Surface conductivity dependent dynamic behaviour of an ultrafine atmospheric pressure plasma jet for microscale surface processing

Tomy Abuzairi, Mitsuru Okada, Sudeep Bhattacharjee, Masaaki Nagatsu

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)

Abstract

An experimental study on the dynamic behaviour of microcapillary atmospheric pressure plasma jets (APPJs) with 5 μm tip size for surfaces of different conductivity is reported. Electrical and spatio-temporal characteristics of the APPJs are monitored using high voltage probe, current monitor and high speed intensified charge couple device camera. From these experimental results, we presented a simple model to understand the electrical discharge characteristics of the capillary APPJs with double electrodes, and estimated the velocity of the ionization fronts in the jet and the electron density to be 3.5–4.2 km/s and 2–7 × 10 17  m −3 . By analyzing the dynamics of the microcapillary APPJs for different substrate materials, it was found that the surface irradiation area strongly depended on the substrate conductivity and permittivity, especially in the case of polymer-like substrate, surface irradiation area was significantly broadened probably due to the repelling behaviour of the plasma jets from the accumulated electrical charges on the polymer surface. The effect of applying a substrate bias in the range from −900 V to +900 V on the plasma irradiation onto the substrates was also investigated. From the knowledge of the present results, it is helpful for choosing the substrate materials for microscale surface modification.

Original languageEnglish
Pages (from-to)489-496
Number of pages8
JournalApplied Surface Science
Volume390
DOIs
Publication statusPublished - 30 Dec 2016

Keywords

  • Dynamic behaviour
  • ICCD image
  • Microcapillary
  • Substrate materials
  • Surface modification
  • Ultrafine atmospheric pressure plasma jet

Fingerprint

Dive into the research topics of 'Surface conductivity dependent dynamic behaviour of an ultrafine atmospheric pressure plasma jet for microscale surface processing'. Together they form a unique fingerprint.

Cite this