Simultaneous Interfacial Reactivity and Topography Mapping with Scanning Ion Conductance Microscopy.

Analytical Chemistry
Dmitry MomotenkoPatrick R Unwin

Abstract

Scanning ion conductance microscopy (SICM) is a powerful technique for imaging the topography of a wide range of materials and interfaces. In this report, we develop the use and scope of SICM, showing how it can be used for mapping spatial distributions of ionic fluxes due to (electro)chemical reactions occurring at interfaces. The basic idea is that there is a change of ion conductance inside a nanopipet probe when it approaches an active site, where the ionic composition is different to that in bulk solution, and this can be sensed via the current flow in the nanopipet with an applied bias. Careful tuning of the tip potential allows the current response to be sensitive to either topography or activity, if desired. Furthermore, the use of a distance modulation SICM scheme allows reasonably faithful probe positioning using the resulting ac response, irrespective of whether there is a reaction at the interface that changes the local ionic composition. Both strategies (distance modulation or tuned bias) allow simultaneous topography-activity mapping with a single channel probe. The application of SICM reaction imaging is demonstrated on several examples, including voltammetric mapping of electrocatalytic reactions on electrodes a...Continue Reading

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Citations

Jul 12, 2016·Langmuir : the ACS Journal of Surfaces and Colloids·Minkyung KangPatrick R Unwin
Aug 30, 2016·ACS Nano·Dmitry MomotenkoPatrick R Unwin
May 10, 2017·Proceedings. Mathematical, Physical, and Engineering Sciences·Ashley PagePatrick R Unwin
Aug 12, 2016·The Analyst·Yunshan FanBo Zhang
Jun 13, 2018·Annual Review of Analytical Chemistry·Shudong ZhangYuanhua Shao
Jul 13, 2018·Faraday Discussions·Cameron L Bentley, Patrick R Unwin
Oct 31, 2018·Biosensors·Marta Maria Pereira da Silva Neves, Daniel Martín-Yerga
Feb 18, 2021·Analytical Chemistry·Nako NakatsukaDmitry Momotenko
Jun 25, 2021·Chemical Science·N LimaniR Cornut
Oct 11, 2017·Analytical Chemistry·David PerryPatrick R Unwin
Mar 24, 2018·Analytical Chemistry·Nicolas SchierbaumTilman E Schäffer
Feb 27, 2019·Analytical Chemistry·Faduma M MaddarPatrick R Unwin
Sep 29, 2019·Analytical Chemistry·Je Hyun BaeMichael V Mirkin
Jan 21, 2017·Analytical Chemistry·Yasufumi TakahashiTomokazu Matsue
Jan 21, 2017·Analytical Chemistry·Wenqing ShiLane A Baker
Dec 1, 2018·Analytical Chemistry·Cameron L BentleyPatrick R Unwin
Nov 30, 2018·Journal of the American Chemical Society·Cameron L BentleyPatrick R Unwin
Dec 10, 2020·Chemical Reviews·Cheng ZhuLane A Baker

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