Nano Archive

Self-Assembled Hybrid Bilayers of Palladium Alkanethiolates

John, Neena Susan and Thomas, P. John and Kulkarni, G. U. (2003) Self-Assembled Hybrid Bilayers of Palladium Alkanethiolates. Journal of Physical Chemistry B, 107 (41). pp. 11376-11381. ISSN 10895647

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Octane (C8), dodecane (C12), and hexadecane (C16) thiolates of palladium, as well as their binary mixtures covering the entire range of compositions, have been prepared from organic media and characterized using powder X-ray diffraction (XRD), infrared spectroscopy (FTIR), and scanning tunneling microscopy (STM). All thiolatesmono as well as mixedadopt bilayered lamellar structures as evidenced by XRD and STM. In monothiolates, the thickness of the bilayer as measured by the d001 spacing is governed by the length of the alkyl chain, while in hybrid bilayers, the thickness depends on the binary composition as well. In C8−C12 and C12−C16 bilayers, in which the difference in the chain lengths of the constituent thiols is four methylene units, the thickness varies nearly proportionally to the weighted average of the chain lengths. In contrast, the C8−C16 system shows a steplike behavior with only a few compositions (C8, 60−80%) exhibiting intermediate d values. The alkyl chains are in all-trans conformation in monothiolates, while in hybrid bilayers, especially in C12−C16, gauche defects are observed, their concentration being the highest around 50:50 composition. Interestingly, these hybrid thiolates seem to provide adequate free volume to entrap small molecular species.

Item Type:Article
Subjects:Material Science > Nanofabrication processes and tools
Material Science > Nanochemistry
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
Faculty of Engineering, Science and Mathematics > School of Chemistry
ID Code:4410
Deposited By:JNCASR
Deposited On:03 Apr 2009 06:34
Last Modified:03 Apr 2009 06:34

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