Highly selective and sensitive colorimetric detection of Ag(I) using N-1-(2-mercaptoethyl)adenine functionalized gold nanoparticles

Yi Ming Sung, Shu-Pao Wu*

*Corresponding author for this work

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

A sensitive and selective colorimetric Ag+ detection method was developed by using N-1-(2-mercaptoethyl)adenine functionalized gold nanoparticles (MEA-AuNPs). The presence of Ag+ immediately induced aggregation of MEA-AuNPs, yielding a color change from red to blue. This Ag +-induced aggregation of MEA-AuNPs was monitored by bare eye and UV-vis spectroscopy with a detection limit of 3.3 nM. MEA-AuNPs showed excellent selectivity toward Ag+ compared with other metal ions through interaction between adenine and Ag+. The best detection of Ag + was achieved at pH 6-9. Furthermore, MEA-AuNPs were applied to detect Ag+ in lake water with low interference.

Original languageEnglish
Pages (from-to)172-176
Number of pages5
JournalSensors and Actuators, B: Chemical
Volume197
DOIs
StatePublished - 5 Jul 2014

Keywords

  • Adenine
  • Colorimetric sensor
  • Gold nanoparticles

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