University of Oulu

Hajimammadov, R., Bykov, A., Popov, A., Juhasz, K., Lorite, G., Mohl, M., Kukovecz, A., Huuhtanen, M., Kordas, K. (2018) Random networks of core-shell-like Cu-Cu2O/CuO nanowires as surface plasmon resonance-enhanced sensors. Scientific Reports, 8 (1), . doi:10.1038/s41598-018-23119-6

Random networks of core-shell-like Cu-Cu₂O/CuO nanowires as surface plasmon resonance-enhanced sensors

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Author: Hajimammadov, Rashad1; Bykov, Alexander2; Popov, Alexey2;
Organizations: 1Microelectronics Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, 90570, Oulu, Finland
2Optoelectronics and Measurement Techniques Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, 90570, Oulu, Finland
3Department of Applied and Environmental Chemistry, University of Szeged, Rerrich Bela ter 1, Szeged, 6720, Hungary
4Environmental and Chemical Engineering Research Unit, Faculty of Technology, University of Oulu, P.O. Box 4300, 90570, Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3 MB)
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Language: English
Published: Springer Nature, 2018
Publish Date: 2018-04-13


The rapid oxide formation on pristine unprotected copper surfaces limits the direct application of Cu nanomaterials in electronics and sensor assemblies with physical contacts. However, it is not clear whether the growing cuprous (Cu₂O) and cupric oxides (CuO) and the formation of core-shell-like Cu-Cu₂O/CuO nanowires would cause any compromise for non-contact optical measurements, where light absorption and subsequent charge oscillation and separation take place such as those in surface plasmon-assisted and photocatalytic processes, respectively. Therefore, we analyze how the surface potential of hydrothermally synthetized copper nanowires changes as a function of time in ambient conditions using Kelvin probe force microscopy in dark and under light illumination to reveal charge accumulation on the nanowires and on the supporting gold substrate. Further, we perform finite element modeling of the optical absorption to predict plasmonic behavior of the nanostructures. The results suggest that the core-shell-like Cu-Cu₂O/CuO nanowires may be useful both in photocatalytic and in surface plasmon-enhanced processes. Here, by exploiting the latter, we show that regardless of the native surface oxide formation, random networks of the nanowires on gold substrates work as excellent amplification media for surface-enhanced Raman spectroscopy as demonstrated in sensing of Rhodamine 6G dye molecules.

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Series: Scientific reports
ISSN: 2045-2322
ISSN-E: 2045-2322
ISSN-L: 2045-2322
Volume: 8
Article number: 4708
DOI: 10.1038/s41598-018-23119-6
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
221 Nanotechnology
Funding: The work was partly financed by the project Suplacat (Academy of Finland). R. Hajimammadov acknowledges the funding received from the University of Oulu Graduate School, Advanced Materials Doctoral Programme. Support from the “Széchenyi 2020” program in the framework of GINOP-2.3.2-15-2016-00013 “Intelligent materials based on functional surfaces – from syntheses to applications” project and the OTKA NKFIH K 112531 grant is acknowledged. M.M. acknowledges funding from the University of Oulu (More-than-Moore research community).
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