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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 26: French-German Session: 2D Materials, Thin Films and Interfaces II
CPP 26.1: Hauptvortrag
Dienstag, 10. März 2026, 14:00–14:30, HÜL/S386
Investigating lignin graphitisation depending on botanical source and extraction method — Lucie Dieval1, Phuthiphong Ouitrakoon2, Robert Hunter2, Sébastien Schaefer3, Louis Hennet3, Erik Elkaim4, Julie Ruellou5, Milo S. P. Shaffer2, Agnieszka Brandt-Talbot2, and •Pascale Launois1 — 1LPS, CNRS/Université Paris Saclay, France — 2Imperial College, UK — 3ICMN, CNRS/University of Orléans, France — 4Synchrotron SOLEIL, France — 5ESRF, France
Lignins, plant-derived macromolecules, are promising carbon sources from a sustainable development perspective. Here, we study the transformations of various lignins into turbostratic carbon or graphite, consisting of stacked graphene sheets.
The lignin powders were heated at temperatures between 1000 and 2730°C. Analyses were performed ex-situ using X-ray scattering (XRS) and Raman spectroscopy, which confirmed XRS results. XRS data were analysed combining analyses in reciprocal space and in direct space with Pair Distribution Function. The dimensions of the carbonaceous crystalline domains formed from lignins are determined as a function of temperature, as well as the stacking mode of their graphene sheets. We find that all studied lignins transform into turbostratic carbon, with no evidence for intermediate stackings towards graphite. Different sizes of crystalline domains are evidenced depending on the lignin form. One lignin presents relatively large sizes both for the graphene layers and in the stacking direction at a temperature as low as 1300°C, a most promising finding for future applications.
Keywords: lignin; carbon; graphene; X-ray scattering; Raman spectroscopy