Water desorption in Kelvin-probe force microscopy: a generic model

Patrick Mesquida; Dominik Kohl; Sneha Bansode; Melinda Duer; Georg Schitter

doi:10.1088/1361-6528/aae413

Water desorption in Kelvin-probe force microscopy: a generic model

Patrick Mesquida, Dominik Kohl, Sneha Bansode, Melinda Duer, Georg Schitter

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Abstract

Nanoparticles or similar, nanoscale objects such as proteins or biological fibrils usually have to be deposited from aqueous suspension onto a solid support surface for further characterization by atomic force microscopy (AFM) and related methods such as Kelvin-probe force microscopy (KFM). Here we show, on the examples of functionalized nanoparticles and collagen fibrils, that water desorption after sample preparation affects their electrostatic potential determined by KFM in a predictable manner. We explain this effect with a simple, analytical model based on the capacitance of the partially dielectric-filled tip-sample system. We also propose practical measures to avoid false interpretation of electrical AFM-based experiments. As the phenomenon is very generic it may have significant implications in the application of AFM to nanoparticles and other nanostructures including biological ones.

Original language	English
Pages (from-to)	1-9
Journal	NANOTECHNOLOGY
Volume	29
Issue number	50
Early online date	12 Oct 2018
DOIs	https://doi.org/10.1088/1361-6528/aae413
Publication status	Published - 14 Dec 2018

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10.1088/1361-6528/aae413

Water desorption in Kelvin-probe_MESQUIDA_Accepted25September2018_GREEN AAMAccepted author manuscript, 1.82 MBLicence: CC BY-NC-ND

http://iopscience.iop.org/article/10.1088/1361-6528/aae413

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abstract = "Nanoparticles or similar, nanoscale objects such as proteins or biological fibrils usually have to be deposited from aqueous suspension onto a solid support surface for further characterization by atomic force microscopy (AFM) and related methods such as Kelvin-probe force microscopy (KFM). Here we show, on the examples of functionalized nanoparticles and collagen fibrils, that water desorption after sample preparation affects their electrostatic potential determined by KFM in a predictable manner. We explain this effect with a simple, analytical model based on the capacitance of the partially dielectric-filled tip-sample system. We also propose practical measures to avoid false interpretation of electrical AFM-based experiments. As the phenomenon is very generic it may have significant implications in the application of AFM to nanoparticles and other nanostructures including biological ones.",

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AU - Kohl, Dominik

AU - Bansode, Sneha

AU - Duer, Melinda

AU - Schitter, Georg

PY - 2018/12/14

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Water desorption in Kelvin-probe force microscopy: a generic model

Abstract

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