Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: Poster: Nanoparticles and Composite Materials
CPP 8.36: Poster
Montag, 26. März 2012, 17:30–20:00, Poster A
Electrical investigation of gold nanoparticles using heterojunctions based on strained nanomembranes — •Maria Bendova1, Carlos Cesar Bof Bufon1, Sandeep Gorantla2, Mark H. Rümmeli2, and Oliver G. Schmidt1 — 1Institute for Integrative Nanosciences, IFW Dresden, Germany — 2Institute for Solid State Research, IFW Dresden, Germany
In this work we present the investigation of electrical transport across mono-/bilayers of capped Au nanoparticles (NPs) vertically contacted using strained nanomembranes [1]. The fabrication process consists of a strained Au nanomembrane which rolls up on top of a metal finger structure where the NPs layer was previously deposited. The strained nanomembrane-based electrode provides a soft yet robust contact on top of NPs. The fabrication process is compatible with standard micro-fabrication techniques and several devices can be created in parallel on a chip. This represents an advantage when compared with other contacting methods (STM, nanogap electrodes).
The transport measurements exhibit Coulomb blockade and Coulomb staircase behavior at 4 K, which is correlated with NPs size and the presence of organic tunneling barriers. The Coulomb peaks in the differential conductance spectra vanish above 50-70 K as the thermal energy exceeds the NPs charging energy. Thus, this method can be directly employed to contact various types of nanoparticulate materials, whereas averaged properties of a macroscopic set of NPs (areas of µm2) can be obtained.
[1] C. C. B. Bufon et al., Nano Lett., 2011, 11, 3727.