A close look at silver oxide colloid for surface-enhanced Raman scattering

The contribution of photoinduced charge-transfer enhancement to the SERS of uranyl(VI) in a uranyl-Ag2O complex

“…It has been reported that the SERS activity of Ag 2 O is essentially contributed by the Ag particles generated from the photochemical reduction during laser excitation [34]. In other words, EM enhancement should be responsible for the SERS effect.…”

Tuning the Surface-Enhanced Raman Scattering Effect to Different Molecular Groups by Switching the Silver Colloid Solution pH

“…46 Amino groups show a strong affinity toward the colloidal silver surface, even in the presence of other functional groups such as carboxylate that can compete for interaction with silver. 47 In these conditions, chemisorption of amino groups from hydroxylamine, the reduction agent, would be expected to occur via a nitrogen atom.…”

“…48 The strong band at 1146 cm À1 is assigned to the NH 2 twisting vibration. 31,47,49,50 The high intensity of this band indicates the interaction of the amino groups with the surface of the colloidal particles. 51 The broad and weak band at 1340 cm À1 is attributable to the symmetric stretching mode of the nitro groups.…”

The Role of O2 in SERS-Active Thin Metal Film Photodynamics

“…25,[42][43][44] As previously described, Dickson and co-workers confirmed the presence of silver oxides on TMF surfaces by XPS and postulated that metal clusters are generated by photoreduction of Ag 2 O on the surface. 25 Ag 2 O colloidal particles have been demonstrated to be activated for SERS by photochemical reduction of Ag 2 O to Ag n by Xiao et al 45 Finally, Mihalcea et al observed fluorescence from Ag n produced by photoactivation of reactively sputtered Ag oxide layers. 26 Based upon observation of the photoactivation of Ag TMF substrates under ambient and N 2 conditions, intermittent Raman spectral fluctuations in the presence of O 2 , 17 the absence of spectral fluctuation under N 2 atmosphere, and the apparent lack of reactions that decay the photoactivity of the surface under N 2 , it is hypothesized that blinking is due to a cyclic, O 2 -mediated process.…”