Forschungszentrum Juelich Gmbh

Forschungszentrum Julich Gmbh

Svetlana Vitusevich

Norbert Klein

Sergli Pud

Serhiy Danylyuk

Jing Li

Ihor Zadorozhnyi

Sergii Pud

An apparatus for measuring electrical potentials of a liquid sample includes at least one field effect transistor having a source, a drain, and a gate, a substrate, and at least two intersecting nanowires of semiconductive material arranged on the substrate, each having a source and drain contact as a field effect transistor and a voltage applicator configured to apply a voltage between the respective source and drain contact. The cross section of the two nanowires has a shape of a triangle or a trapezium. A voltage applicator configured to apply a voltage to the substrate are arranged on the substrate. The nanowires are electrically insulated at least against the sample by a dielectric layer along their surface having a layer thickness between 5 and 40 nm, and at least one impurity is arranged in the dielectric layer as a bearing point which is capable of capturing charge carriers.

Apparatus based on a nanowire cross for measuring small potentials of a sample, method for producing the apparatus, and use of the apparatus

A device and a method for measuring small voltages and potentials on biological, chemical and other samples. The device comprises at least one field effect transistor including a source, a drain, a gate that is in contact with the sample and insulated by a gate dielectric from the conducting channel of the field effect transistor, means for applying a voltage between the source and the drain, and means for applying a bias voltage to the gate. The gate dielectric includes at least one attachment site in the interior thereof, which is able to trap charge carriers from the channel and, conversely, to release these to the channel. Such an attachment site superimposes the current flowing through the channel, and thus through the transistor, with a telegraph modulation signal by continuously statistically exchanging charge carriers with the channel, the characteristic time constants of the telegraph modulation signal being usable as a measuring signal for the potential or voltage of the sample instead of the previously used average time value of the drain current. In this way, a larger portion of the measured information is evaluated with respect to the required result, which considerably improves the sensitivity and accuracy of the measurement.

Device and method for measuring small voltages and potentials on a biological, chemical or other sample

A resonator arrangement has a conductive, semi-open outer housing, at an interior of which a conductive bar is provided disposed coaxially to the housing. At one end of the bar in a direction of a housing bottom, the bar has a die and, together with a dielectric and the housing bottom, forms a capacitor. The bar is short-circuited to the housing at another end, so that the bar and housing together form an LC oscillator circuit. Also disclosed is a method for analyzing a sample using a resonator arrangement.

Resonator arrangement and method for analyzing a sample using the resonator arrangement

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Dueren, Germany

Svetlana Vitusevich