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J Colloid Interface Sci. 2013 Feb 15;392:158-66. doi: 10.1016/j.jcis.2012.07.061. Epub 2012 Oct 11.

Covalent molecular assembly: construction of ultrathin multilayer films by a two-dimensional fabrication method.

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  • 1Department of Chemical and Biomolecular Engineering, National University of Singapore, Singapore.


A two-dimensional fabrication method was employed to assemble ultrathin multilayer films with specific three-dimensional structures by making use of interlayer and intralayer covalent bonding. The films were assembled in a layer-wise fashion on a silicon surface using bi- and multi-functional molecules as building blocks and strengthened by lateral cross-linking. The fabrication process could be controlled at the sub-nano-scale with the roughness of the surface after deposition of each layer within 0.2 nm. The film showed better resistance to harsh environments than randomly cross-linked or linearly linked films of comparable thickness. The combination of covalent LbL assembly and lateral cross-linking has significant potential as a method of fabrication for assembling nano-structures for a variety of applications.

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