Aggregation-aided SERS: Selective detection of arsenic by surface-enhanced Raman spectroscopy facilitated by colloid cross-linking

0561796 - ÚOCHB 2024 RIV NL eng J - Journal Article
Das, Moumita - Gangopadhyay, Debraj - Pelc, Radek - Hadravová, Romana - Šebestík, Jaroslav - Bouř, Petr
Aggregation-aided SERS: Selective detection of arsenic by surface-enhanced Raman spectroscopy facilitated by colloid cross-linking.
Talanta. Roč. 253, February (2023), č. článku 123940. ISSN 0039-9140. E-ISSN 1873-3573
R&D Projects: GA MŠMT(CZ) EF16_019/0000729; GA ČR(CZ) GA22-04669S
Institutional support: RVO:61388963
Keywords : arsenic detection * surface-enhanced Raman scattering * silver nanoparticles * colloid cross-linking
OECD category: Physical chemistry
Impact factor: 6.1, year: 2022
Method of publishing: Limited access
https://doi.org/10.1016/j.talanta.2022.123940

Arsenic of natural or industrial origin often occurs in water and makes it impotable. Due to its high toxicity, very sensitive detection is required. In the present study an ultra-sensitive arsenite (As3+) sensing is reported, based on aggregation-aided surface-enhanced Raman scattering (AA-SERS) of modified silver colloids. SERS intensity of mercapto-compounds attached to the colloidal silver nanoparticles surface is greatly increased in the presence of arsenic. Colloid aggregation is facilitated by cross-linking, a meshwork consisting of arsenic atoms and glutathione bridges is formed, as indicated by UV–Vis absorption spectroscopy, TEM and Raman imaging. The best 2-mercaptopyridine reporter molecule makes it possible to directly detect As3+ at concentrations as low as 0.5 ppb, which is better than achieved by the SERS technique so far.
Permanent Link: https://hdl.handle.net/11104/0334304