagonal plates in the ab-plane. When Au nanoparticles are used as the catalyst, the growth direction of the precipitated Sb2Te3 is restricted, leading to the formation of Sb2Te3 nanowires.
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Keywords:
- thermoelectric materials /
- Sb2Te3 /
- nanostructures /
- chemical vapor deposition
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[1] Wood C 1988 Rep. Prog. Phys. 51 459
[2] Harman T C, Taylor P J, Walsh M P, LaForge B E 2002 Science 297 2229
[3] Purkayastha A, Lupo F, Kim S, Borca-Tasciuc T, Ramanath G 2006 Adv. Mater. 18 496
[4] Snyder G J, Toberer E S 2008 Nat. Mater. 7 105
[5] Majumdar A 2004 Science 303 777
[6] Bell L E 2008 Science 321 1457
[7] Hicks L D, Dresselhaus M S 1993 Phys. Rev. B 47 12727
[8] Hicks L D, Dresselhaus M S 1993 Phys. Rev. B 47 16631
[9] Lin Y M, Sun X, Dresselhaus M S 2000 Phys. Rev. B 62 4610
[10] Heremans J P, Thrush C M, Morelli D T, Wu M C 2002 Phys. Rev. Lett. 88 216801
[11] Dresselhaus M S, Chen G, Tang M Y, Yang R, Lee H, Wang D, Ren Z, Fleurial J P, Gogna P 2007 Adv. Mater. 19 1043
[12] Wang W, Lu X, Zhang T, Zhang G, Jiang W, Li X 2007 J. Am. Chem. Soc. 129 6702
[13] Fardy M, Hochbaum A I, Goldberger J, Zhang M M, Yang P 2007 Adv. Mater. 19 3047
[14] Hochbaum A I, Chen R, Delgado R D, Liang W, Garnett E C, Najarian M, Majumdar A, Yang P 2008 Nature 451 163
[15] Boukai A I, Bunimovich Y, Tahir-Kheli J, Yu J K, Goddard W A, Heath J R Nature 451 168
[16] Shi W, Zhou L, Song S, Yang J, Zhang H 2008 Adv. Mater. 20 1892
[17] Sootsman J R, Chung D Y, Kanatzidis M G 2009 Angew. Chem. Int. Ed. 48 8616
[18] Lü Q, Rong J Y, Zhao L, Zhang H C, Hu J M, Xin J B 2005 Acta Phys. Sin. 54 3321 (in Chinese) [吕 强、荣剑英、赵 磊、张红晨、胡建民、信江波 2005 54 3321]
[19] Hu J M, Xin J B, Lü Q, Wang Y Y, Rong J Y 2006 Acta Phys. Sin. 55 4843 (in Chinese) [胡建民、信江波、吕 强、王月媛、荣剑英 2006 55 4843]
[20] Mao B, Liu B, Wang Y F, Li G N, Song Y Z, Ma L P, Liu G H 2009 Rare Metal Mat. Eng. 38 515 (in Chinese) [毛 斌、刘 斌、王运福、李工农、宋玉哲、马莉萍、刘国汉 2009 稀有金属材料与工程 38 515]
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