Gold nanoparticle probes for the detection of mercury, lead and copper ions

Yang-Wei Lin, Chih Ching Huang, Huan Tsung Chang

Research output: Contribution to journalReview article

259 Citations (Scopus)

Abstract

Monitoring the levels of potentially toxic metal (PTM) ions (e.g., Hg 2+, Pb2+, Cu2+) in aquatic ecosystems is important because these ions can have severe effects on human health and the environment. Gold (Au) nanomaterials are attractive sensing materials because of their unique size- and shape-dependent optical properties. This review focuses on optical assays for Hg2+, Pb2+, and Cu2+ ions using functionalized Au nanomaterials. The syntheses of functionalized Au nanomaterials are discussed. We briefly review sensing approaches based on changes in absorbance resulting from metal ion-induced aggregation of Au nanoparticles (NPs) or direct deposition of metal ions onto Au NPs. The super-quenching properties of Au NPs allow them to be employed in 'turn on' and 'turn off' fluorescence approaches for the sensitive and selective detection of Hg2+, Pb2+, and Cu2+ ions. We highlight approaches based on fluorescence quenching through analyte-induced aggregation or the formation of metallophilic complexes of Au nanodots (NDs). We discuss the roles of several factors affecting the selectivity and sensitivity of the nanosensors toward the analytes: the size of the Au nanomaterial, the length and sequence of the DNA or the nature of the thiol, the surface density of the recognition ligand, and the ionic strength and pH of the buffer solution. In addition, we emphasize the potential of using new nanomaterials (e.g., fluorescent silver nanoclusters) for the detection of PTM ions.

Original languageEnglish
Pages (from-to)863-871
Number of pages9
JournalAnalyst
Volume136
Issue number5
DOIs
Publication statusPublished - 2011 Mar 7

Fingerprint

Mercury (metal)
Mercury
Nanostructured materials
Gold
Nanoparticles
Copper
Nanostructures
gold
Lead
probe
Metal ions
Ions
copper
ion
Poisons
Metals
Quenching
Agglomeration
Fluorescence
Nanosensors

All Science Journal Classification (ASJC) codes

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy
  • Electrochemistry

Cite this

Lin, Yang-Wei ; Huang, Chih Ching ; Chang, Huan Tsung. / Gold nanoparticle probes for the detection of mercury, lead and copper ions. In: Analyst. 2011 ; Vol. 136, No. 5. pp. 863-871.
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Gold nanoparticle probes for the detection of mercury, lead and copper ions. / Lin, Yang-Wei; Huang, Chih Ching; Chang, Huan Tsung.

In: Analyst, Vol. 136, No. 5, 07.03.2011, p. 863-871.

Research output: Contribution to journalReview article

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