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Carbon Materials With Conductivity Gradients Allow Dynamic Screening of Steep Temperature Differences Along Thin Films

Title data

Berger, Alexander ; Schöttle, Marius ; Lebeda, Flora ; Schmalz, Holger ; Bösecke, Peter ; Rosenfeldt, Sabine ; Greiner, Andreas ; Retsch, Markus:
Carbon Materials With Conductivity Gradients Allow Dynamic Screening of Steep Temperature Differences Along Thin Films.
In: Advanced Functional Materials. Vol. 34 (2024) Issue 45 . - 2400740.
ISSN 1616-3028
DOI: https://doi.org/10.1002/adfm.202400740

Official URL: Volltext

Project information

Project title:
Project's official title
Project's id
CRC 1585 "MultiTrans" - Project C05
492723217

Project financing: Deutsche Forschungsgemeinschaft

Abstract in another language

Carbon materials comprise a wide range of microstructures and excellent electrical and thermal properties while being cost-effective and readily available. They can be obtained through carbothermal processes at high temperatures, starting from cellulose. Catalytically active compounds, for example, iron salts, strongly influence the carbon microstructure during the graphitization process. Different degrees of structural order can, therefore, be achieved by adjusting the concentration of the iron salts. An infusion withdrawal impregnation approach is used on filter paper to prepare a continuous gradient of the carbon microstructure. This structural change is accompanied by a continuous variation of the closely related electrical and thermal transport properties. Even more, the synergistic interplay of local sheet resistance and thermal diffusivity results in the formation of switchable temperature gradients when an external current is applied. Steady state temperature differences of up to 80 °C are observed along the centimeter-scaled samples. The controllable temperature gradient formation will be of great interest for applications requiring a fast temperature screening. Furthermore, the temperature gradient can be imposed onto other materials, which will be particularly relevant for advanced thin film characterization applications.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: catalytic graphitization; carbon microstructure; electron transport; heattransport; infusion withdrawal coating
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Physical Chemistry I - Kolloidale Strukturen und Energiematerialien > Chair Physical Chemistry I- Kolloidale Strukturen und Energiematerialien - Univ.-Prof. Dr. Markus Retsch
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II > Chair Macromolecular Chemistry II - Univ.-Prof. Dr. Andreas Greiner
Research Institutions > Central research institutes > Bayreuth Center for Colloids and Interfaces - BZKG
Research Institutions > Central research institutes > Bayerisches Zentrum für Batterietechnik - BayBatt
Research Institutions > Affiliated Institutes > Bavarian Polymer Institute (BPI)
Research Institutions > Collaborative Research Centers, Research Unit > SFB 1585 - MultiTrans – Structured functional materials for multiple transport in nanoscale confinements
Graduate Schools > University of Bayreuth Graduate School
Graduate Schools > Elite Network Bavaria > Macromolecular Science
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Physical Chemistry I - Kolloidale Strukturen und Energiematerialien
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry II
Research Institutions
Research Institutions > Central research institutes
Research Institutions > Affiliated Institutes
Research Institutions > Collaborative Research Centers, Research Unit
Graduate Schools
Graduate Schools > Elite Network Bavaria
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
Date Deposited: 01 Oct 2024 09:33
Last Modified: 03 Dec 2024 12:50
URI: https://eref.uni-bayreuth.de/id/eprint/90508