Combined Scanning Probe Techniques for In-Situ Electrochemical Imaging at a Nanoscale

Wiedemair, Justyna; Mizaikoff, Boris; Kranz, Christine

doi:10.1007/978-3-540-37316-2_8

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“…Particularly popular is the design of Kranz et al in which a central thorn is used for SFM imaging that is surrounded by a frame-shaped or ring-shaped electrode recessed from the tip of the apex [28]. This design is robust enough to allow further functionalization and has been used successfully in a number of applications [36][37][38]. The need for the central thorn poses difficulties in miniaturizing the electrochemically active area because it must be at least as large as the base of the thorn.…”

Section: Introductionmentioning

confidence: 99%

Influence of electrode size and geometry on electrochemical experiments with combined SECM–SFM probes

et al. 2010

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Gold electrodes integrated into silicon scanning force microscopy (SFM) probes allow the acquisition of spatially correlated data for sample morphology (via SFM) and local electrochemical reactivity via scanning electrochemical microscopy (SECM). The lateral resolution of both techniques is controlled by different properties of the integrated probes. The topographic tracking provided by the SFM mechanism allows the realization of very small working distances for the SECM measurements. Microfabrication technology was used in order to reduce the size of the active electrode area of the tip into the sub-100 nm regime. The functionality of the probes was tested using electrochemical methods. Experiments revealed that the response could be quantitatively compared to numerical simulation. The low working distance, in combination with the small size of the active electrode area, allows for high lateral resolution in the SECM images. This is illustrated with different model substrates that cover a range of different rate constants and illustrate the dependence of the SECM contrast on the local kinetics of the sample in the sub-micrometre size range.

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