Vibrational Modes Study of Methyl Orange Using Sers-Measurement and the DFT Method

Abstract

This paper experimentally observes the Normal Raman spectrum (NRS) and infrared absorption spectrum of methyl orange (MO) and presents theoretical vibrational spectra calculated from a density functional theory (DFT) method on the basis of B3LYP with 6–31 basis set. The calculated results show very good agreement with the experimentally observed IR and Raman frequencies. We also report the surface enhanced Raman spectrum (SERS) of MO adsorbed on silver nanoparticles surface. Finally, the possible adsorbed state of MO on the silver nanoparticles surface is discussed.

Facile room-temperature synthesis of cetyltrimethylammonium bromide (CTAB) coated spherical silver nanoparticles and their surface-enhanced Raman scattering (SERS) and antibacterial applications

“…When different concentrations of MO were dried on top of AgNPs deposited on the Siwafer, the signature Raman peaks of MO appear in the spectra. The most prominent peaks were at 1129 cm − 1 , 1157 cm − 1 , 1466 cm − 1 , and 1643 cm − 1 which agrees well with the reported literature (JIA et al 2008;Vorob'ev et al 2018). Furthermore, the concentration of MO was reduced to detect the sensitivity of AgNPs, and concentrations as low as 10 − 10 Mwere easily detected, with a good signal-to-noise ratio.…”

Nanocrystalline CeO2−δ as Effective Adsorbent of Azo Dyes

“…The IR spectra of pure dyes have some common characteristic bands. ,,− The bands at 1040/1120 cm –1 in MO, 1054/1139 cm –1 in RO16, and 1044/1136 cm –1 in MB9 originate from the symmetric stretching vibrations of the SO 3 – group (ν s (SO 3 – )). The band at 1204 cm –1 in MO, 1236 cm –1 in RO16, and 1190 cm –1 in MB9 represents the asymmetric stretching vibrations of the SO 3 – group (ν as (SO 3 – )).…”

In SituDetection of Trace Furfural in Aqueous Solution Based on Au Nanoparticle/Au Film Surface-Enhanced Raman Spectroscopy

“…Currently, the in situ SERS detection of aqueous furfural remains at the initial stages. Several studies [13,14] experimentally and theoretically analyzed the SERS spectra of furfural collected on Ag nanoparticles, copper electrodes, and silver mirrors, and the corresponding adsorbed states of furfural were also discussed. However, traditional substrates can only provide finite "hot spots," where strong field enhancement occurs.…”