WANG, Xiongbin; HAO, Junjie; CHENG, Jiaji; LI, Junzi; MIAO, Jun; LI, Ruxue; LI, Yiwen; LI, Jiagen; LIU, Yuhui; ZHU, Xi; LIU, Yanjun; SUN, Xiao Wei; TANG, Zikang; DELVILLE, Marie-Hélène; HE, Tingchao; CHEN, Rui

doi:10.1039/c8nr10506e

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WANG, Xiongbin

HAO, Junjie
Institut de Chimie de la Matière Condensée de Bordeaux [ICMCB]

CHENG, Jiaji
College of Physics and Energy
School of Materials Science and Engineering

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Nanoscale. 2019, vol. 11, n° 19, p. 9327-9334

Royal Society of Chemistry

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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.< Réduire

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Chiral CdSe nanoplatelets as an ultrasensitive probe for lead ion sensing

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