Berlin 2008 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 23: Quantum dots and wires: Transport properties I
HL 23.4: Talk
Tuesday, February 26, 2008, 11:45–12:00, EW 201
Electrochemical p-doping modification of carbon nanotubes with Prussian Blue — •Alicia Forment-Aliaga1, Ralf Thomas Weitz1, Marko Burghard1, and Klaus Kern1,2 — 1Max-Planck Institute for Solid State Research, Stuttgart, Germany — 2Institut de Physique des Nanostructures, EPFL, Lausanne, Switzerland
Electrochemical modification is an effective method to tune the properties of carbon nanotubes. In this communication, we report on the modification of individual carbon nanotubes (SWCNTs) by electrodeposition of the molecular magnet Prussian Blue (PB) FeIII4[FeII(CN)6]3*nH2O (n=14-16). While previous studies have primarily addressed the electrocatalytic properties of PB-modified bulk nanotube electrodes,1 the motivation behind the present work is to investigate the influence of inorganic coatings on the charge transport characteristics of individual SWCNTs. The formation of PB under the applied electrochemical conditions has been proven by various characterization techniques. In contrast to metallic SWCNTs whose electrical conductivity remained largely unaffected, semiconducting tubes exhibited a strongly altered behavior after PB deposition. Specifically, in the latter case, the conductance vs. gate voltage curves were substantially shifted toward more positive gate voltages, indicative of enhanced p-type doping of the tubes. Temperature-dependent measurements revealed that the threshold voltage decreases significantly upon cooling, which is attributed to freezing out of the hole transfer from PB to the underlying nanotubes. 1 J. Li et al. Adv. Funct. Mater. 2007, 17, 1574