title: Current measurements in a wide dynamic range-applications in electrochemical nanotechnology.
abstract: Current measurements in a wide dynamic range from low picoamperes up to a few milliamperes are usually carried by implementing logarithmic current-to-voltage converter circuits. Conductance studies in nanoscale metal | molecule | metal junctions require measurements with a high dynamic range, good accuracy and reasonable speed simultaneously. In this work we propose two novel circuit solutions which comply with these conditions: one is based on a high-accuracy, fine-tunable logarithmic current-to-voltage converter. Another circuit implements a double-output (or multiple-output) linear current-to-voltage converter, for which the problem of range-switching has been circumvented. Both circuits were applied in constructing a low-current bipotentiostat dedicated to the electrochemical formation of molecular-scale gaps, and a novel scanning tunnelling microscope preamplifier stage for current-distance spectroscopy studies.
authors: Institute of Bio- and Nanosystems 3 and Center of Nanoelectronic Systems for Information Technology cni, Research Center Jülich, 52425 Jülich, Germany. Institute of Materials and Environmental Chemistry, Chemical Research Centre, Hungarian Academy of Sciences, Pusztaszeri út 59-67, H-1025 Budapest, Hungary.
authors: Gábor
authors: G
authors: Mészáros
authors: Chen
authors: C
authors: Li
authors: Ilya
authors: I
authors: Pobelov
authors: Thomas
authors: T
authors: Wandlowski