Piezoelectric properties of template-free electrochemically grown ZnO nanorod arrays

Tamvakos, Dimitrios, Lepadatu, Serban orcid iconORCID: 0000-0001-6221-9727, Antohe, Vlad-Andrei, Tamvakos, Athanasios, Weaver, Paul, Piraux, Luc, Cain, Markys and Pullini, Daniele (2015) Piezoelectric properties of template-free electrochemically grown ZnO nanorod arrays. Applied Surface Science, 356 . pp. 1214-1220. ISSN 0169-4332

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Official URL: http://dx.doi.org/10.1016/j.apsusc.2015.08.187


In this work, we evaluated the piezoelectric properties of the ZnO nanorods (NRs), subsequently grownby a template-free electrochemical deposition (ECD) approach. The one-step preparation method yieldedin a relatively short-time synthesis large arrays of high aspect-ratio ZnO NRs, vertically aligned to the substrate and exhibiting a well-defined hexagonal symmetry coupled with an excellent crystallinity. Piezoresponse force microscopy (PFM) was employed to extract the effective piezoelectric coefficient (d33) of the ZnO [0 0 0 1]-oriented NRs. A mean effective d33 coefficient of 11.8 pm/V was measured overseveral individual NRs. The results have shown an increased piezoelectric response of the ZnO NRs, with∼18% in respect to the ZnO bulk material, and with a factor ranging from 28% to 167% compared to similar ZnO nanostructures prepared by other counterpart techniques. Both morphology and crystalline quality of the obtained ZnO NRs, as well as the piezoelectric investigations, ranked the ECD as a promising low-cost pathway for possibly producing high quality nanostructured ZnO-based piezoelectric devices with enhanced performance.

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