Fabrication of high aspect ratio insulating nozzle using glass reflow process and its electrohydrodynamic printing characteristics

We apply a glass reflow process to fabricate tiny glass nozzles with inner diameter of 20 microns and with a height of 150 microns which is impossible to achieve with a conventional etching process. Due to the enhanced aspect ratio of the nozzle, we observe better printing performances such as narrow line width below 10 microns and anti-wetting of ink around a nozzle. High frequency drop jetting up to 10 kHz is observed by applying high voltage pulse signals on ink inside the nozzle. Silver particle ink is also printed well and continuous line patterns are fabricated.