Recent and forthcoming publications in pss

Strained graphene as a local probe for plasmon-enhanced Raman scattering by gold nanostructures

Sebastian Heeg, Antonios Oikonomou, Roberto Fernandez Garcia, Stefan A. Maier, Aravind Vijayaraghavan, and Stephanie Reich

In this Letter, the authors establish the general use of strained graphene as local probes for plasmonic nanostructures (and vice versa) as seen by surface-enhanced Raman spectroscopy. Structures with plasmonic cavities, where enhanced light fields are compressed into sub-wavelength volumes, are particularly suitable to be characterized by this approach. A resolution well below the diffraction limit is achieved.

Phys. Status Solidi RRL (2013) DOI 10.1002∕pssr.201308145.


Doping of bi-layer graphene by gradually polarizing a ferroelectric polymer

Martin Kalbac, Jing Kong, and Mildred S. Dresselhaus

Previous reports on the electrochemical doping of graphene left many open questions; in particular how the electrolyte anions interact with graphene or whether the electrolyte ions penetrate into graphene layers during the doping. To answer these questions Kalbac et al. probed the Raman spectra of two-layer graphene (2-LG), where one graphene layer was of natural 12C isotope composition and the second graphene layer was labeled by the 13C isotope. The authors studied the 2-LG both in its neutral and doped states, which were realized using a polarization of a ferroelectric polymer, and they analyzed the changes in Raman intensity and frequency of the G and G' modes during electrochemical charging.

Phys. Status Solidi B (2013) DOI 10.1002∕pssb.201300053.


Magnetic force microscopy study of shape engineered FEBID iron nanostructures

Marco Gavagnin, Heinz D. Wanzenboeck, Domagoj Belic, Mostafa M. Shawrav, Anders Persson, Klas Gunnarsson, Peter Svedlindh, and Emmerich Bertagnolli

The capability to control matter down to the nanoscale in combination with the novel magnetic properties of nanomaterials have attracted increasing attention in the last few decades. Many efforts have been devoted to the characterization of magnetic nanoelements. In this study Fe-based nanostructures have been synthesized on Si(100) by focused electron beam induced deposition (FEBID) utilizing iron pentacarbonyl as precursor. The so obtained nanostructures exhibit a remarkably high iron content, expected to give rise to a ferromagnetic behaviour. For that reason, magnetic force microscopy (MFM) analyses were performed on the obtained FEBID Fe nanostructures. Moreover, simulations have been executed to study the influence of the geometry on the magnetic properties of iron single-domain nanowires.

Phys. Status Solidi A (2013) DOI 10.1002∕pssa.201330114.