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- W2127964207 abstract "We have investigated the structure of single-stranded (ss) DNA self-assembled monolayers (SAMs) on gold by combining peak force tapping, Kelvin probe and phase contrast atomic force microscopy (AFM) techniques. The adhesion, surface potential and phase shift signals show heterogeneities in the DNA film structure at two levels: microscale and nanoscale; which cannot be clearly discerned in the topography. Firstly, there is multilayer aggregation covering less than 5% of the surface. The DNA multilayers seem to be ordered phases and their existence suggests that DNA end-to-end interaction can play a role in the self-assembly process. Secondly, we find the formation of two phases in the DNA monolayer, which differ both in surface energy and surface potential. We relate the two domains to differences in the packing density and in the ssDNA conformation. The discovered heterogeneities in ssDNA SAMs provide a new scenario in our vision of these relevant films that have direct consequences on their biological, chemical and physical properties." @default.
- W2127964207 created "2016-06-24" @default.
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- W2127964207 date "2013-01-01" @default.
- W2127964207 modified "2023-10-16" @default.
- W2127964207 title "Atomic force microscopy reveals two phases in single stranded DNA self-assembled monolayers" @default.
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- W2127964207 doi "https://doi.org/10.1039/c3nr01186k" @default.
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