Plasmonic-induced SERS enhancement of shell-dependent Ag@Cu₂O core–shell nanoparticles

Abstract

In this study, we designed shell-dependent Ag@Cu2O core–shell nanoparticles (NPs) for SERS study. Compared to Cu2O NPs, Ag@Cu2O core–shell NPs exhibited high SERS activity because of the localized surface plasmon resonance (LSPR) from Ag core.

Octahedral Cu2O@Co(OH)2 Nanocages with Hierarchical Flake‐Like Walls and Yolk‐Shell Structures for Enhanced Electrocatalytic Activity

“…As for Cu 2p spectra in Figure 3c, the peaks located at 931.3 and 951.3 eV are attributed to the binding energies of Cu 2p 3/2 and Cu 2p 1/2 from Cu + in Cu 2 O. [40] The other two peaks at 933.4 and 953.6 eV accompanied with a satellite peak at 941.9 eV are associated with Cu 2 + in Cu(OH) 2 species, [41] which may arise from the alkaline synthetic condition. The Cu 2p result suggests that Cu 2 O is dominant in Cu 2 O@Co(OH) 2 nanocages and a small amount of Cu(OH) 2 is presented in this sample.…”

“…Notably, the binding energy of Co 2p 3/2 for Cu 2 O@Co(OH) 2 nanocages shows a positive shift of 0.4 eV relative to that of amorphous Co(OH) 2 nanoparticles (Figure S5), suggesting the strong electronic interaction between Co(OH) 2 and Cu 2 O that causes charge redistribution. As for Cu 2p spectra in Figure c, the peaks located at 931.3 and 951.3 eV are attributed to the binding energies of Cu 2p 3/2 and Cu 2p 1/2 from Cu + in Cu 2 O . The other two peaks at 933.4 and 953.6 eV accompanied with a satellite peak at 941.9 eV are associated with Cu 2+ in Cu(OH) 2 species, which may arise from the alkaline synthetic condition.…”

Self-Assembled Ag-Cu2O Nanocomposite Films at Air-Liquid Interfaces for Surface-Enhanced Raman Scattering and Electrochemical Detection of H2O2

“…Figure 3 a displays the two strong peaks centered at 368.0 and 374.0 eV, belonging to Ag 3d 5/2 and Ag 3d 3/2 of Ag 0 , respectively [ 33 , 34 ]. Figure 3 b shows the peaks with binding energies of 931.9 and 951.7 eV, corresponding to Cu 2p 3/2 and Cu 2p 1/2 , respectively, indicating the presence of Cu 2 O in the film [ 35 , 36 ]. The XPS analysis proves that the obtained films are compounds composed of Ag and Cu 2 O.…”

“…This suggests that Cu 2 O in this nanocomposite film may play a main role for SERS enhancement. Meanwhile, Cu 2 O as semiconductors with poor conductivity generally shows much weaker resonance effect, and their SERS activity is much poorer than that of noble metals [ 36 ]. Therefore, the SERS activity of the films decreases with the increase of Cu 2 O content in the corresponding film.…”

Increasing local field by interfacial coupling in nanobowl arrays

“…[1][2][3][4][5][6] Two enhancement mechanisms are attributed to SERS enhancement: the charge transfer enhancement (CM) and the electromagnetic enhancement (EM). 7,8 The CM is introduced by charge transfer between the adsorbed analytes and the SERS substrates; whereas the EM stems from surface plasmon resonance on the metal substrates, which plays the domain role in SERS enhancement. Noble metal nanostructures are used as SERS substrates due to their fascinating surface plasmons, 9,10 which are determined by the type, shape, size of the metals and dielectric surrounding.…”