The charge transfer effect on SERS in a gold-decorated surface defect anatase nanosheet/methylene blue (MB) system

Abstract

Revealing substrate−molecule vibronic coupling enhancement, especially photoinduced charge transfer (CT) process, is hugely important for understanding Surface-enhanced Raman spectroscopy (SERS) enhancement mechanism. In this work, oxygen atoms were extracted from...

Monodisperse Ag Nanoparticle-Decorated Bacterial Nanocellulose as Flexible Surface-Enhanced Raman Scattering Sensors for Trace Detection of Toxic Thiram

“…The main Raman peaks of MB powder are located at 448, 505, 594, 773, 1184, 1400, 1502, and 1624 cm –1 (Figure b). These results are consistent with literature reports. , The detailed Raman vibrational assignments of MB molecules are displayed in Table S1.…”

“…These results are consistent with literature reports. 48,49 The detailed Raman vibrational assignments of MB molecules are displayed in Table S1.…”

2D TiS2‐Nanosheet‐Coated Concave Gold Arrays with Triple‐Coupled Resonances as Sensitive SERS Substrates

“…The Raman signals observed at 891, 1155, 1182, 1300, 1393, 1434, 1504, and 1622 cm −1 are the typical vibrational modes of MB (Table S2, Supporting Information), in agreement with previous reports. [32][33][34] To fabricate a plasmonic substrate under excitation with a laser wavelength of 633 nm, we deposited gold layers of different thicknesses to prepare various CGA substrates, and investigated their SERS performances in the detection of 10 −7 m MB. Figure 3c shows that the intensity of the SERS signals increased when the thickness of the gold layer was increased from 10 to 30 nm, and then declined after further increasing the thickness from 30 to 90 nm.…”

Molecular-Enhanced Raman Spectroscopy Driven by Phosphoester Electron-Transfer Bridge

“…For each APM analyte, the varied EF and ER values reflect the degree of CT fluctuation at different vibrational modes . The variations in molecular and electronic structure caused by CT can be analyzed using Raman peak shapes and vibrational frequencies.…”

“…For each APM analyte, the varied EF and ER values reflect the degree of CT fluctuation at different vibrational modes. 35 The variations in molecular and electronic structure caused by CT can be analyzed using Raman peak shapes and vibrational frequencies. The results of spectroscopic analysis (Figure S14) revealed that the aromatic −CH and −N(H)R (R = H or alkyl) groups in APM compounds were complexed with POE through hydrogen bonds (H-bond).…”