Fig. 3: Effect of plasma direct-writing parameters on the oxygen concentration.
From: Microplasma direct writing for site-selective surface functionalization of carbon microelectrodes
a FESEM and EDS elemental mapping of O over increasing exposure. Atomic percentage of oxygen and atomic C/O ratio over b various plasma direct-writing repetitions at a 1-mm tungsten electrode tip to the carbon surface distance and c various electrode tips to surface distances at 200 writing repetitions (N = 3–6)
