SKM 2023 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 41: Biopolymers, Biomaterials and Bioinspired Functional Materials II (joint session CPP/BP)

CPP 41.1: Talk

Wednesday, March 29, 2023, 16:30–16:45, MER 02

Low-Temperature and Water-Based Biotemplating of Nanostructured Foam-Like Titania Films using ß-Lactoglobulin — •Julian E. Heger¹, Wei Chen¹, Shanshan Yin¹, Nian Li¹, Volker Körstgens¹, Calvin J. Brett^2,3, Wiebke Ohm², Stephan V. Roth^2,3, and Peter Müller-Buschbaum^1,4 — ¹TUM School of Natural Sciences, Chair for Functional Materials, Garching, Germany — ²DESY, Hamburg, Germany — ³Royal Institute of Technology KTH, Stockholm, Sweden — ⁴MLZ, TUM, Garching, Germany

Energy-related applications such as solar cells, batteries, and the photocatalytic production of hydrogen are broadly built up on titania nanostructures. A tailored titania morphology is necessary to match the required charge diffusion lengths and the crystallinity beneficial for efficient performance. In the context of large-scale fabrication, the aspect of sustainability becomes essential. Biopolymer templating based on ß-Lactogobulin (ß-lg) and spray deposition promotes low-temperature and water-based synthesis of nanostructured, crystalline, foam-like titania films. During spray deposition, the ß-lg biopolymer matrix sterically directs the titania morphology. Afterwards, the biotemplate is removed by UV-light exposure. To understand the kinetics of film formation during the spray deposition on the nano and crystalline length scale, we simultaneously perform in situ grazing-incidence small-angle and wide-angle X-ray scattering (GISAXS/GIWAXS). Together with scanning electron microscopy (SEM), the results explain the role of ß-lg as a biotemplate.