Nanomechanics of individual aerographite tetrapods

R.A., O.L. and K.S. would like to thank the German Research Foundation (DFG) for the financial support under schemes AD 183/17-1 and SFB 986-TP-B1, respectively, and the Graphene FET Flagship. R.M. and D.E. would like to thank for financial support from Latvian Council of Science, no. 549/2012. N.M.P. is supported by the European Research Council (ERC PoC 2015 SILKENE no. 693670) and by the European Commission H2020 under the Graphene Flagship (WP14 ‘Polymer Composites’, no. 696656) and under the FET Proactive (‘Neurofibres’ no. 732344). S.S. acknowledges support from SILKENE

High-density horizontally aligned growth of carbon nanotubes with Co nanoparticles deposited by arc-discharge plasma method

High-density horizontally aligned single-walled carbon nanotubes are grown on a quartz substrate using Co nanoparticles deposited by arc-discharge plasma method. The Co nanoparticles with a density as high as 6.0×10^10 cm^{−2} are formed by a single pulse of arc discharge at room temperature. The density of the aligned nanotubes is ~8 µm^{−1} in average. Multichannel nanotube field-effect transistors with a high-k top-gate structure are fabricated with aligned nanotubes. The devices show high-performance, normally on, and n-type conduction property without any doping process. A high on current of 1.3mA and a large transconductance of 0.23 mS for a channel width of 100 µm are obtained. The normally on and n-type property is attributed to fixed positive charges in the HfO_2 gate insulator and at the interfaces