Combined Ion Conductance and Atomic Force Microscope for Fast Simultaneous Topographical and Surface Charge Imaging

Analytical Chemistry
Livie Dorwling-CarterDmitry Momotenko

Abstract

We report here an advanced approach for simultaneous and independent submicroscale imaging of local surface charge and topography using microchanneled cantilevers, also known as FluidFM nanopipette probes. These hollow cantilevers with a 300 nm opening are employed for ion current measurements that provide access to the local properties of the electrical double layer using the phenomenon of ion current rectification, while also taking advantage of the force sensing capabilities for accurate probe vertical positioning and topography imaging. The independent nature of this atomic force microscope (AFM) feedback opens up a possibility to significantly increase the sensitivity for probing local surface charges in a wider range of salt concentrations, especially in electrolytes of low ionic strength (below 10 mM), where classical local ion conductance measurements with glass nanopipettes would suffer from inaccuracies and instabilities, but where the electrical double layer extends further into the liquid medium and has stronger effect on the measured ion currents for charge imaging. We demonstrate that the measurements with FluidFM do not compromise the positioning accuracy and enable accurate and simultaneous topographical and cha...Continue Reading

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Citations

Jul 17, 2019·Nature Nanotechnology·Morteza ArameshJános Vörös
Feb 27, 2019·Analytical Chemistry·Faduma M MaddarPatrick R Unwin
Nov 15, 2018·Analytical Chemistry·Jingshu HuiJoaquín Rodríguez-López
Dec 1, 2018·Analytical Chemistry·Cameron L BentleyPatrick R Unwin
Dec 10, 2020·Chemical Reviews·Cheng ZhuLane A Baker

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