The reproducibility of the prepared SERS substrates was investigated and the SERS signals intensity variation was <28%.ĭegree of charge-transfer Enhancement factor Pulsed laser ablation Spherical Cu/Cu(2)O core-shell NPs Surface enhanced Raman scattering (SERS).Ĭopyright © 2019. The results demonstrate that the LSPR enhancement dominates charge-transfer resonance contribution in SERS of Cu/Cu2O-CV and Cu/Cu2O -MB systems. The intensities of the totally and non-totally symmetric modes were used to calculate the degree of charge-transfer. The average particle size of Cu 2 O in the nanospheres on the surface of the coreshell Fe 3 O 4 was estimated as 16 nm by using Scherrer's formula. The effect of localized surface plasmon resonance (LSPR) from Cu core contributing to the electromagnetic enhancement and Cu2O shell with a rough surface which itself contributes to chemical enhancement with adsorbed analyte molecule is due to a high overall SERS enhancement. Moreover, the coreshell Fe 3 O 4 Cu 2 O nanomaterial has an average diameter of about 700 nm that can be evidenced from the particle size distribution shown in Fig. The SERS activity of Cu/Cu 2O core-shell NPs substrates was investigated by using crystal violet (CV) and methylene blue (MB) as the analyte molecules under 532 nm excitation wavelength irradiation. Actually, in many cases Cu is expected to play a vital role as a shell. So far, literature reporting the successful synthesis of such a structure is very scarce, if any. Raman, Fourier transform infrared (FTIR) spectroscopy and TEM imaging of the prepared NPs reveal the existence of additional minority CuO phase, not determined earlier through XRD patterns. As a result, it is a challenging task to fabricate the structure with Cu2O core and Cu shell (Cu2OCu), the opposite construction to the usual CuCu2O core-shell structure. In order to perform SERS (surface-enhanced Raman scattering) measurements, spherical Cu/Cu 2O core-shell NPs with a rather rough rugged surface and well-defined crystallographic structures were fabricated using nanosecond Ce: Nd YAG pulsed laser ablation in liquid (PLAL). Here, we have synthesized Au-Cu(2)O core-shell heterostructures using gold nanoplates, nanorods, octahedra, and highly faceted nanoparticles as the structure-directing cores for the overgrowth of Cu(2)O shells by a facile aqueous solution approach.

Cu2o al2o3 core shell