Journal
FRONTIERS OF MATERIALS SCIENCE
Volume 5, Issue 3, Pages 322-328Publisher
HIGHER EDUCATION PRESS
DOI: 10.1007/s11706-011-0118-4
Keywords
lead(II) ion; glutathione (GSH); gold nanoparticle (Au NP); detection; colorimetric response
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Funding
- China-Korea Joint Research Project [2010DFA51700]
- 100-Talent Program of the Chinese Academy of Sciences
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Direct mixture of Au3+ with glutathione (GSH), which act as both reduction agents and stabilizers, in aqueous solution gave rise to production of gold nanoparticles (Au NPs) with uniform sizes of around 21 nm. The GSH stabilizer Au NPs in solution show immediate aggregation after addition of 1 mol/L NaCl aqueous solution containing Pb2+ ions. The Pb2+-induced aggregation in Au NP solution is monitored by both colorimetric response and UV-vis spectroscopy. A rather broad linear range (from 0.1 to 30 mu mol/L) and low detection limit (0.1 mu mol/L) are explored for Au NP sensors used for detection of Pb2+ ions. Furthermore, the response of GSH-stabilized Au NPs toward Pb2+ ions is specific compared with other possible interferants (Hg2+, Mg2+, Zn2+, Ni2+, Cu2+, Co2+, Ca2+, Mn2+, Cd2+, and Ba2+).
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