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    Spatial and Mechanical Properties of Dilute DNA Monolayers on Gold Imaged by AFM

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    Spatially distributed DNA oligomer arrays on Au(111) surfaces were created by one-step co-assembly of mixed monolayers of alkanethiol-conjugated DNA and mercaptohexanol (MCH). Tapping-mode AFM was used to visualize the distribution of DNA molecules on the surface and to study the mechanical properties of individual molecules. The DNA coating density increased nonlinearly with increasing mole fraction of DNA oligomer to MCH in the coating solution. For imaging in air, where surfaces are coated with a thin layer of water, the interaction between the AFM tip and the different structures on the monolayer varies between attractive and repulsive depending on the tapping amplitude, set-point ratio, and tip shape. It was found that both duplex and single-stranded DNA molecules extend approximately vertically upward from the surface.

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    Description

    Title : Spatial and Mechanical Properties of Dilute DNA Monolayers on Gold Imaged by AFM
    Author(s) : Donats Erts, Boris Polyakov, Håkan Olin, Eimer Tuite
    Abstract : Spatially distributed DNA oligomer arrays on Au(111) surfaces were created by one-step co-assembly of mixed monolayers of alkanethiol-conjugated DNA and mercaptohexanol (MCH). Tapping-mode AFM was used to visualize the distribution of DNA molecules on the surface and to study the mechanical properties of individual molecules. The DNA coating density increased nonlinearly with increasing mole fraction of DNA oligomer to MCH in the coating solution. For imaging in air, where surfaces are coated with a thin layer of water, the interaction between the AFM tip and the different structures on the monolayer varies between attractive and repulsive depending on the tapping amplitude, set-point ratio, and tip shape. It was found that both duplex and single-stranded DNA molecules extend approximately vertically upward from the surface.
    Subject : unspecified
    Area : Other
    Language : English
    Year : 2003

    Affiliations Mid Sweden University
    Journal : The Journal of Physical Chemistry B
    Volume : 107
    Issue : 15
    Pages : 3591 - 3597
    Url : http://pubs.acs.org/doi/abs/10.1021/jp0261657
    Doi : 10.1021/jp0261657

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    Hakan's Peer Evaluation activity

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