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Shin, Ho Sun,Hamdou, Bacel,Reith, Heiko,Osterhage, Hermann,Gooth, Johannes,Damm, Christine,Rellinghaus, Bernd,Pippel, Eckhard,Nielsch, Kornelius The Royal Society of Chemistry 2016 Nanoscale Vol.8 No.28
<P>We systematically investigated the role of topological surface states on thermoelectric transport by varying the surface-to-volume ratio (s/v) of Bi2Se3 nanowires. The thermoelectric coefficients of Bi2Se3 nanowires were significantly influenced by the topological surface states with increasing the s/v. The Seebeck coefficient of Bi2Se3 nanowires decreased with increasing the s/v, while the electrical conductivity increased with increasing the s/v. This implies that the influence of metallic surface states become dominant in thermoelectric transport in thin nanowires, and the s/v is a key parameter which determines the total thermoelectric properties. Our measurements were corroborated by using a two-channel Boltzmann transport model.</P>
Graphene Coatings for the Mitigation of Electron Stimulated Desorption and Fullerene Cap Formation
Bachmatiuk, Alicja,Dianat, Arezoo,Ortmann, Frank,Quang, Huy Ta,Cichocka, Magdalena Ola,Gonzalez-Martinez, Ignacio,Fu, Lei,Rellinghaus, Bernd,Eckert, Joergen,Cuniberti, Gianaurelio,Rü,mmeli, Mark American Chemical Society 2014 Chemistry of materials Vol.26 No.17
<P>Graphene already has numerous applications in transmission electron microscopy. Here, we extend its application in electron microscopy by demonstrating its potential to stop electron induced desorption in nonconducting samples, where in essence charge build-up leads to surface atom desorption. Graphene films provide a conduction pathway to prevent charge build-up and do not interfere with the imaging process allowing the direct imaging of specimens sensitive to electron induced desorption. We also show that small graphene flakes on the surface of MgO transform to fullerenes or hemispherical fullerenes. The hemispherical fullerenes anchor to the MgO surface and are of particular interest as they suggest it should be possible to nucleate single walled carbon nanotubes on the surface of oxide supports without the need of a catalyst particle.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/cmatex/2014/cmatex.2014.26.issue-17/cm502043x/production/images/medium/cm-2014-02043x_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/cm502043x'>ACS Electronic Supporting Info</A></P>