Electrodeposition of Epitaxial Magnetite Films and Ferrihydrite Nanoribbons on Single-Crystal Gold

详细信息    查看全文

• 作者：Elizabeth A. Kulp ; Hiten M. Kothari ; Steven J. Limmer ; Jinbo Yang ; Rakesh V. Gudavarthy ; Eric W. Bohannan ; Jay A. Switzer
• 刊名：Chemistry of Materials
• 出版年：2009
• 出版时间：November 10, 2009
• 年：2009
• 卷：21
• 期：21
• 页码：5022-5031
• 全文大小：1170K
• 年卷期：v.21,no.21(November 10, 2009)
• ISSN：1520-5002

文摘

Magnetite (Fe₃O₄), ferrihydrite (Fe₁₀O₁₄(OH)₂), and iron (Fe) films were electrodeposited by cathodic deposition from an alkaline Fe(III)−triethanolamine solution. The electrodeposited phase depended on the applied potential. Magnetite films were electrodeposited from −1.01 to −1.10 V vs Ag/AgCl, whereas ferrihydrite films were deposited from −1.10 to −1.20 V vs Ag/AgCl. Iron deposition occurred at more negative potentials. The polycrystalline films were characterized using X-ray diffraction, scanning electron microscopy, and Mssbauer spectroscopy. Epitaxial magnetite films on low-index gold crystals were produced at three different potentials. X-ray diffraction analysis of the magnetite films deposited at −1.01, −1.05, and −1.10 V vs Ag/AgCl showed [111] oriented films on Au(111) and Au(001). Because of twinning of the {111} planes, the [511] orientation was present in thicker films. Magnetite grew with a [110] orientation on Au(110). At the more negative potentials of −1.10 and −1.20 V vs Ag/AgCl, ferrihydrite deposited with an (110) orientation.