Colorimetric detection of Cd(II) ions based on di-(1H-pyrrol-2-yl) methanethione functionalized gold nanoparticles

Yi Ming Sung, Shu-Pao Wu*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

A sensitive and selective colorimetric Cd2+ detection method was developed using di-(1H-pyrrol-2-yl)methanethione functionalized gold nanoparticles (DP-AuNPs). Aggregation of DP-AuNPs was induced immediately in the presence of Cd2+, yielding a color change from red to blue. This Cd2+-induced aggregation of DP-AuNPs was monitored using the naked eye and UV-vis spectroscopy. The SPR absorbance (635 nm) of the reaction between DP-AuNPs and Cd2+ shows a good linearity in the Cd2+ concentration range of 0.5-16 μM and a low detection limit 16.6 nM (S/N = 3). The DP-AuNPs showed excellent selectivity toward Cd2+ compared to other metal ions Ag+, Al3+, Ca2+, Cd 2+, Co2+, Cr3+, Cu2+, Fe 2+, Fe3+, Hg2+, Mg2+, Mn 2+, Ni2+, Pb2+, and Zn2+. Optimal detection of Cd2+ was achieved over a pH range from 4 to 9.5. Furthermore, DP-AuNPs were applied to detect Cd2+ in lake water, showing low interference.

Original languageEnglish
Pages (from-to)86-91
Number of pages6
JournalSensors and Actuators, B: Chemical
Volume201
DOIs
StatePublished - 1 Oct 2014

Keywords

  • Cd(II)
  • Colorimetric sensor
  • Di-(1H-pyrrol-2-yl) methanethione
  • Gold nanoparticles

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