writer：Wei Lu, Chunxin Ma, Zhaowen Li, Jiawei Zhang*, Youju Huang, Qing Huang, Tao Chen*?
keywords：Dissolved carbon dioxide; Excimer emission; Optical sensors; Near-infrared fluorescence; Perylene bisimide
source：期刊
specific source：Sensors Actuators: B. Chem., 2017, 246, 631-637
Issue time：2017年
.A near-infrared (NIR) fluorescent “turn-on” probe is presented for dissolved carbon dioxide (dCO₂) detection in aqueous medium. This probe is based on perylene bisimide-functionalized hyperbranched polyethylenimine (PBI-HPEI) polymer, which exhibits typical NIR fluorescence due to the excimer emission of π-π stacked PBI fluorophores. Both UV-Vis absorption and fluorescent spectroscopy studies reveal that the PBI-HPEI polymer shows significantly dCO₂-sensitive NIR emission via a known photoinduced electron transfer (PET) mechanism. Importantly, this sensory system is characterized with facile synthesis, fast response, excellent water-solubility and wide linear detection concentration range. It is thus capable of detecting dCO₂ even in real-world carbonated beverages and drinking water samples. Additionally, in view of the modular design principle of the present fluorescent polymer with typical NIR excimer emission of π-π stacked PBI molecules, the proposed strategy is expected to be applicable to the fabrication of novel versatile NIR-emitting sensory materials.