Issue 22, 2016

Luminescent nanoprobes based on upconversion nanoparticles and single-walled carbon nanohorns or graphene oxide for detection of Pb2+ ion

Abstract

Two kinds of luminescent nanoprobes were developed for Pb2+ 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 Pb2+ 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 Pb2+, a stable G-quadruplex–Pb2+ 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 Pb2+ 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 Pb2+ 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.

Graphical abstract: Luminescent nanoprobes based on upconversion nanoparticles and single-walled carbon nanohorns or graphene oxide for detection of Pb2+ ion

Supplementary files

Article information

Article type
Communication
Submitted
24 dec 2015
Accepted
18 jan 2016
First published
18 jan 2016

CrystEngComm, 2016,18, 4032-4037

Luminescent nanoprobes based on upconversion nanoparticles and single-walled carbon nanohorns or graphene oxide for detection of Pb2+ ion

Y. Xu, X. Meng, J. Liu, S. Dang, L. Shi and L. Sun, CrystEngComm, 2016, 18, 4032 DOI: 10.1039/C5CE02537K

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