University of Oulu

E. Bozo et al., "Cu-Pd Bimetal and CuPt Alloy Nanotubes Derived From Cu Nanowires: Novel Amplification Media for Surface-Enhanced Raman Spectroscopy," in IEEE Sensors Journal, vol. 20, no. 1, pp. 143-148, 1 Jan.1, 2020. doi: 10.1109/JSEN.2019.2939677

Cu-Pd bimetal and CuPt alloy nanotubes derived from Cu nanowires : novel amplification media for surface-enhanced Raman spectroscopy

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Author: Bozo, Eva1; Dombovari, Aron1,2; Mohl, Melinda1,2;
Organizations: 1Microelectronics Research Unit, University of Oulu, FIN-90570 Oulu, Finland
2Silicon Austria Labs GmbH, High Tech Campus Villach, A-9524 Villach, Austria
3Research Unit of Medical Imaging, Physics and Technology, University of Oulu, Oulu, Finland
4Department of Material Science and NanoEngineering, Rice University, Houston, Texas 77005, United States
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 4 MB)
Persistent link:
Language: English
Published: Institute of Electrical and Electronics Engineers, 2020
Publish Date: 2020-01-30


Surface-plasmons of metals have been utilized to enhance the Raman spectra of various adsorbed moieties for over decades. While amplification of the spectral intensity takes place on most of the metals, due to their superb properties, Au, Ag and Cu surfaces represent the benchmark in surface-enhanced Raman spectroscopy. In this paper, we show that Cu-Pd bimetal and CuPt alloy nanotubes derived from Cu nanowires by simple galvanic exchange reactions are suitable for the efficient enhancement of Raman spectra when dispersed on Si surfaces. Amplification factors of 120× on Cu nanowires, 150× on Cu-Pd bimetal nanotubes and 250× on CuPt alloy nanotubes in reference to the substrate are measured for rhodamine 6G and methyl violet model compounds. We also show that the nanotubes dispersed on Au surfaces can contribute to a further intensity enhancement of the substrate and detect analytes adsorbed from 10 −6 M analyte concentrations. Our results obtained using bimetallic and alloy nanomaterials shed light on a new strategy to synthetize and apply new types of metal nanostructures and compositions for surface-enhanced Raman spectroscopy in the future.

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Series: IEEE sensors journal
ISSN: 1530-437X
ISSN-E: 1558-1748
ISSN-L: 1530-437X
Volume: 20
Issue: 1
Pages: 143 - 148
DOI: 10.1109/JSEN.2019.2939677
Type of Publication: A1 Journal article – refereed
Field of Science: 221 Nanotechnology
Funding: The support received from the EU Interreg Nord and Lapin liitto (project Transparent, Conducting and Flexible films for electrodes), EU BBI JU (project NewPack) as well as from the Academy of Finland (project SuPlaCat) is acknowledged.
EU Grant Number: (792261) NEWPACK - Development of new Competitive and Sustainable Bio-Based Plastics
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