Dr. Andrey Turchanin

Fakultät für Physik, Universität Bielefeld 

 

Abstract

Free-standing 2D materials differ from thin films in that they exist as isolated forms at some critical stage in their growth or processing, or after their integration into devices. In this talk it will be demonstrated how monolayers of aromatic molecules can be tailored to form atomically or molecular thin free-standing 2D carbon materials. By electron or photon irradiation these organic monolayers are converted into carbon nanomembranes (CNMs) with a thickness of one molecule, which can be tuned from ~0.5 to 3 nm. CNMs possess high mechanical stability and can be separated from their original substrates and transferred onto various other substrates, or stacked into multilayer films with precise control over their thickness and well-defined interlayer boundaries. By annealing CNMs in vacuum or at atmospheric pressure they are converted into graphene. The developed approach makes possible both scalable production of high-electronic-quality graphene or CNMs and their direct growth in various tailored shapes. Layer-by-layer assembly of CNM/graphene heterostructures opens many doors to the engineering of novel nanomaterials for electronics, optics, biofunctional coatings and sensors. Their physical and chemical properties characterized by state-of-the-art microscopy, spectroscopy, electric and magnetoelectric transport measurements, their nanopatterning and device applications will be presented.

 

References

[1] D. G. Matei et al.: Functional single-layer graphene sheets from aromatic monolayers, Adv. Mater. 25 (2013) 4146-4151, 

[2] P. Angelova et al.: A universal scheme to convert aromatic molecular monolayers into functional carbon nanomembranes. ACS Nano 7 (2013) 6489-6421.

[3] A. Turchanin and A. Gölzhäuser: Carbon nanomembranes from self-assembled monolayers: Functional surfaces without bulk. Prog. Surf. Sci. 87 (2012) 108-162.

[4] A. Turchanin et al.: Conversion of self-assembled monolayers into nanocrystalline graphene: structure and electric transport. ACS Nano 5 (2011) 3896-3904.

[5] C.T. Nottbohm et al.: Mechanically stacked 1 nm thick carbon nanosheets: Ultrathin layered materials with tunable optical, chemical, structural and electrical properties, Small 7 (2011) 874-883.

[6] Z. Zheng et al.: Janus nanomembranes: A generic platform for chemistry in two dimensions, 

Angew. Chem. Int. Ed. 49 (2010) 8493-8497.

[7] A. Beyer et al.:  Fabrication of metal patterns on free-standing graphenoid nanomembranes, J. Vac. Sci. Technol. B 26 (2010) C6D6-C6D10. 

[8] A. Turchanin et al.: One nanometer thin carbon nanosheets with tunable conductivity and stiffness. Adv. Mater. 21 (2009) 1233-1237.