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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 35: Poster Session II
CPP 35.18: Poster
Wednesday, March 29, 2023, 11:00–13:00, P1
Insights into the morphology-structure-property relationship of mesoporous ZnO films during humidity sensing — •Ting Tian1, Shanshan Yin1, Suo Tu1, Apostolos Vagias2, Anna-Lena Oechsle1, Tianxiao Xiao1, Sigrid Bernstorff3, and Peter Müller-Buschbaum1,2 — 1Technical University of Munich, TUM School of Natural Sciences, Department of Physics, Chair for Functional Materials, 85748 Garching — 2MLZ, TU München, 85748 Garching — 3Elettra-Sincrotrone Trieste S.C.p.A., Strada Statale 14 km 163.5, AREA Science Park, Basovizza, 34149 Trieste, Italy
Moisture can strongly influence the conductivity of ZnO semiconductors via the physisorption and chemisorption of water molecules on the ZnO surface. Mesoporous ZnO structures can facilitate the absorption process by providing a large surface area and active sites. However, little effort has been devoted yet to gain an in-depth understanding of the effect of water on the morphology and electrical property In the present work, different mesoporous ZnO thin films were synthesized by exploiting different diblock copolymers. Benefiting from the different inorganic frameworks, these thin films show significantly different structural properties and defects density. To explore the morphology-structure-property relationship, in situ Fourier-transform infrared spectroscopy (FTIR) was used to confirm the water absorption. Simutalenouesly, in situ grazing-incidence small-angle X-ray scattering (GISAXS) measurements were performed to investigate the morphology evolution, and in situ electrochemical impedance spectroscopy (EIS) was used to monitor the conductivity changes.