High-quality PMMA/ZnO NWs piezoelectric coating on rigid and flexible metallic substrates

M. Chelu, H. Stroescu, M. Anastasescu, J. M. Calderon-Moreno, S. Preda, M. Stoica, Z. Fogarassy, P. Petrik, M. Gheorghe, C. Parvulescu, C. Brasoveanu, A. Dinescu, C. Moldovan, M. Gartner

Research output: Article


This paper reports the comparative study of piezoelectric nanostructures deposited on metallic flexible substrate versus rigid substrates as a new architecture for energy harvesters. Rigid metallic substrates are multi-layered types of Pt/Ti/SiO2/Si or Au/Ti/SiO2/Si while Ti foil is a flexible metallic substrate. The active piezo-layer consisted of a vertical ZnO nanowires (ZnO NWs) array grown by the hydrothermal method at low temperature, on a previously deposited crystalline seed (nucleation) sol-gel layer and covered with a layer of polymethylmethacrylate (PMMA). The new obtained nanostructures have been characterized in different stages of preparation by X-Ray Diffraction, Scanning and Transmission Electron Microscopy, Atomic Force Microscopy, Spectroscopic Ellipsometry. The piezoelectric performance of PMMA/(ZnO NWs)/Ti structures was evaluated by measuring the d33 coefficient. Results show that ZnO nanowires have successfully grown on the flexible substrates with a piezoelectric coefficient four times greater than on rigid substrates. By improving vertical integration of ZnO NWs on flexible metallic substrate, PMMA/(ZnO NWs)/Ti affordable nanostructures open the way towards integration in wireless or defence technologies and in wearable or implantable biomedical systems as efficient harvester.

Original languageEnglish
Article number147135
JournalApplied Surface Science
Publication statusPublished - nov. 1 2020

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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    Chelu, M., Stroescu, H., Anastasescu, M., Calderon-Moreno, J. M., Preda, S., Stoica, M., Fogarassy, Z., Petrik, P., Gheorghe, M., Parvulescu, C., Brasoveanu, C., Dinescu, A., Moldovan, C., & Gartner, M. (2020). High-quality PMMA/ZnO NWs piezoelectric coating on rigid and flexible metallic substrates. Applied Surface Science, 529, [147135]. https://doi.org/10.1016/j.apsusc.2020.147135