Plasma column and nano-powder generation from solid titanium by localized microwaves in air

Simona Popescu, Eli Jerby*, Yehuda Meir, Zahava Barkay, Dana Ashkenazi, J. Brian A. Mitchell, Jean Luc Le Garrec, Theyencheri Narayanan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


This paper studies the effect of a plasma column ejected from solid titanium by localized microwaves in an ambient air atmosphere. Nanoparticles of titanium dioxide (titania) are found to be directly synthesized in this plasma column maintained by the microwave energy in the cavity. The process is initiated by a hotspot induced by localized microwaves, which melts the titanium substrate locally. The molten hotspot emits ionized titanium vapors continuously into the stable plasma column, which may last for more than a minute duration. The characterization of the dusty plasma obtained is performed in-situ by small-angle X-ray scattering (SAXS), optical spectroscopy, and microwave reflection analyses. The deposited titania nanoparticles are structurally and morphologically analyzed by ex-situ optical and scanning-electron microscope observations, and also by X-ray diffraction. Using the Boltzmann plot method combined with the SAXS results, the electron temperature and density in the dusty plasma are estimated as ∼0.4 eV and ∼1019m-3, respectively. The analysis of the plasma product reveals nanoparticles of titania in crystalline phases of anatase, brookite, and rutile. These are spatially arranged in various spherical, cubic, lamellar, and network forms. Several applications are considered for this process of titania nano-powder production.

Original languageEnglish
Article number023302
JournalJournal of Applied Physics
Issue number2
StatePublished - 14 Jul 2015


Dive into the research topics of 'Plasma column and nano-powder generation from solid titanium by localized microwaves in air'. Together they form a unique fingerprint.

Cite this