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HL: Fachverband Halbleiterphysik
HL 64: Poster: Photovoltaics and Optics
HL 64.10: Poster
Wednesday, March 22, 2017, 15:00–19:00, P1C
H2S-sensing with ZnO NWs and the role of oxygen in the sensing mechanism — •Angelika Kaiser, Florian Huber, Sören Riegert, Manfred Madel, and Klaus Thonke — Institute of Quantum Matter / Semiconductor Physics Group, Ulm University
ZnO nanostructures are a promising candidate in the realization of a fast and portable H2S-sensing device. However the lack of a reliable detection mechanism has hindered the development and manufacture of an effective sensor yet. General detection properties like selectivity, sensitivity and sensing recovery are still in need of further enhancement.
In our work we demonstrate the H2S-sensing performance of two sets of differently grown ZnO nanowires. Besides conventionally grown ZnO nanowires, using gold as catalyst material on silicon, catalyst-free ZnO nanowires grown on sapphire are equally fabricated. We investigate oxygen as the crucial contributor in the H2S-sensing mechanism. It is found that flushing the sensor device with different concentrations of oxygen reveals an additional increase in the H2S-sensitivity and primarily a clear enhancement in the recovery property of the ZnO nanowires. Furthermore we characterize the temperature dependency of our sensor structure in regards of an overall optimal operating ambient.