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Issue 18, 2012
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From dewetting to wetting molecular layers: C60 on CaCO3(10[1 with combining macron]4) as a case study

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Abstract

We report the formation of extended molecular layers of C60 molecules on a dielectric surface at room temperature. In sharp contrast to previous C60 adsorption studies on prototypical ionic crystal surfaces, a wetting layer is obtained when choosing the calcite (CaCO3)(10[1 with combining macron]4) surface as a substrate. Non-contact atomic force microscopy data reveal an excellent match of the hexagonal lattice of the molecular layer with the unit cell dimension of CaCO3(10[1 with combining macron]4) in the [01[1 with combining macron]0] direction, while a lattice mismatch along the [[4 with combining macron][2 with combining macron]61] direction results in a large-scale moiré modulation. Overall, a (2 × 15) wetting layer is obtained. The distinct difference observed microscopically upon C60 adsorption on CaCO3(10[1 with combining macron]4) compared to other dielectric surfaces is explained by a macroscopic picture based on surface energies. Our example demonstrates that this simple surface-energy based approach can provide a valuable estimate for choosing molecule–insulator systems suitable for molecular self-assembly at room temperature.

Graphical abstract: From dewetting to wetting molecular layers: C60 on CaCO3(10 [[1 with combining macron]] 4) as a case study

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Publication details

The article was received on 17 Jan 2012, accepted on 08 Mar 2012 and first published on 08 Mar 2012


Article type: Paper
DOI: 10.1039/C2CP40172J
Citation: Phys. Chem. Chem. Phys., 2012,14, 6544-6548
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    From dewetting to wetting molecular layers: C60 on CaCO3(10[1 with combining macron]4) as a case study

    P. Rahe, R. Lindner, M. Kittelmann, M. Nimmrich and A. Kühnle, Phys. Chem. Chem. Phys., 2012, 14, 6544
    DOI: 10.1039/C2CP40172J

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