Atmospheric-pressure microplasma in dielectrophoresis-driven bubbles for optical emission spectroscopy

Shih Kang Fan*, Yan Ting Shen, Ling Pin Tsai, Cheng Che Hsu, Fu-Hsiang Ko, Yu-Ting Cheng

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


The manipulation of bubbles and the ignition of microplasma within a 200 nL bubble at atmospheric pressure and in an inert silicone oil environment were achieved. Driven by dielectrophoresis (DEP), bubble generation, transportation, mixing, splitting, and expelling were demonstrated. This process facilitated the preparation of various bubbles with tuneable gas compositions. Different gas bubbles, including air, argon (Ar), helium (He), and Ar/He mixtures, were manipulated and ignited to the plasma state by dielectric barrier discharge (DBD) within a 50 μm-high gap between parallel plates. Moving and splitting the atmospheric-pressure microplasma in different gas bubbles were achieved by DEP. The excited light of the microplasma was recorded by an optical spectrometer for the optical emission spectroscopy (OES) analyses. The characteristic peaks of air, Ar, and He were observed in the DEP-driven microplasma. With the capability to manipulate bubbles and microplasma, this platform could be used for gas analyses in the future.

Original languageEnglish
Pages (from-to)3694-3699
Number of pages6
JournalLab on a Chip
Issue number19
StatePublished - 7 Oct 2012

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