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Biological application of water-based electrochemically synthesized CuO leaf-like arrays: SERS response modulated by the positional isomerism and interface type.

Abstract

Cupric oxide leaf-like nanostructures (CuONSs) (the average dimensions of 80 – 180 nm in width and 400 – 750 nm in length) were synthesized by anodic electrochemical dissolution of copper in an ethanol solution containing LiCl electrolyte and water. Ultraviolet-visible (UV-Vis), Fourier-transform infrared (FT-IR), and Raman spectroscopies as well as scanning electron microscope (SEM) and X-ray powder diffraction (XRD) were used to explore the metal surface plasmon, size, rheology, and structure of CuONSs. Then, pyridine α−aminophosphinic acid isomers (α–, β–, and γ–NHPy) were synthesized and assembled on the CuONSs/air and CuONSs/aqueous solution interfaces at pH level of solution = 7. Differences in adsorption and thus, in the spectral response resulting from positional isomerism, were examined by surface-enhanced Raman scattering (SERS) with the 785 nm excitation wavelength. The manner of interaction of the investigated isomers with CuONSs in an aqueous solution was discussed in detail and compared with that at the CuONSs/air interface. For γ–NHPy, at the CuONSs/water interface, the time-dependent changes in the spectral profile were observed and analyzed. For β–NHPy at the CuONSs/air interface, tip-enhanced Raman scattering (TERS) measurements were performed. These measurements allowed to observe single molecule behavior and avoid interference from molecule’ surrounding environment.

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Publication details

The article was received on 02 Sep 2017, accepted on 13 Nov 2017 and first published on 13 Nov 2017


Article type: Paper
DOI: 10.1039/C7CP06001G
Citation: Phys. Chem. Chem. Phys., 2017, Accepted Manuscript
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    Biological application of water-based electrochemically synthesized CuO leaf-like arrays: SERS response modulated by the positional isomerism and interface type.

    E. Proniewicz, S. Vantasin, T. K. Olszewski, B. Boduszek and Y. Ozaki, Phys. Chem. Chem. Phys., 2017, Accepted Manuscript , DOI: 10.1039/C7CP06001G

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