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DS: Fachverband Dünne Schichten

DS 27: Micro- and Nanopatterning

DS 27.4: Talk

Wednesday, March 18, 2015, 15:45–16:00, H 0111

Alternate Multi-Polymer Nano Droplet Array on Topographically Structured Surfaces — Nandini Bhandaru, Anuja Das, Namrata Salunke, and •Rabibrata Mukherjee — Indian Institute of Technology Kharagpur, Kharagpur, India

Submicron scale surface morphologies comprising of ordered multi-material domains find various applications in fabrication of multifunctional coatings, development of exotic metamaterials, high resolution microscopy etc., but these structures are still scientifically more challenging to fabricate. We have developed a novel method for creating alternate equi-sized binary polymer nano domains using sequential spin dewetting of polymethylmethacrylate (PMMA) and polystyrene (PS) solutions on topographically patterned substrates. Polymer solutions with concentrations as low as 0.1% (w/v) when spin coated over a non wettable substrate undergoes in-situ de-wetting during the coating process itself, by a phenomenon also known as Spin De-wetting. This phenomena, along with intermediate substrate silanizaton with octadecyl-trichloro-silane (OTS) results in a multi material droplet array. The formation takes place for range of solution concentration of both polymers and on a variety of substrate geometry leading to creation of a multifunctional surface.