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Self-Limiting Electrospray Deposition on Polymer Templates

preprint
submitted on 28.07.2020 and posted on 29.07.2020 by Lin Lei, Arielle R. Gamboa, Christianna Kutznetsova, Sunshine Littlecreek, Jingren Wang, Qingze Zou, Jeffrey Zahn, Jonathan Singer

Electrospray deposition (ESD) applies a high voltage to liquids flowing through narrow capillaries to produce monodisperse generations of droplets down to hundreds of nanometers in diameter, each carrying a small amount of the delivered solute. This deposition method has been combined with insulated stencil masks for fabricating micropatterns by spraying solutions containing nanoparticles, polymers, or biomaterials. To optimize the fabrication process for micro-coatings, a self-limiting electrospray deposition (SLED) method has recently been developed. Here, we combine SLED with a pre-existing patterned polymer film to study SLED’s fundamental behavior in a bilayer geometry. SLED has been observed when glassy insulating materials are sprayed onto conductive substrates, where a thickness-limited film forms as charge accumulates and repels the arrival of additional charged droplets. In this study, polystyrene (PS), Parylene C, and SU-8 thin films of varying thickness on silicon are utilized as insulated spraying substrates. Polyvinylpyrrolidone (PVP), a thermoplastic polymer is sprayed below its glass transition temperature (Tg) to investigate the SLED behavior on the pre-deposited insulating films. Furthermore, to examine the effects of in-plane confinement on the spray, a microhole array patterned onto the PS thin film by laser dewetting was sprayed with dyed PVP in the SLED mode. This was then extended to an unmasked electrode array showing that masked SLED and laser dewetting could be used to target microscale regions of conventionally patterned electronics.

Funding

National Science Foundation Award #1911518

New Jersey Space Grant Consortium

3M Non-Tenured Faculty Award

History

Email Address of Submitting Author

jonathan.singer@rutgers.edu

Institution

Rutgers University

Country

United States

ORCID For Submitting Author

0000-0002-5934-8795

Declaration of Conflict of Interest

No conflict of interest.

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