为提高ZnO基光催化剂对染料的降解性能,通过水热法制备活性炭(AC)/ZnO/MoS_(2)(AZM)复合光催化剂。分析活性炭掺杂量对复合催化剂降解甲基橙(MO)性能的影响,并对复合催化剂结构进行表征。结果表明:在所制备的催化剂中,0.1 g AC掺杂的复...为提高ZnO基光催化剂对染料的降解性能,通过水热法制备活性炭(AC)/ZnO/MoS_(2)(AZM)复合光催化剂。分析活性炭掺杂量对复合催化剂降解甲基橙(MO)性能的影响,并对复合催化剂结构进行表征。结果表明:在所制备的催化剂中,0.1 g AC掺杂的复合光催化剂(0.1 AZM)具有最佳的MO去除能力(约为96.5%);超声辅助的声-光催化降解速率(k=0.0158)比单一光催化(k=0.0119)约高32.8%。由此可知,适量的AC掺杂促进光催化剂与染料分子的接触,光催化剂在光照和超声协同作用下产生具有氧化性自由基,可降解MO。展开更多
Photogating is an effective strategy to modulate the channel conductance of the device with light-induced gate field or voltage,thereby improving the performance of optoelectronic devices.In this work,to overcome the ...Photogating is an effective strategy to modulate the channel conductance of the device with light-induced gate field or voltage,thereby improving the performance of optoelectronic devices.In this work,to overcome the long response time and low photoresponse of one-dimensional ZnO,a MoS_(2)-on-ZnO photogating vertical heterojunction photodetector is design and constructed.Herein,the ZnO nanowire with high carrier mobility can response ultraviolet light and supply a highspeed carrier transport channel,while the MoS_(2) flake as a photogating layer can response with visible light and transfer photogenerated electrons into the ZnO nanowire to adjust its conductivity.Thus,the irradiation of visible light is equivalent to applying a photo-induced gate voltage on the ZnO nanowire.In addition,the photogenerated electrons will not transmit through the MoS_(2) with low carrier mobility,so that not only the visible light response of the photodetector can be realized,but also its ultraviolet light response is able to be improved.Under ultraviolet light irradiation,the photoresponsivity of the photodetector can be reached to 273 A W-1and the response speed is less than 24 ms.More important,based on this unique heterojunction structure,MoS_(2)-on-ZnO photodetector also illustrates an excellent visible light response with a high photoresponsivity(74 A W-1) and fast response speed(<24 ms) due to the photogating effect.This work not only paves the way to design high-performance photodetectors with high photoresponsivity and fast response speed,but also provide a promising approach to improve the performance of optoelectronic devices using photogating effect.展开更多
A series of MoS_2/ZnO compound photocatalysts with different mass ratios were successfully prepared by hydrothermal method. The X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), scanning electron microsco...A series of MoS_2/ZnO compound photocatalysts with different mass ratios were successfully prepared by hydrothermal method. The X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), scanning electron microscope(SEM) and UV-vis absorption were used to characterize the prepared MoS_2/ZnO photocatalysts. It was proved that the combination of Mo S2 and Zn O can increase the content of oxygen vacancies on surface of Zn O, thus improving the light absorption capacity in visible light region and reducing the band gap of Zn O. And the photocatalytic performance of Zn O was improved. Experimental results show that the MoS_2/ZnO(3 wt%) compound has the highest degradation rate for methylene blue(MB) under visible light, which means that it has the best photocatalytic activity among all the prepared samples.展开更多
文摘为提高ZnO基光催化剂对染料的降解性能,通过水热法制备活性炭(AC)/ZnO/MoS_(2)(AZM)复合光催化剂。分析活性炭掺杂量对复合催化剂降解甲基橙(MO)性能的影响,并对复合催化剂结构进行表征。结果表明:在所制备的催化剂中,0.1 g AC掺杂的复合光催化剂(0.1 AZM)具有最佳的MO去除能力(约为96.5%);超声辅助的声-光催化降解速率(k=0.0158)比单一光催化(k=0.0119)约高32.8%。由此可知,适量的AC掺杂促进光催化剂与染料分子的接触,光催化剂在光照和超声协同作用下产生具有氧化性自由基,可降解MO。
基金partially supported by the Liaoning Province Natural Science Fund Program (2019-MS-333)the Youth Innovation Promotion Association,Chinese Academy of Sciences (2019197)the National Natural Science Foundation of China (51702326, 51872296)。
文摘Photogating is an effective strategy to modulate the channel conductance of the device with light-induced gate field or voltage,thereby improving the performance of optoelectronic devices.In this work,to overcome the long response time and low photoresponse of one-dimensional ZnO,a MoS_(2)-on-ZnO photogating vertical heterojunction photodetector is design and constructed.Herein,the ZnO nanowire with high carrier mobility can response ultraviolet light and supply a highspeed carrier transport channel,while the MoS_(2) flake as a photogating layer can response with visible light and transfer photogenerated electrons into the ZnO nanowire to adjust its conductivity.Thus,the irradiation of visible light is equivalent to applying a photo-induced gate voltage on the ZnO nanowire.In addition,the photogenerated electrons will not transmit through the MoS_(2) with low carrier mobility,so that not only the visible light response of the photodetector can be realized,but also its ultraviolet light response is able to be improved.Under ultraviolet light irradiation,the photoresponsivity of the photodetector can be reached to 273 A W-1and the response speed is less than 24 ms.More important,based on this unique heterojunction structure,MoS_(2)-on-ZnO photodetector also illustrates an excellent visible light response with a high photoresponsivity(74 A W-1) and fast response speed(<24 ms) due to the photogating effect.This work not only paves the way to design high-performance photodetectors with high photoresponsivity and fast response speed,but also provide a promising approach to improve the performance of optoelectronic devices using photogating effect.
基金supported by the Xinjiang Science and Technology Project (No.2019D01C036)。
文摘A series of MoS_2/ZnO compound photocatalysts with different mass ratios were successfully prepared by hydrothermal method. The X-ray diffraction(XRD), X-ray photoelectron spectroscopy(XPS), scanning electron microscope(SEM) and UV-vis absorption were used to characterize the prepared MoS_2/ZnO photocatalysts. It was proved that the combination of Mo S2 and Zn O can increase the content of oxygen vacancies on surface of Zn O, thus improving the light absorption capacity in visible light region and reducing the band gap of Zn O. And the photocatalytic performance of Zn O was improved. Experimental results show that the MoS_2/ZnO(3 wt%) compound has the highest degradation rate for methylene blue(MB) under visible light, which means that it has the best photocatalytic activity among all the prepared samples.
