Well-Aligned <mml:math id="E1" xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mrow><mml:mtext>IrO</mml:mtext></mml:mrow><mml:mtext>2</mml:mtext></mml:msub></mml:mrow></mml:math> Nanocrystals

Korotcov, Alexandru; Chen, Reui-San; Hsu, Hung-Pin; Huang, Ying-Sheng; Tsai, Dah-Shyang; Tiong, Kwong-Kau

doi:https://doi.org/10.1155/2007/84845

Journal of Nanomaterials

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Review Article | Open Access

Volume 2007 | Article ID 084845 | https://doi.org/10.1155/2007/84845

Well-Aligned IrO2 Nanocrystals

Alexandru Korotcov,^1,2Reui-San Chen,^1,3Hung-Pin Hsu,¹Ying-Sheng Huang,¹Dah-Shyang Tsai,⁴and Kwong-Kau Tiong⁵

Academic Editor: Berger Shlomo

Received27 Feb 2007

Accepted16 Aug 2007

Published04 Nov 2007

Abstract

We review the results of synthesis of well-aligned IrO2 nanocrystals (NCs) on sapphire (SA), LiNbO3 (LNO), LiTaO3 (LTO) substrates via reactive magnetron sputtering and metal-organic chemical vapor deposition. The surface morphology and structural properties of the as-deposited NCs were characterized. Field emission scanning electron microscopy micrographs reveal that NCs grown on SA(100)/LNO(100) are vertically aligned, while the NCs on SA(012)/LTO(012) and SA(110) contain singly and doubly tilted alignments, respectively, with a tilt angle of ∼35∘ from the normal to the substrates. NCs grown on SA(001) show in-plane alignment with mosaic structure. The X-ray diffraction results indicate that the NCs are (001), (101), and (100) oriented on SA(100)/LNO(100), SA(012)/LTO(012)/SA(110), and SA(001) substrates, respectively. A strong substrate effect on the alignment of the IrO2 NCs deposition has been demonstrated. The roles of different substrates in the formation of various textures of nanocrystalline IrO2 are studied and the possible mechanisms have been discussed.

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Copyright © 2007 Alexandru Korotcov et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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