Berlin 2018 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 49: Soft Matter Physics: Emerging Topics, New Instruments and Methods
CPP 49.10: Vortrag
Mittwoch, 14. März 2018, 17:30–17:45, C 230
Lab-on-a-chip - Electron paramagnetic resonance goes mini — •Silvio Künstner1, Benedikt Schlecker2, Anh Chu3, Jannik Möser1, Alexander Schnegg1, Jens Anders3, and Klaus Lips1 — 1Berlin Joint EPR Laboratory, Helmholtz-Zentrum Berlin für Materialien und Energie — 2Insitut für Mikroelektronik, Universität Ulm — 3Institut für Theorie der Elektrotechnik, Universität Stuttgart
Electron paramagnetic resonance (EPR) spectroscopy is one of the most powerful techniques used in physics, chemistry and materials science. It is a non-invasive technique sensitive to paramagnetic species, especially suited for the study of paramagnetic states in thin-film materials and at surfaces involved in chemical reactions. However, the current design of EPR spectrometers using a microwave (mw) resonator limits the versatility for operando measurements. Here, we present a radical new design of a miniaturised EPR spectrometer, implemented on a microchip (EPR-on-a-chip). EPRoC is no longer restricted by the boundary condition of a resonator and has a three order of magnitude higher spin sensitivity than conventional EPR. The sensor is a single coil scaled-down in size to a few 10-100 micrometer. Different from conventional EPR, EPRoC is carried out by sweeping the mw frequency instead of the magnetic field, enabling operation with a permanent magnet. Due to its compactness, EPRoC can be incorporated in conventional growth reactors, (electro)chemical cells or in harsh UHV environments. We will review the recent success of operando EPRoC, discuss the detection principle and demonstrate its superior sensitivity, and present first time-domain experiments with nanosecond resolution.