writer：Wei Lu, Peng Xiao, Zhenzhong Liu, JincuiGu, Jiawei Zhang*, Youju Huang, Qing Huang and Tao Chen*
keywords：carbon disulfide,dithiocarbamate,excimer emission, ratiometricfluorescent probe, self-assembled micellar nanoprobe
source：期刊
specific source：ACS Applied Materials & Interfaces, 2016, 8, 20100–20109
Issue time：2016年
.The detection of highly toxic CS₂, which is known as a notorious occupational hazard in various industrial processes, is important from an environmental and a public safety perspective. We describe here a robust type of chemical reaction-based supramolecular fluorescent nanoprobes for ratiometric determination of CS₂ with high selectivity and sensitivity in water medium. The micellar nanoprobes self-assemble from amphiphilicpyrene-modified hyperbranchedpolyethyleneimine (Py-HPEI) polymers with intense pyrene excimer emission. Selective sensing is based on a CS₂-specific reaction with hydrophilic amino groups to produce hydrophobic dithiocarbamate moieties, which can strongly quench the pyrene excimer emission via a known photoinduced electron transfer (PET) mechanism.Therefore, the developed micellar nanoprobes are free of H₂S-interferencing problem often countered in the widely-used colorimetric assays and proved to show high selectivity over many potentially competing chemical species. Importantly, the developed approach is capable of CS₂ sensing even in complex tap and river water samples. In addition, in view of the modular design principle of these powerful micellar nanoprobes, the sensing strategy used here is expected to be applicable to the development of various sensory systems for other environmentally important guest species.