Luminescent nanoprobes based on upconversion nanoparticles and single-walled carbon nanohorns or graphene oxide for detection of Pb2+ ion. Issue 22 (2nd February 2016)

• Record Type: Journal Article
• Authors: Xu, Yanxia; Meng, Xianfu; Liu, Jinliang; Dang, Song; Shi, Liyi; Sun, Lining
• Is Part Of: CrystEngComm. Volume 18:Issue 22(2016)
• Page Start: 4032
• Page End: 4037
• Publication Date: 2016-02-02
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/c5ce02537k
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : Two kinds of luminescent "turn-on" nanoprobes were developed for detecting Pb 2+ ions based on luminescence resonance energy transfer between upconversion nanoparticles and single-walled carbon nanohorns or graphene oxide. Abstract : Two kinds of luminescent nanoprobes were developed for Pb 2+ detection based on luminescence resonance energy transfer (LRET) by using sodium citrate functionalized upconversion nanoparticles (Cit-UCNPs) as the energy donor and single-walled carbon nanohorns (SWCNHs) or graphene oxide (GO) as the energy acceptor. A Pb 2+ aptamer 5′-NH2 -(CH2 )6 -GGGTGGGTGGGTGGGT-3′ (denoted as pDNA) sequence was assembled with Cit-UCNPs to form the Cit-UCNPs–pDNA. By using the SWCNHs (or GO) as matrix, the final Cit-UCNPs–pDNA–SWCNHs (or Cit-UCNPs–pDNA–GO) nanoprobe can be obtained, in which the LRET process happened and the upconversion luminescence of the probe was quenched. With the addition of Pb 2+, a stable G-quadruplex–Pb 2+ complex was formed, which results in the separation between Cit-UCNPs–pDNA nanoparticles and SWCNHs (or GO) and the recovery of the upconversion luminescence. The two turn-on luminescence probes could detect Pb 2+ ions from amongst other ions with high sensitivity and selectivity in aqueous solution. To the best of our knowledge, a nanoprobe for the detection of Pb 2+ ions based on LRET between UCNPs and SWCNHs (or GO) has not been reported in the literature to date. This work demonstrates a simple yet powerful sensing strategy, which may open up potential perspectives for environmental monitoring applications.