The electrochemical preparation of arrays of copper ultramicro-wires (CuUWs) by using porous membranes as templates is critically revisited, with the goal of obtaining cheap but efficient substrates for surface enhanced Raman spectroscopy (SERS). The role of the materials used for the electrodeposition is examined, comparing membranes of anodized aluminum oxide (AAO) vs. track-etched polycarbonate (PC) as well as copper vs. glassy carbon (GC) as electrode material. A voltammetric study performed on bare electrodes and potentiostatic tests on membrane coated electrodes allowed the optimization of the deposition parameters. The final arrays of CuUWs were obtained by chemical etching of the template, with NaOH for AAO and CH2Cl2 for PC. After total etching of the template, SERS spectra were recorded on CuUWs using benzenthiol as SERS probe with known spectral features. The CuUW substrates displayed good SERS properties, providing enhancement factor in the 103–104 range. Finally, it was demonstrated that higher Raman enhancement can be achieved when CuUWs are decorated with silver nanostars, supporting the formation of SERS active hot-spots at the bimetallic interface.

Surface enhanced raman spectroscopy with electrodeposited copper ultramicro-wires with/without silver nanostars decoration / M. Longoni, M.S. Zalaffi, L. de Ferri, A.M. Stortini, G. Pojana, P. Ugo. - In: NANOMATERIALS. - ISSN 2079-4991. - 11:2(2021 Jan 18), pp. 518.1-518.16. [10.3390/nano11020518]

Surface enhanced raman spectroscopy with electrodeposited copper ultramicro-wires with/without silver nanostars decoration

M. Longoni
Primo
;
2021-01-18

Abstract

The electrochemical preparation of arrays of copper ultramicro-wires (CuUWs) by using porous membranes as templates is critically revisited, with the goal of obtaining cheap but efficient substrates for surface enhanced Raman spectroscopy (SERS). The role of the materials used for the electrodeposition is examined, comparing membranes of anodized aluminum oxide (AAO) vs. track-etched polycarbonate (PC) as well as copper vs. glassy carbon (GC) as electrode material. A voltammetric study performed on bare electrodes and potentiostatic tests on membrane coated electrodes allowed the optimization of the deposition parameters. The final arrays of CuUWs were obtained by chemical etching of the template, with NaOH for AAO and CH2Cl2 for PC. After total etching of the template, SERS spectra were recorded on CuUWs using benzenthiol as SERS probe with known spectral features. The CuUW substrates displayed good SERS properties, providing enhancement factor in the 103–104 range. Finally, it was demonstrated that higher Raman enhancement can be achieved when CuUWs are decorated with silver nanostars, supporting the formation of SERS active hot-spots at the bimetallic interface.
Anodized aluminum oxide; Benzenethiol; Copper; Electrochemical deposition; SERS; Silver nanostars; Template; Track-etched polycarbonate; Ultramicrowire
Settore CHIM/01 - Chimica Analitica
Settore CHIM/02 - Chimica Fisica
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/898122
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