Imaging of carbon nanomembranes with helium ion microscopy

• André Beyer,
• Henning Vieker,
• Robin Klett,
• Hanno Meyer zu Theenhausen,
• Polina Angelova and
• Armin Gölzhäuser

Beilstein J. Nanotechnol. 2015, 6, 1712–1720, doi:10.3762/bjnano.6.175

• (CNMs) prepared from aromatic self-assembled monolayers constitute a recently developed class of 2D materials. They are made by a combination of self-assembly, radiation-induced cross-linking and the detachment of the cross-linked SAM from its substrate. CNMs can be deposited on arbitrary substrates

• recording the emitted secondary electrons generates the HIM images. The advantages of HIM are high resolution, high surface sensitivity and large depth of field. The effects of sample charging, imaging of multilayer CNMs as well as imaging artefacts are discussed. Keywords: 2D materials; carbon

• hexagonal boron nitride (h-BN), an insulating material that shares similarities with graphene, were imaged in a comparative study [23]. Therein, it is shown that HIM is more sensitive and consistent than SEM for characterizing the number of layers and the morphology of 2D materials. It was also shown that

Two-dimensional and tubular structures of misfit compounds: Structural and electronic properties

• Tommy Lorenz,
• Jan-Ole Joswig and
• Gotthard Seifert

Beilstein J. Nanotechnol. 2014, 5, 2171–2178, doi:10.3762/bjnano.5.226

• or more layers of these sheets results in a so-called misfit layer compound (MLC) [1][2], in which the difference in the compound layers leads to different effects. Figure 1a demonstrates the misfit-compound concept schematically: two different layered, 2D materials are stacked alternately in

• -dimensional (2D) materials gave access to the preparation of numerous misfit compounds. To date, three comprehensive reviews have dealt with planar [3][4] and tubular [6] misfit compounds, which were as well the foundation for the present overview. In the following, planar and tubular misfit structures are

Fabrication of carbon nanomembranes by helium ion beam lithography

• Xianghui Zhang,
• Henning Vieker,
• André Beyer and
• Armin Gölzhäuser

Beilstein J. Nanotechnol. 2014, 5, 188–194, doi:10.3762/bjnano.5.20

• attachment; helium ion microscopy; ion beam-organic molecules interactions; self-assembled monolayers; Introduction Carbon nanomembranes (CNMs) with monomolecular thickness and macroscopic lateral size represent a new type of functional two-dimensional (2D) materials [1]. A universal scheme to fabricate