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
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.
