Nucleotide-directed syntheses of gold nanohybrid systems with structure-dependent optical features: Selective fluorescence sensing of Fe3+ ions

Ditta Ungor, Edit Csapó, Barbara Kismárton, Adám Juhász, I. Dékány

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

This study demonstrates a one-step synthesis for the preparation of both adenosine monophosphate (AMP)-stabilized colloidal gold nanoparticles (AMP-Au NPs) and fluorescent gold nanoclusters (AMP-Au NCs). The dominant role of AMP:AuCl4 molar ratios in the formation of diverse nanosized Au products was proved. The size, the structure and the unique structure-dependent optical properties of the NPs and NCs were determined based on the results of numerous spectroscopic (UV–vis, fluorescence, infrared, x-ray photoelectron), high resolution electron microscopy (HRTEM) and dynamic light scattering (DLS) techniques. Stabile AMP-Au NPs with diameter of ca. 11 nm and ultra-small AMP-Au NCs having blue fluorescence (λem = 480 nm) were identified. In addition, the AMP-Au NCs have been utilized to develop a selective sensor for the detection of Fe3+ ions in aqueous medium based on fluorescence quenching. Several essential metal ions and anions have been tested but our results clearly supported that dominant quenching was observed only for Fe3+ ions. Based on the determined limit of detection (LOD = 2.0 μM) our system is capable of detecting Fe3+ ions in drinking water. The Stern-Volmer constants (KSV) and various thermodynamic parameters (ΔG, ΔH°, ΔS°, ΔCp) of the quenching process have also been determined by the Stern-Volmer fitting of the fluorescence data in order to better understand the quenching mechanism.

Original languageEnglish
Pages (from-to)135-141
Number of pages7
JournalColloids and Surfaces B: Biointerfaces
Volume155
DOIs
Publication statusPublished - Jul 1 2017

Fingerprint

adenosine monophosphate
nucleotides
Adenosine Monophosphate
Nucleotides
Gold
Quenching
Fluorescence
Ions
gold
fluorescence
synthesis
quenching
ions
Nanoclusters
High resolution electron microscopy
Dynamic light scattering
Photoelectrons
Potable water
Infrared Rays
Metal ions

Keywords

  • Adenosine monophosphate
  • Biosensor
  • Fluorescence quenching
  • Gold nanoclusters
  • Gold nanoparticles
  • Iron ion

ASJC Scopus subject areas

  • Biotechnology
  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Nucleotide-directed syntheses of gold nanohybrid systems with structure-dependent optical features : Selective fluorescence sensing of Fe3+ ions. / Ungor, Ditta; Csapó, Edit; Kismárton, Barbara; Juhász, Adám; Dékány, I.

In: Colloids and Surfaces B: Biointerfaces, Vol. 155, 01.07.2017, p. 135-141.

Research output: Contribution to journalArticle

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