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Gold‐Nanocluster‐Based Fluorescent Sensors for Highly Sensitive and Selective Detection of Cyanide in Water
Author(s) -
Liu Yanlan,
Ai Kelong,
Cheng Xiaoli,
Huo Lihua,
Lu Lehui
Publication year - 2010
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.200902062
Subject(s) - cyanide , nanoclusters , fluorescence , materials science , aqueous solution , tap water , quenching (fluorescence) , colloidal gold , selectivity , gold cyanidation , nanotechnology , photochemistry , inorganic chemistry , chemistry , nanoparticle , catalysis , organic chemistry , environmental science , environmental engineering , metallurgy , physics , quantum mechanics
A novel, gold‐nanocluster‐based fluorescent sensor for cyanide in aqueous solution, which is based on the cyanide etching‐induced fluorescence quenching of gold nanoclusters, is reported. In addition to offering high selectivity due to the unique Elsner reaction between cyanide and the gold atoms of gold nanoclusters, this facile, environmentally friendly and cost‐effective method provides high sensitivity. With this sensor, the lowest concentration to quantify cyanide ions could be down to 200 × 10 −9 M , which is approximately 14 times lower than the maximum level (2.7 × 10 −6 M ) of cyanide in drinking water permitted by the World Health Organization (WHO). Furthermore, several real water samples spiked with cyanide, including local groundwater, tap water, pond water, and lake water, are analyzed using the sensing system, and experimental results show that this fluorescent sensor exhibits excellent recoveries (over 93%). This gold‐nanocluster‐based fluorescent sensor could find applications in highly sensitive and selective detection of cyanide in food, soil, water, and biological samples.