Journal
ANALYST
Volume 137, Issue 10, Pages 2338-2343Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2an35147a
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Funding
- Australian Research Council [LP100200593]
- Australian Government
- University of New South Wales
- Australian Research Council [LP100200593] Funding Source: Australian Research Council
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Silver nanoparticles capped with mercaptoacetic acid and 2-aminoethanethiol short-chain alkanethiols were prepared by a one-step method in aqueous solution for monitoring pH and a range of heavy metal ions. The mode of transduction is optical, based on the change in aggregation of the nanoparticles in solution. Because of the different ionic interactions between the modified nanoparticles, these nanoparticle sensors can rapidly detect Pb2+, Cu2+ and Fe2+, with detection limits as low as 1 x 10(-5) M, 5 x 10(-7) M and 5 x 10(-5) M respectively, as well as having the ability to detect Cu2+ ions from Pb2+ and Fe2+. Furthermore, the same functionalised nanoparticles are also sensitive to pH; exhibiting a good linear dynamic response between pH 1 and 10.
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