Jump to Main Content
Chiral β-HgS quantum dots: Aqueous synthesis, optical properties and cytocompatibility
- Yang, Feifei, Gao, Guanbin, Wang, Juncheng, Chen, Rui, Zhu, Wenbo, Wang, Liang, Ma, Zhongjie, Luo, Zhuoying, Sun, Taolei
- Journal of colloid and interface science 2019 v.537 pp. 422-430
- Oriental traditional medicine, absorption, aqueous solutions, circular dichroism spectroscopy, cytotoxicity, enantiomers, fluorescence, fluorescent dyes, ligands, mercuric chloride, monitoring, optical isomerism, optical properties, photothermotherapy, quantum dots, sodium sulfide, transistors, water solubility
- β-HgS quantum dots (QDs) have drawn enormous attention due to the size-tunable bandgap and the lowest quantum state in conduction band which have been applied to semiconductor transistor and photodetector. Though β-HgS is the essential component of Tibetan medicine, the potential toxicity of β-HgS limits its applications, especially in bio-application. Herein, chiral biomolecule enantiomers N-isobutyryl-L(D)-cysteine (L(D)-NIBC) and L(D)-cysteine (L(D)-Cys) were introduced into HgCl2 and Na2S aqueous solution to synthesize chiral β-HgS QDs in one-pot, which significantly improved their water-solubility and cytocompatibility. Notably, all chiral β-HgS QDs showed none cytotoxicity even at high concentration (20 mg·L−1), and the cytocompatibility of D-β-HgS QDs was better than corresponding L-β-HgS QDs at the concentration of 20 mg·L−1. This cytotoxicity discrimination was associated with the chirality inversion of chiral β-HgS QDs compared with the corresponding chiral ligands. In-situ real-time circular dichroism (CD) monitoring indicated that the chirality of β-HgS QDs originated from the asymmetrical arrangement of chiral ligands on the achiral core surface. Their chiroptical activity, near-infrared optical absorption (800 nm), fluorescence emission (900–1000 nm), high-performance photothermal conversion and good cytocompatibility, implied chiral β-HgS QDs could be used as a candidate material for photothermal therapy or a near-infrared fluorescent probe in organism, which brings a novel insight for bio-application of β-HgS QDs.