Protonation of the methyl orange derivative of aspartate adsorbed on colloidal silver: a surface-enhanced resonance Raman scattering and fluorescence emission study

Adsorption orientations and interactions of methyl orange on negatively and positively charged colloidal silver particles

“…Furthermore, seen from the SERS spectra, not only SERS intensity but also peak positions are much different between them. The vibrational assignments of MO's normal Raman signals (NRS) and SERS in two colloidal systems are shown in Table 1 [19,20].…”

Studies of quenching and enhancement of fluorescence of methyl orange adsorbed on silver colloid

“…One important consequence of this type of adsorption is the enhancement of optical processes such as surface-enhanced Raman scattering (SERS) [5][6][7], enhanced absorption, enhanced and quenched fluorescence [8,9], etc. Although most works on fluorescence of molecules adsorbed onto metal surfaces have been measured in connection with SERS, there are reports on either fluorescence quenching or enhancement accompanying the enhancement of the Raman signals [10][11][12].…”

“…Knowledge about the excitation and deactivation of dye molecules adsorbed onto metal surfaces [10,11,13] provides valuable information about the enhancement mechanism. However, up to now, the quenching and enhancement of fluorescence have always been studied in the different molecule systems due to the absorption substrate, which results in difficulty for further theoretical research [14,15].…”

Photophysics of Rhodamine B Interacting with Silver Spheroids

“…This is good evidence that the nonradiative deactivation pathway of excited RB is independent of the presence of silver. SERS enhancement increases with the aggregation of the sol (3,4,16), but for xanthenes aggregation must be induced by increasing the ionic strength (16,26). The extinction spectra of Ag sols containing RB are very sensitive to the Na 2 SO 4 concentration as shown in Fig.…”

“…One important consequence of this type of interaction is the enhancement of optical processes such as surface enhancement Raman scattering (SERS), enhanced absorption, enhanced fluorescence, enhanced photochemistry, and enhanced nonlinear optical phenomena (1,2). Although most of work on fluorescence of dyes adsorbed on silver colloids has been measured in connection with SERS, there are reports on either fluorescence quenching or enhancement accompanying the enhancement of the Raman signal (2)(3)(4)(5).…”