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O: Fachverband Oberflächenphysik

O 113: Thin Films, Nanostructures and Nanoparticles II

O 113.4: Vortrag

Freitag, 24. März 2017, 11:00–11:15, ZEU 114

Pyrolysis of carbon nanomembranes studied by gas permeation measurements — •André Beyer, Nils Klement, Riko Korzetz, Xianghui Zhang, Berthold Völkel, and Armin Gölzhäuser — Physics of Supramolecular Systems and Surfaces, Bielefeld University, 33615 Bielefeld, Germany

Carbon nanomembranes (CNMs) from aromatic self-assembled monolayers are made by electron exposure of the molecular monolayers, resulting in cross-linked membranes which are 1 nm thick and exhibit molecular sieving characteristics in gas permeation experiments [1]. Annealing at 1200 K in vacuum transforms CNMs into nanocrystalline graphene [2, 3]. Here, this transformation process is studied by gas permeation measurements of CNMs after annealing at different intermediate temperatures in the range between 600 K and 900 K. To this end, CNMs were placed onto polydimethylsiloxane (PDMS) membranes after completion of the annealing process to determine their gas permeation characteristics with different gases (He, Ne, CO₂, Ar, Kr, N₂). A resistance model is employed to discriminate the permeation characteristics of the annealed CNMs from the PDMS support membranes [1]. It is found that a major part of the transformation process occurs at temperatures between 670 K and 770 K.

[1] M. Ai et al., Adv. Mater. 26 (2014) 3421.

[2] A. Turchanin et al., Adv. Mater. 21 (2009) 1233.

[3] A.Turchanin, et al., ACS Nano 5 (2011) 3896.