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Title: Geometric confinement of directly deposited features on hydrophilic rough surfaces using a sacrificial layer
Authors: Liu, L.
Wang, X.
Lennon, A.
Hoex, B. 
Issue Date: 2014
Citation: Liu, L., Wang, X., Lennon, A., Hoex, B. (2014). Geometric confinement of directly deposited features on hydrophilic rough surfaces using a sacrificial layer. Journal of Materials Science 49 (12) : 4363-4370. ScholarBank@NUS Repository.
Abstract: It is challenging to achieve high definition for inkjet-printed features on hydrophilic rough surfaces. In this study, a spreading diameter of ~5 mm was observed for a 10 pL inkjet droplet when it impacted onto a hydrophilic rough surface. A new geometric confinement method was employed to facilitate a much higher inkjet printing definition in the range of ~50 μm. A layer of water-soluble polyacrylic acid (PAA) was spin-coated onto a hydrophilic rough surface and then inkjet patterned. Subsequently, the PAA was made water-insoluble by subjecting the sample to a heat treatment with temperatures above 170 °C. The change in solubility of PAA during the heat treatment is found to be a crucial factor, which enables the physical confinement of the subsequently inkjet printed aqueous-based droplets. The thickness of the spin-coated sample also plays a critical role in the effectiveness of the physical confinement. The effectiveness of the proposed approach was demonstrated with an inkjet patterning process, in which a dielectric layer of 200 nm SiN x on a textured silicon wafer was selectively etched using 10 pL inkjet-printed droplets resulting in a line width of ~75 μm. When using a 1 pL printhead, the etched line width was as fine as ~30 μm. © 2014 Springer Science+Business Media New York.
Source Title: Journal of Materials Science
ISSN: 15734803
DOI: 10.1007/s10853-014-8135-1
Appears in Collections:Staff Publications

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