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Laser-induced hierarchical carbon patterns on polyimide substrates for flexible urea sensors

Mamleyev, Emil R.; Heissler, Stefan; Nefedov, Alexei; Weidler, Peter G.; Nordin, Nurdiana; Kudryashov, Vladislav V.; Länge, Kerstin; MacKinnon, Neil; Sharma, Swati

Abstract:
Thermochemical decomposition of organic materials under heat-treatment in the absence of oxygen, known as the pyrolysis process, is often employed to convert micro and nano patterned polymers into carbon structures, which are subsequently used as device components. Pyrolysis is performed at ≥900 °C, which entails substrate materials with a high thermal stability that excludes flexible, polymeric substrates. We use optimized laser radiation to pattern graphitic carbon structures onto commercially available polyimide (Kapton) sheets in the micrometer to millimeter scale by inducing a localized, rapid pyrolysis, for the fabrication of flexible devices. Resulting laser carbon films are electrically conductive and exhibit a high-surface area with a hierarchical porosity distribution along their cross-section. The material is obtained using various combinations of laser parameters and pyrolysis environment (oxygen-containing and inert). Extensive characterization of laser carbon is performed to understand the correlation between the material properties and laser parameters, primarily fluence and power. A photothermal carbonization mechanism based on the plume formation is proposed. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000089342
Veröffentlicht am 11.01.2019
Originalveröffentlichung
DOI: 10.1038/s41528-018-0047-8
Coverbild
Zugehörige Institution(en) am KIT Institut für Mikrostrukturtechnik (IMT)
Institut für Funktionelle Grenzflächen (IFG)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 2397-4621
urn:nbn:de:swb:90-893422
KITopen-ID: 1000089342
HGF-Programm 43.21.03 (POF III, LK 01)
Erschienen in npj flexible electronics
Band 3
Heft 1
Seiten Article no 2
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Vorab online veröffentlicht am 10.01.2019
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