Surface enhanced Raman spectroscopy (SERS) and density functional theory (DFT) study for understanding the regioselective adsorption of pyrrolidinone on the surface of silver and gold colloids

Mdluli, Phumlane Selby; Sosibo, Ndabenhle; Revaprasadu, Neerish; Karamanis, Panaghiotis; Leszczyński, Jerzy

doi:10.1016/j.molstruc.2009.06.039

Cited by 65 publications

(54 citation statements)

References 30 publications

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“…This fact is illustrated by the appearance of an intense band at 243 cm À1 in the SERS spectrum, characteristic for the vibration of Ag-O and Ag-N bonds, with no counterpart in the normal Raman spectrum. Similar values were reported for the wavenumbers assigned to Ag-N [24][25][26] or Ag-O [26,27] vibrations. Moreover, in order to simulate the interaction of the molecule with the silver surface we optimized two complexes formed between paroxetine molecule and one Ag atom arranged in the vicinity of the N22 atom of the molecule or in the close vicinity of dioxolane ring.…”

Section: Raman and Sers Spectrasupporting

confidence: 86%

IR, Raman, SERS and DFT study of paroxetine

Cozar

Szabó

Mare

et al. 2011

Journal of Molecular Structure

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Section: Raman and Sers Spectrasupporting

confidence: 86%

IR, Raman, SERS and DFT study of paroxetine

Cozar

Szabó

Mare

et al. 2011

Journal of Molecular Structure

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“…The Raman spectra of the PVP-capped Ag NPs (Fig. 2c) confirmed the presence of PVP at the surface as judged by Raman bands at 647, 765 cm −1 (ring torsion, out of plane), 941 cm −1 (CH out of plane bend), and 1362 cm −1 (ring breathing mode) (Mdluli et al 2009).…”

Section: Resultssupporting

confidence: 55%

Transformation of silver nanoparticles released from skin cream and mouth spray in artificial sweat and saliva solutions: particle size, dissolution, and surface area

Hedberg

Eriksson

Kesraoui

et al. 2020

Environ Sci Pollut Res

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The use of silver nanoparticles (Ag NPs) in consumer products can result in diffuse environmental dispersion of both NPs and ionic silver. This study investigated the transformation of Ag NPs present in two consumer products (skin cream, mouth spray) in terms of release of Ag NPs and ionic silver and changes in particle size in artificial sweat and saliva solutions. Large differences in silver release were observed with the smaller sized Ag NPs in mouth spray releasing more silver compared with the Ag NPs of the skin cream. Substantial particle agglomeration took place in both artificial sweat and saliva, forming large-sized agglomerates (> 100 nm). The amount of dissolved silver in solution after 24 h was less than 10% of the total amount of Ag NPs for both products. The results show that the Ag NPs of these consumer products will largely remain as NPs even after 24 h of skin or saliva contact. The use of normalization by geometric surface area of the particles was tested as a way to compare dissolution for Ag NPs of different characteristics, including pristine, bare, as well as PVP-capped Ag NPs. Normalization of silver dissolution with the geometric surface area was shown promising, but more extensive studies are required to unambiguously conclude whether it is a way forward to enable grouping of the dissolution behavior of Ag NPs released from consumer products.

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“…S1, Supporting Information). It has been confirmed that PVP were absorbed on the surface of AgNPs mainly through oxygen atom of the carboxylate group and probably nitrogen atom of the pyrrolidyl nitrogen group [19,20]. In comparison to PVP molecules, chlorides were found to have stronger interactions with the AgNPs surface, and be competent for the detachment of PVP molecules [21].…”

Section: Resultsmentioning

confidence: 99%