Regensburg 2007 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 17: Micro and Nano Fluidics I: Structured Substrates
CPP 17.6: Vortrag
Mittwoch, 28. März 2007, 15:30–15:45, H37
Nanobubbles in Solid-State Nanopores — •U. F. Keyser1,2, R. M. M. Smeets1, M. Y. Wu1, N. H. Dekker1, and C. Dekker1 — 1Kavli Institute of Nanoscience, Delft University of Technology, The Netherlands — 2Institut für Experimentelle Physik I, Universität Leipzig, Germany
From conductance and noise studies, we infer that nanometer-sized gaseous bubbles (nanobubbles) are the dominant noise source in solid-state nanopores[1]. We study the ionic conductance through solid-state nanopores as they are moved through the focus of an infrared laser beam. The resulting conductance profiles show strong variations in both the magnitude of the conductance and in the low-frequency noise when a single nanopore is measured multiple times. Differences up to 5 orders of magnitude are found in the current power spectral density. In addition, we measure an unexpected double-peak ionic conductance profile. A simple model of a cylindrical nanopore that contains a nanobubble explains the measured profile and accounts for the observed variations in the magnitude of the conductance.
[1] R. M. M. Smeets, U. F. Keyser et al., Phys. Rev. Lett. 97, 088101 (2006)