Browsing by Author "Wang, D."

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    Direct writing of lead zirconate titanate piezoelectric structures by electrohydrodynamic atomisation.
    (Springer Science Business Media, 2007-12-01T00:00:00Z) Rocks, Sophie A.; Wang, D.; Sun, D.; Jayasinghe, S. N.; Edirisinghe, M. J.; Dorey, Robert A.
    Direct writing, consisting of the directed deposition of individual droplets of ceramic suspension using ink jet printing can be used to produce piezoelectric structures with feature sizes in excess of 100 μm. This work presents an alternative direct writing technique, consisting of directed individual droplets produced by electrohydrodynamic atomisation (EHDA), where feature sizes an order of magnitude smaller can be achieved. This technique opens up the possibility of using direct writing technology to produce integrated MEMS devices. Low toxicity lead zirconate titantate (PZT) sol has been used in conjunction with the EHDA process to produce isolated features and lines with dimensions as small as 20 μm. These features, when fired, form the perovskite PZT crystal structure. Using an X–Y stage to move the sample, it is possible to create a variety of structu
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    Electrohydrodynamic jet printing of PZT thick film micro-scale structures
    (Elsevier, 2015-06-08) Wang, D.; Zhu, X.; Liang, J-S; Ren, T.; Zha, W.; Dong, W.; Rocks, Sophie A.; Dorey, Robert A.; Xu, Z.; Wang, X.
    This paper reports the use of a printing technique, called electrohydrodynamic jet printing, for producing PZT thick film micro-scale structures without additional material removing processes. The PZT powder was ball-milled and the effect of milling time on the particle size was examined. This ball-milling process can significantly reduce the PZT particle size and help to prepare stable composite slurry suitable for the E-Jet printing. The PZT micro-scale structures with different features were produced. The PZT lines with different widths and separations were fabricated through the control of the E-Jet printing parameters. The widths of the PZT lines were varied from 80 μm to 200 μm and the separations were changed from 5 μm to 200 μm. In addition, PZT walled structures were obtained by multi-layer E-Jet printing. The E-Jet printed PZT thick films exhibited a relative permittivity (ɛr) of ∼233 and a piezoelectric constant (d33, f) of ∼66 pC N−1.