Entrapment into charge transfer complexes for resonant Raman scattering enhancement

Abstract

This communication suggests a new approach expanding the range of important analytes becoming available for Raman scattering enhancement due to entrapping them into charge-transfer complexes immobilized onto nanostructured substrates.

Surface Enhanced Raman Scattering Revealed by Interfacial Charge-Transfer Transitions

“…To achieve resonant Raman scattering enhancement for these important analytes, Sidorov et al proposed a strategy for entrapping these compounds into CT complexes, which would then be immobilized onto nanostructured Ag substrates. 108 A colored donor-acceptor CT complex would be formed between the electron-rich DBT and 2,3-dichloro-5,6-dicyano-1,4-benzoquinone as a p electron acceptor, leading to improved sensitivity in SERS and surface enhanced resonance Raman spectroscopy analysis.…”

Immobilization of nanostructured metal silver at the surface of anodic titanium dioxide for the creation of composites with the surface plasmon resonance

“…At the same time, at great contents of an analyte, one competitive process is fluorescence, which substantially overlaps Raman scattering in intensity. A surface-enhanced spectroscopy of Raman scattering (SERS), which is also called the spectroscopy of giant combinational scattering (GCS), significantly levels up the disadvantages of the common CS-spectroscopy, being a powerful nondestructive method for studying substance, which acquires ever greater popularity in the recent decade [1]. The prospects of this method are caused by a number of unique parameters such as high rapidness and the possibility of carrying out registration in situ, minimal sample preparation or the absence of any need for sample preparation, and the possibility of detecting trace amounts of substance in various molecular conformations [2] up to the possibility of detecting individual molecules [3].…”

Facile chemical routes to mesoporous silver substrates for SERS analysis

“…Nowadays SERS spectroscopy is an easily accessible method for routine analysis (even using portable Raman spectrometers) or more complicated analytical tools [ 18 ]. Different kinds of dilute analytes can be easily identified in pristine form or in the form of tinted charge-transfer complexes as proposed by Sidorov et al [ 19 ]. The analysis of analytes in the gas phase and the separate detection of tinted compounds in a mixture are more complex and still less efficient.…”