Open AccessChiral CdSe nanoplatelets as an ultrasensitive probe for lead ion sensing
Author(s) -
Xiongbin Wang,
Junjie Hao,
Jiaji Cheng,
Junzi Li,
Jun Miao,
Ruxue Li,
Yiwen Li,
Jiagen Li,
Yuhui Liu,
Xi Zhu,
Yanjun Liu,
Xiao Wei Sun,
Zikang Tang,
MarieHélène Delville,
Tingchao He,
Rui Chen
Publication year - 2019
Publication title -
nanoscale
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.038
H-Index - 224
eISSN - 2040-3372
pISSN - 2040-3364
DOI - 10.1039/c8nr10506e
Subject(s) - chirality (physics) , selectivity , materials science , molecule , ion , nanotechnology , lead (geology) , chemistry , organic chemistry , physics , catalysis , geomorphology , geology , chiral symmetry breaking , quantum mechanics , nambu–jona lasinio model , quark
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.
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