Premium
A Label‐Free Gold‐Nanoparticle‐Based SERS Assay for Direct Cyanide Detection at the Parts‐per‐Trillion Level
Author(s) -
Senapati Dulal,
Dasary Samuel S. R.,
Singh Anant K.,
Senapati Tapas,
Yu Hongtao,
Ray Paresh C.
Publication year - 2011
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201100617
Subject(s) - cyanide , colloidal gold , nanoparticle , raman spectroscopy , chemistry , surface enhanced raman spectroscopy , nanotechnology , cyanide ion , cyanide poisoning , inorganic chemistry , materials science , raman scattering , physics , optics
Cyanide is an extremely toxic lethal poison known to humankind. Developing rapid, highly sensitive, and selective detection of cyanide from water samples is extremely essential for human life safety. Driven by the need, here we report a gold‐nanoparticle‐based label‐free surface‐enhanced Raman spectroscopy (SERS) system for highly toxic cyanide ion recognition in parts‐per‐trillion level and to examine gold‐nanoparticle–cyanide interaction. We have shown that the SERS assay can be used to probe the gold nanoparticle dissociation process in the presence of cyanide ions. Our experimental data indicates that gold‐nanoparticle‐based SERS can detect cyanide from a water sample at the 110 ppt level with excellent discrimination against other common anions and cations. The results also show that the SERS probe can be used to detect cyanide from environmental samples.