A new approach for isolation and identification of elecrtophilic mutagens from complex matrix was developed. Thiosulforfic anion was immobilized onto polystyrene beads and used as separation media. Potassium polystyry...A new approach for isolation and identification of elecrtophilic mutagens from complex matrix was developed. Thiosulforfic anion was immobilized onto polystyrene beads and used as separation media. Potassium polystyryl-thiosulfonate, prepared from polystyryl- sulfonyl chloride and KHS, was observed to selectively react with model electrophilic mutagens such as alkyl halides, ct-chloroketones and α-chloroesters to produce polystyryl-thiosulfonlc esters. After separation from other nonreactive organic compounds, the beads then reacted with ethanethiol to produce unsymmetrical ethyl disulfides which are easily detected by GC/MS. For one mutagenic compound, only one unsymmetrical disulfide was found to contain its structure part. Thus, the structure of the parent mutagens could be deduced from that of the unsymmetrical disulfides. The degree of functionalization of the potassium polystyryl-thiosulfonate resin was 1.11 mmol/g. Its reactivity was discussed and its recycling method was reported here.展开更多
Polystyrene sulfonate(PSS)functionalized ZnO nanowires were hydrothermally synthesized and assembled into a UV-activated optoelectronic NO_(2)sensor for the first time.In situ PSS functionalization during hydrothermal...Polystyrene sulfonate(PSS)functionalized ZnO nanowires were hydrothermally synthesized and assembled into a UV-activated optoelectronic NO_(2)sensor for the first time.In situ PSS functionalization during hydrothermal synthesis not only facilitated the formation of high-quality ZnO nanowires with small diameters and high aspect ratios,but also significantly improved the UV photoconductance of ZnO nanowires through photo-induced electron injection,leading to the enhanced optoelectronic properties of ZnO nanowires.The optoelectronic NO_(2)sensors based on PSS-functionalized ZnO nanowires showed much higher responses and faster response rates under UV illumination at room temperature(25℃).The responses ranged from 60%to 690%toward NO_(2)concentrations of 50 ppb to 2 ppm.Moreover,the optoelectronic sensors exhibited excellent reversibility,good stability and a low detection limit(5 ppb),making the efficient,optically controlled sensing of ppb-level NO_(2)gas possible.展开更多
Vertically aligned TiO2nanorods arrays were successfully synthesized on FTO glass by wet-chemical method.Based on polystyrene sulfate(PSS)functionalized TiO2nanorods arrays,a sandwich-structured hybrid UV photodetecto...Vertically aligned TiO2nanorods arrays were successfully synthesized on FTO glass by wet-chemical method.Based on polystyrene sulfate(PSS)functionalized TiO2nanorods arrays,a sandwich-structured hybrid UV photodetector was fabricated.The photo-to-dark current ratio of the device increases by more than 3 orders of magnitude with typical case,while the dark current is about 10 nA at 1 V bias.The high photoresponse together with the low dark current could probably contribute a large photocurrent and low-power application.The high performance of the hybrid material and facile low-cost fabrication of the UV detector make the devices promising for large-area UV photodetection applications.展开更多
文摘A new approach for isolation and identification of elecrtophilic mutagens from complex matrix was developed. Thiosulforfic anion was immobilized onto polystyrene beads and used as separation media. Potassium polystyryl-thiosulfonate, prepared from polystyryl- sulfonyl chloride and KHS, was observed to selectively react with model electrophilic mutagens such as alkyl halides, ct-chloroketones and α-chloroesters to produce polystyryl-thiosulfonlc esters. After separation from other nonreactive organic compounds, the beads then reacted with ethanethiol to produce unsymmetrical ethyl disulfides which are easily detected by GC/MS. For one mutagenic compound, only one unsymmetrical disulfide was found to contain its structure part. Thus, the structure of the parent mutagens could be deduced from that of the unsymmetrical disulfides. The degree of functionalization of the potassium polystyryl-thiosulfonate resin was 1.11 mmol/g. Its reactivity was discussed and its recycling method was reported here.
基金supported by the National Natural Science Foundation of China(No.51802123)the Natural Science Foundation of Jiangsu Province(No.BK20180630)the Fundamental Research Funds for the Central Universities(JUSRP11816).
文摘Polystyrene sulfonate(PSS)functionalized ZnO nanowires were hydrothermally synthesized and assembled into a UV-activated optoelectronic NO_(2)sensor for the first time.In situ PSS functionalization during hydrothermal synthesis not only facilitated the formation of high-quality ZnO nanowires with small diameters and high aspect ratios,but also significantly improved the UV photoconductance of ZnO nanowires through photo-induced electron injection,leading to the enhanced optoelectronic properties of ZnO nanowires.The optoelectronic NO_(2)sensors based on PSS-functionalized ZnO nanowires showed much higher responses and faster response rates under UV illumination at room temperature(25℃).The responses ranged from 60%to 690%toward NO_(2)concentrations of 50 ppb to 2 ppm.Moreover,the optoelectronic sensors exhibited excellent reversibility,good stability and a low detection limit(5 ppb),making the efficient,optically controlled sensing of ppb-level NO_(2)gas possible.
基金supported by the National Science Fund for Distinguished Young Scholars of China(Grant No.21125628)Young Scientists Fund of the National Natural Science Foundation of China(Grant No.21006008)
文摘Vertically aligned TiO2nanorods arrays were successfully synthesized on FTO glass by wet-chemical method.Based on polystyrene sulfate(PSS)functionalized TiO2nanorods arrays,a sandwich-structured hybrid UV photodetector was fabricated.The photo-to-dark current ratio of the device increases by more than 3 orders of magnitude with typical case,while the dark current is about 10 nA at 1 V bias.The high photoresponse together with the low dark current could probably contribute a large photocurrent and low-power application.The high performance of the hybrid material and facile low-cost fabrication of the UV detector make the devices promising for large-area UV photodetection applications.
