Abstract
Micrometer-scale bubbles have been successfully generated by electrolysis with using carbon nanotubes (CNTs) as the electrode. The CNTs used were vertically aligned on a conductive silicon wafer. After wiring the substrate connecting to the CNTs, it was placed in NaOH solution. The CNTs were covered by air film because of hydrophobicity, however it gradually disappeared as applying voltage. It is probably originated in increasing buoyancy since bubbles are newly generated on individual CNTs. Then innumerable bubbles with 10 micrometer diameter were observed at the tips of CNTs after continuous electrolysis. This result may lead us to develop a novel technique to manipulate a single microbubble with a selective diameter by trapping at a tip of a CNT prove.
