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Chiral CdSe nanoplatelets as an ultrasensitive probe for lead ion sensing

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Abstract

As opposed to traditional photoluminescence and ultra-violet based optical sensing, we present here a sensing system based on resolved optically active polarization with promising applications. It is based on the ultrathin CdSe nanoplatelets (NPLs) when modified with either L or D-cysteine molecules (L/D-cys) as bio-to-nano ligands. The chiral ligand transfers its chiroptical activity to the achiral nanoplatelets with an anisotropy factor of ∼10−4, which unlocks the chiral excitonic transitions and allows lead ion detection with a limit of detection (LOD) as low as 4.9 nM. Simulations and modelling based on time-dependent density functional theory (TD-DFT) reveal the chiral mechanism of L/D-cys capped CdSe NPLs. The presented CD-based sensing system illustrates an alternative possibility of using chiral CdSe NPLs as competitive chiral sensors for heavy metal ion detection.

Graphical abstract: Chiral CdSe nanoplatelets as an ultrasensitive probe for lead ion sensing

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Publication details

The article was received on 29 Dec 2018, accepted on 05 Mar 2019 and first published on 06 Mar 2019


Article type: Paper
DOI: 10.1039/C8NR10506E
Citation: Nanoscale, 2019, Advance Article

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    Chiral CdSe nanoplatelets as an ultrasensitive probe for lead ion sensing

    X. Wang, J. Hao, J. Cheng, J. Li, J. Miao, R. Li, Y. Li, J. Li, Y. Liu, X. Zhu, Y. Liu, X. W. Sun, Z. Tang, M. Delville, T. He and R. Chen, Nanoscale, 2019, Advance Article , DOI: 10.1039/C8NR10506E

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