Chiral CdSe nanoplatelets as an ultrasensitive probe for lead ion sensing. Issue 19 (26th March 2019)

• Record Type: Journal Article
• Authors: 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
• Is Part Of: Nanoscale. Volume 11:Issue 19(2019)
• Page Start: 9327
• Page End: 9334
• Publication Date: 2019-03-26
• Subjects: Nanoscience -- Periodicals; Nanotechnology -- Periodicals; 620.505
• DOI: 10.1039/c8nr10506e
• Languages: English
• ISSNs: 2040-3364

Abstract

Abstract : Achiral CdSe NPLs could show chirality through ligand exchange with chiral cysteine molecules. Chiral CdSe NPLs were successfully applied as a chiral probe to detect lead ions with high sensitivity and selectivity. 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 eitherl ord -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 ofl /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.