State Key Laboratory of Applied Organic Chemistry and Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province , Lanzhou University , Lanzhou , 730000 , P. R. China.
College of Chemistry and Molecular Engineering , Zhengzhou University , Zhengzhou 450001 , China.
Anal Chem. 2019 Aug 20;91(16):10823-10829. doi: 10.1021/acs.analchem.9b02468. Epub 2019 Jul 30.
New strategies for portable detection of highly toxic environmental pollutants are still in urgent need. Here, through Pd and methylene blue (MB) coordination, photothermal two-dimensional palladium coordination polymers nanosheets (2D PdCPsNSs) have been synthesized for sensitive photothermal detection of HS. The sensing mechanism is based on the decomposing effect of HS to 2D PdCPsNSs, accompanied by the decrease of PdCPsNSs concentration and the increase of MB concentration. Upon HS addition, the heat released from the 2D PdCPsNSs under 808 nm lasers irradiation decreased, and the heat released from the MB increased under 650 nm lasers irradiation, respectively. Such temperature change signals could be easily detected by a portable thermometer. The 2D PdCPsNSs showed highly sensitive ratiometric response to HS with a detection limit of 30 nM. In addition, such probe presents an excellent selective ratiometric response to HS relative to other anionic species and thiols because of the specific interaction between Pd and HS. Moreover, the probe was suitable for the ratiometric determination of HS in different actual water samples, providing a promising platform for convenient, stable, and universal analysis of HS.
仍然迫切需要用于便携式检测高毒性环境污染物的新策略。在这里，通过钯和亚甲基蓝（MB）的配位，合成了用于 HS 灵敏光热检测的二维钯配位聚合物纳米片（2D PdCPsNSs）。传感机制基于 HS 对 2D PdCPsNSs 的分解作用，伴随着 2D PdCPsNSs 浓度的降低和 MB 浓度的增加。加入 HS 后，808nm 激光照射下 2D PdCPsNSs 释放的热量减少，650nm 激光照射下 MB 释放的热量增加。这些温度变化信号可以通过便携式温度计轻松检测到。2D PdCPsNSs 对 HS 表现出高灵敏度的比率响应，检测限为 30 nM。此外，由于 Pd 和 HS 之间的特异性相互作用，该探针相对于其他阴离子物种和硫醇表现出优异的选择性比率响应。此外，该探针适用于不同实际水样中 HS 的比率测定，为 HS 的方便、稳定和通用分析提供了有前途的平台。
