2010/06/28 by Kim MKelvey, Martin A. Edwards, Patrick R. Unwin · 2 citations
Chemistry · Physics and Astronomy · Chemical Engineering · #Electrochemical Analysis and Applications #Force Microscopy Techniques and Applications #Analytical Chemistry and Sensors #Scanning electrochemical microscopy #Chemistry #Microscopy #Ultramicroelectrode #Electrochemistry #Nanotechnology #Scanning probe microscopy #Optics #Electrode #Cyclic voltammetry
paper · doi:10.1021/ac101099e
openalex publication_date 2010/06/28 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30
A new scanning electrochemical microscopy (SECM) tip positioning method that allows surface topography and activity to be resolved simultaneously and independently is presented. The tip, controlled by a piezoelectric positioner operated in closed loop, is oscillated normal to the substrate surface. Changes in the oscillation amplitude, caused by the intermittent contact (IC) of the tip with the substrate surface, are used as a feedback signal to control the tip height. The method is illustrated with amperometric feedback approach curve measurements to inert (insulating) and active (conducting) substrates using 12.5 and 1 microm radii Pt disk electrodes. Imaging of gold bands on a glass substrate demonstrates the capabilities for simultaneous topography and activity mapping. The prospect for using IC methodology more widely with other types of tips is highlighted briefly.