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 Karl Franzens University Graz

Graz University of Technology 

Polymer Films, Structures, and Devices by Initiated and Oxidative Chemical Vapor Deposition
Kenneth K. S. Lau
Department of Chemical and Biological Engineering, Drexel University
16:15 - 17:15 Tuesday 08 June 2021 TUG - Online

Video: https://1513041.mediaspace.kaltura.com/media/TU+Graz+-+Colloquium+Talk/1_f86g9afn

Chemical vapor deposition (CVD) is a non-conventional route for constructing polymers as thin films, non-planar structures, and integrated devices. Polymer thin films are conventionally formed through liquid phase processing, like dip coating, spray coating and spin casting. Likewise, polymer patterns, structures, and devices are typically built through an intricate series of liquid-based processing steps that includes lithography and printing. However, as future generations of materials and applications keep pushing towards light-weight polymers and smaller scale, whether to increase device density, reduce footprint or enable flexible platforms, CVD is a promising processing route that overcomes many of the shortcomings of liquid-based approaches, such as liquid surface tension, poor surface wettability, substrate corrosion and solvent residue. Overcoming these challenges are expected to lead to better material, surface/structural, and device properties.

This talk will highlight two specific CVD approaches: initiated and oxidative chemical vapor deposition (iCVD and oCVD). iCVD relies on polymerization initiators to enable chemical conversion of monomer reactant to the corresponding long-chain polymer, such as acrylates, ethers, siloxanes and fluoropolymers. oCVD relies on oxidants to enable simultaneous polymerization and oxidation of the monomer into electrically conducting polymers, such as thiophenes, pyrroles and anilines. Specifically, this talk will discuss our efforts in understanding the underpinning physical and chemical factors that control polymer evolution. These insights will be discussed in the context of enabling a range of applications in area-selective deposition, liquid repellency, healthcare, and energy. Overall, these demonstrations aim to illustrate the strengths of iCVD and oCVD as they continue to push the bounds on material, surface/structural, and device performance.

The video is available at https://1513041.mediaspace.kaltura.com/media/TU+Graz+-+Colloquium+Talk/1_f86g9afn.