UNSPECIFIED. (2002) Electrochemical imaging of diffusion through single nanoscale pores. ANALYTICAL CHEMISTRY, 74 (8). pp. 1841-1848. ISSN 0003-2700

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Abstract

A combined scanning electrochemical-atomic force microscope (SECM-AFM) has been used to probe the diffusional transport of target electroactive solutes in isolated nanopores of a track-etched membrane. A polycarbonate membrane (100-mn-diam pore size) hydrated with an electrolyte solution, containing a redox-active probe molecule, such as IrCl63- or Fe(phen)(3)(2+), functions as the model membrane system. The use of a mobile Pt-coated AFM probe enables individual solution-filled pores to be topographically identified. Analysis of the corresponding current images for the diffusion-limited oxidation of the redox mediator indicates that solution is largely confined to pores in the membrane. Moreover, the tip collector current response provides information on diffusion of the mediator through the pore. Force-distance tip approach and retract measurements allow the radius of contact between the electrochemical-AFM tip and solution confined within a pore at the point of pull-off to be estimated.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry
Journal or Publication Title:	ANALYTICAL CHEMISTRY
Publisher:	AMER CHEMICAL SOC
ISSN:	0003-2700
Date:	15 April 2002
Volume:	74
Number:	8
Number of Pages:	8
Page Range:	pp. 1841-1848
Identification Number:	10.1021/ac0157472
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/11081

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