Optimized electromagnetic enhancement and charge transfer in MXene/Au/Cu₂O hybrids for achieving efficient SERS

Abstract

The rational optimization of the electromagnetic field enhancement and charge transfer in Raman substrate is vital for efficient surface-enhanced Raman scattering (SERS). Herein, a ternary plasmonic substrate, which structure-adjustable Au...

Ultrasensitive and reusable Cu2O/Ag composite SERS substrates for trace thiram detection

“…39,40 The CM effect primarily arises from the CT between the SERS-active substrate and the probe molecule, leading to enhanced polarization of the probe molecule and consequently resulting in significant SERS enhancement. 36,41 The absorption spectrum of the Cu 2 O/Ag-90/R6G hybrid system shown in Fig. S4 (ESI†) and the weak SERS signal of R6G molecules on the pristine Cu 2 O substrate shown in Fig.…”

Au nanoparticles decorated β-Bi2O3 as highly-sensitive SERS substrate for detection of methylene blue and methyl orange

“…For structurally sensitive SERS functional materials such as noble metals/semiconductor composites, precise regulation is necessary to achieve optimal performance, which was again confirmed in this work. 22…”

“…In addition, the electric field induced by noble metals on the surface can amplify both the Raman signals of analyte molecules and the polarization caused by electron transfer, thus further enhancing SERS activity. 22 Moreover, this combination also enhances the stability and reproducibility of the SERS signals, making them valuable for a wide range of applications in analytical chemistry, materials science, and other fields. 23…”

“…In addition, the electric field induced by noble metals on the surface can amplify both the Raman signals of analyte molecules and the polarization caused by electron transfer, thus further enhancing SERS activity. 22 Moreover, this combination also enhances the stability and reproducibility of the SERS signals, making them valuable for a wide range of applications in analytical chemistry, materials science, and other fields. 23 In recent years, semiconductor bismuth oxide (Bi 2 O 3 ) has gained increasing attention as a potential visible-light-driven photocatalyst due to its simple composition, relatively narrow bandgap (2.2-2.8 eV), 24 and its ability to be excited by light with wavelengths up to 445 nm, including visible and ultraviolet (UV) light.…”

Hydration deactivation mechanism of the 〈100〉 oriented cuprous oxide photocathodes in solar water splitting and the regenerated three-dimensional structure

“…11,12 With a maximum theoretical solar-to-hydrogen efficiency of about 18%, cuprous oxide (Cu 2 O) is a promising photocathode whose band gap can be adjusted between 2.0 and 2.3 eV using various preparation techniques. 13–16 At the same time, Cu 2 O is an inexpensive inorganic oxide semiconductor whose constituent elements are abundant and non-toxic. 17,18…”