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Driven by the need, here we report a gold\u2010nanoparticle\u2010based label\u2010free surface\u2010enhanced Raman spectroscopy (SERS) system for highly toxic cyanide ion recognition in parts\u2010per\u2010trillion level and to examine gold\u2010nanoparticle\u2013cyanide 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\u2010nanoparticle\u2010based SERS can detect cyanide from a water sample at the 110\u2005ppt 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.<\/jats:p>","DOI":"10.1002\/chem.201100617","type":"journal-article","created":{"date-parts":[[2011,6,10]],"date-time":"2011-06-10T12:12:07Z","timestamp":1307707927000},"page":"8445-8451","source":"Crossref","is-referenced-by-count":80,"title":["A Label\u2010Free Gold\u2010Nanoparticle\u2010Based SERS Assay for Direct Cyanide Detection at the Parts\u2010per\u2010Trillion Level"],"prefix":"10.1002","volume":"17","author":[{"given":"Dulal","family":"Senapati","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Samuel S. 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