Berlin 2024 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 3: Crystallization, Nucleation and Self-Assembly I

CPP 3.5: Vortrag

Montag, 18. März 2024, 10:45–11:00, H 0110

Infrared Scanning Near-Field Spectroscopic Studies of Self-Assembled Nanostructures Based on Photo-Crosslinkable Block Copolymers — •Nadine von Coelln¹, Britta Weidinger², Christian Huck¹, Irene Wacker³, Ronald Curticean³, Rasmus R. Schröder³, Eva Blasco², and Petra Tegeder¹ — ¹Institute for Physical Chemistry, Heidelberg University, Germany — ²IMSEAM, Heidelberg University, Germany — ³BioQuant, Heidelberg University, Germany

Block copolymers, are materials known for their ability to self-assemble into a variety of morphologies on the nanometer scale. The self-assembly of block copolymers has been extensively investigated for 2D thin films, however, less attention has been paid to 3D bulk morphologies. In this work, long-range ordered 3D bulk morphologies of a well-defined diblock copolymer consisting of polystyrene and a methacrylate-based copolymer decorated with photo-crosslinkable units were prepared via solvent annealing. The internal lamellar or cylindrical nanostructures are studied based on infrared scanning near-field optical microscopy (IR-SNOM), which offers the unique possibility of infrared chemical imaging and spectroscopy with a spatial resolution down to around 20 nm. We demonstrate that by irradiation at an independently addressable absorption band of a polymer block, it is possible to chemically image the blocks' nano-ordered spatial arrangement. By changing which polymer block is excited, a switch of the relative optical phase, related to the local absorption, is observed, revealing a strong phase segregation via spectroscopic contrast.

Keywords: Scanning-Probe Microscopy; Near-Field; Infrared; Block Copolymer; Self-Assembly