Fig 4.

Comparison of microelectrode responses fabricated from DLC:N, Au, and ITO. Each electrode had a radius of 20 µm and was insulated with S1813 photoresist. Surfaces were cleaned with air plasma before testing. A: Cyclic voltammograms for a 1 mM K₃Fe(CN)₆ solution in 0.1 M KCl, pH 3.0, scan rate 1 V/s. B: Sample responses depicting quantal exocytosis from individual bovine chromaffin cells stimulated with a high K⁺ solution. Differences in the size or time course of these sample amperometric spikes do not necessarily represent consistent differences among electrode materials.