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High Resolution DNA Imaging by Dynamic Atomic Force Microscopy: The Effect of the Substrate and Sample Preparation

Published online by Cambridge University Press:  28 February 2014

Tzu-Chieh Tang ,
Carlo A. Amadei  and
Matteo Chiesa
Tzu-Chieh Tang
Affiliation:
Laboratory for Energy and NanoScience (LENS), Institute Center for Future Energy (iFES), Masdar Institute of Science and Technology, Abu Dhabi, UAE
Carlo A. Amadei
Affiliation:
Laboratory for Energy and NanoScience (LENS), Institute Center for Future Energy (iFES), Masdar Institute of Science and Technology, Abu Dhabi, UAE
Matteo Chiesa*
Affiliation:
Laboratory for Energy and NanoScience (LENS), Institute Center for Future Energy (iFES), Masdar Institute of Science and Technology, Abu Dhabi, UAE
*
*Email: mchiesa@masdar.ac.ae
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Abstract

Adsorption of charged biomolecules onto atomically flat mica substrates is facilitated by the deposition of metal ions. Despite successfully acting as preferential anchoring sites, the presence of ions on the mica surface also changes its physicochemical characteristics something that is rarely quantified from a nanoscale point of view. In this study the nanoscale physicochemical properties of nickel-functionalized Muscovite mica are investigated by reconstructing the conservative force profile between an atomic force microscopy (AFM) tip and the surface. Various nickel ion concentrations (i.e. 1.0 mM to 20.0 mM) along with different incubation times (30 seconds and 5 minutes) are directly analyzed. Details in the spatial and temporal variations in surface properties due to the ion mediated adsorption of water are presented in details and in light of the binding efficiency of the metal ions. This insight benefits our understanding in the behavior of ion distribution that plays a crucial role in biomolecule imaging using AFM.

Keywords

ion-exchange materialabsorptionscanning probe microscopy (SPM)
Type
Articles
Information
MRS Online Proceedings Library (OPL) , Volume 1652: Symposium LL – Advances in Scanning Probe Microscopy , 2014 , mrsf13-1652-ll05-19
Copyright
Copyright © Materials Research Society 2014 

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