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HL: Fachverband Halbleiterphysik
HL 42: Oxide semiconductors
HL 42.8: Vortrag
Mittwoch, 18. März 2020, 11:45–12:00, POT 51
H2 S detection for medical breath analysis with surface functionalized ZnO nanowires — •Angelika Kaiser1, Erick Torres1, Tanja Mauritz1, Yujia Liu1, Florian Huber1, Ulrich Herr2, and Klaus Thonke1 — 1Institute of Quantum Matter, Ulm University — 2Institute of Functional Nanosystems, Ulm University
Numerous publications in the past years highlighted the potential importance of hydrogen sulfide (H2 S) detection for therapeutic applications and early diagnostics. It was suggested that an abnormal production of H2 S in the human respiratory system functions as an early biomarker for inflammatory diseases like asthma etc. Reliable breath analysis with respect to H2 S detection demands a reproducible and selective sensor device. Therefore, we present a planar resistive gas sensor based on the gas sensing approach of a ChemFET for medical breath analysis in an electronic nose approach. Here, the CVD grown zinc oxide (ZnO) nanowire (NW) surface operates as the gas sensitive open gate, while the conductive core serves as the source-drain channel. We investigated the benefit of surface modification of ZnO NWs, which are used for the detection of gaseous H2 S in the very low parts per billion (ppb) concentration range. In particular, we studied the catalytic effect of thin nanoparticle layers of gold (Au) or platinum (Pt) deposited on the ZnO NW surface in order to improve H2 S sensor sensitivity, selectivity and limit of detection. We find that surface modification with Au nanoparticles improves the overall sensor performance and allows for an exceptional detection limit below 10 ppb for H2 S diluted in synthetic air at room temperature.