Self-Assembled Porphyrins on Modified Zinc Oxide Nanorods: Development of Model Systems for Inorganic鈥揙rganic Semiconductor Interface Studies

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• 作者：Hanna Saarenp盲盲 ; Essi Sariola-Leikas ; Alexander Pyymaki Perros ; Juha M. Kontio ; Alexander Efimov ; Hironobu Hayashi ; Harri Lipsanen ; Hiroshi Imahori ; Helge Lemmetyinen ; Nikolai V. Tkachenko
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：January 26, 2012
• 年：2012
• 卷：116
• 期：3
• 页码：2336-2343
• 全文大小：472K
• 年卷期：v.116,no.3(January 26, 2012)
• ISSN：1932-7455

文摘

Dense arrays of zinc oxide nanorods with high specific surface areas were grown by hydrothermal method and functionalized by self-assembled monolayer (SAM) of porphyrins. The growth process was optimized to obtain dense arrays of nanorods with diameter of 60鈥?0 nm and length up to 1.5 渭m. The increase in the effective surface area was monitored by comparing the absorbances of SAM deposited both on the flat and nanorod surfaces of ZnO. To alter further semiconductor-organic SAM interactions, a 2 or 5 nm thick layer of either Al₂O₃ or TiO₂ was deposited on the ZnO nanorods. The present results show that both carboxylic acid and triethoxysilane anchors can be used to form porphyrin SAMs on the studied metal oxide substrates, and the electronic interactions between the metal oxide and porphyrin SAM are strongly modified by a thin layer of Al₂O₃ or TiO₂. These hybrid semiconductor-organic SAM constructions present promising model systems for advanced spectroscopy studies of semiconductor-organic interfaces with high degree of control over electronic interactions and system morphology.