title: Polymer Vesicle Sensor for Visual and Sensitive Detection of SO2in Water.
abstract: This study reports the first polymer vesicle sensor for the visual detection of SO2and its derivatives in water. A strong binding ability between tertiary alkanolamines and SO2has been used as the driving force for the detection by the graft of tertiary amine alcohol (TAA) groups onto an amphiphilic hyperbranched multiarm polymer, which can self-assemble into vesicles with enriched TAA groups on the surface. The polymer vesicles will undergo proton exchange with cresol red (CR) to produce CR-immobilized vesicles (CR@vesicles). Subsequently, through competitive binding with the TAA groups between CR and SO2or HSO3-, the CR@vesicles (purple) can quickly change into SO2@vesicles (colorless) with the release of protonated CR (yellow). Such a fast purple to yellow transition in the solution allows the visual detection of SO2or its derivatives in water by the naked eye. A visual test paper for SO2gas has also been demonstrated by the adsorption of CR@vesicles onto paper. Meanwhile, the detection limit of CR@vesicles for HSO3-is approximately 25 nM, which is improved by approximately 30 times when compared with that of small molecule-based sensors with a similar structure (0.83 μM). Such an enhanced detection sensitivity should be related to the enrichment of TAA groups as well as the CR in CR@vesicles. In addition, the CR@vesicle sensors also show selectivity and specificity for the detection of SO2or HSO3-among anions such as F-, Br-, Cl-, SO42-, NO2-, C2O42-, S2O32-, SCN-, AcO-, SO32-, S2-, and HCO3-.
authors.affiliation: School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, China.
authors.forename: Tong
authors.initials: T
authors.lastname: Huang
authors.affiliation: School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, China.
authors.forename: Zhilin
authors.initials: Z
authors.lastname: Hou
authors.affiliation: School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, China.
authors.forename: Qingsong
authors.initials: Q
authors.lastname: Xu
authors.affiliation: School of Chemical Engineering and Technology, Harbin Institute of Technology , Harbin 150001, PR China.
authors.forename: Lei
authors.initials: L
authors.lastname: Huang
authors.affiliation: School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, China.
authors.forename: Chuanlong
authors.initials: C
authors.lastname: Li
authors.affiliation: School of Chemistry and Chemical Engineering, State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University , 800 Dongchuan Road, Shanghai 200240, China.
authors.forename: Yongfeng
authors.identifier: 0000-0001-6282-5882
authors.initials: Y
authors.lastname: Zhou