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In this paper, we present a large-volume (non-micro) atmospheric pressure glow plasma capable of rapid, large-scale zinc oxide nanocrystal synthesis and deposition (up to 400 μg/min), whereas in the majority of the literature, nanoparticles are synthesized using micro-scale or filamentary plasmas. The reactor is an RF dielectric barrier discharge with a non-uniform gap spacing. This design encourages pre-ionization during the plasma breakdown, making the discharge uniform over a large volume. The produced zinc oxide nanocrystals typically have diameters ranging from 4 to 15 nm and exhibit photoluminescence at ≈550 nm and localized surface plasmon resonance at ≈1900 cm-1 due to oxygen vacancies. The particle size can be tuned to a degree by varying the gas temperature and the precursor mixing ratio.
Bibliographical noteFunding Information:
N.B. was supported in part by the DOE Plasma Science Center and the Doctoral Dissertation Fellowship from the University of Minnesota. B.L.G. was supported by NSF through MRSEC Grant No. DMR-1420013. J.Y. acknowledges the support by the Army Office of Research under MURI Grant No. W911NF-12-1-0407. Part of this work was carried out in the Characterization Facility, University of Minnesota, which receives partial support from NSF through the MRSEC program. The authors would like to thank Juyong Jang for his contribution to the reactor design and construction, and Yunxiang Qin for performing scanning electron microscope measurements on the nanocrystal deposits.
© 2016 Author(s).
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