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PREPARATION OF ZnO/ORGANOSILANE/ZnO HYBRID THIN FILMS VIA ATOMIC LAYER DEPOSITION (ALD) AND SOLUTION SURFACE MODIFICATION

PREPARATION OF ZnO/ORGANOSILANE/ZnO HYBRID THIN FILMS VIA ATOMIC LAYER DEPOSITION (ALD) AND SOLUTION SURFACE MODIFICATION Maria Kolympadi Markovic, a, b, c Robert Peter, a, b Ivana Jelovica Badovinac, a, b Iva Šarić, a, b Marko Perčić, b, d Rafaela Radičić, a Dean Marković, e Mato Knez, f Gabriela Ambrožića, b, * a University of Rijeka, Department of Physics, R. Matejčić 2, 51000 Rijeka, Croatia b Centre for Micro- and Nanosciences and Technologies, R. Matejčić 2, 51000 Rijeka, Croatia c Currently at e d University of Rijeka, Faculty of Engineering, Vukovarska 58, 51000 Rijeka, Croatia e University of Rijeka, Department of Biotechnology, R. Matejčić 2, 51000 Rijeka, Croatia f CIC nanoGUNE, E-20018 San Sebastian, Spain and IKERBASQUE, Basque Foundation for Science, E-48013 Bilbao, Spain * gabriela.ambrozic@uniri.hr Stable organic-inorganic hybrid thin films with the “sandwich” structure, ZnO/organosilane/ZnO, were prepared using ALD grown ZnO layers and surface modification with the bifunctional (3- mercaptopropyl)trimethoxysilane (MPTMS) in solution.[1] Formation of monolayer or multilayers of MPTMS molecules are driven by the strong S-Zn bonds. Silane self-condensation reaction led to the growth of a cross-linked polymer. A top layer of ALD ZnO was deposited on the free thiol –SH and silanol Si-OH groups exposed on this soft polymer substrate. Thermal removal of the organic part induced morphological changes due to the template effect of the sacrificial polymer. The resulting ZnO thin films showed improved UVA photocatalytic activities against the degradation of methyl orange, compared to the initial ALD ZnO layer and to control samples. The resulting materials were characterized by XPS spectroscopy, SEM and AFM microscopies, and SIMS mass spectrometry. Acknowledgments. Croatian Science Foundation (WATPUR, IP-2016-06-3568) ; University of Rijeka (16.12.2.1.01) ; European Fund for Regional Development (Research Infrastructure for Campus based Laboratories, RC.2.2.06-0001). REFERENCES [1] M. Kolympadi Markovic, R. Peter, I. Jelovica Badovinac, I. Saric, M. Perčić, R. Radičić, D. Marković, M. Knez, G. Ambrožić, Nanotechnology 2020, 31, 185603.

Materials and nanotechnology

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