本文设计了基于二维玻璃态石墨烯的多功能器件.与本征石墨烯相比,扭曲的晶格结构打开了玻璃态石墨烯的带隙,表现出与石墨烯类似甚至更优异的光电探测与化学传感性能.由于玻璃态石墨烯与空气中的小分子间较强的相互作用,该器件受到光致...本文设计了基于二维玻璃态石墨烯的多功能器件.与本征石墨烯相比,扭曲的晶格结构打开了玻璃态石墨烯的带隙,表现出与石墨烯类似甚至更优异的光电探测与化学传感性能.由于玻璃态石墨烯与空气中的小分子间较强的相互作用,该器件受到光致脱附的影响更小,呈现出正的光响应.在405 nm的激光照射下,器件的响应率为0.22 A W^(-1),探测率为10^(10)Jones.此外,玻璃态石墨烯中的固有缺陷和应变可增强分析物的吸附,获得良好的化学传感性能.玻璃态石墨烯器件探测丙酮的信噪比为48,比石墨烯器件提高了50%以上.此外,对偏压和厚度有关的挥发性有机化合物(VOC)感测功能的分析表明,少层玻璃态石墨烯更为敏感.这项研究表明玻璃态石墨烯在集成光电探测和化学传感多功能器件方面具有巨大应用前景.展开更多
For achieving water splitting into hydrogen under sunlight for practical applications,the high efficiencies of the photoreduction of CO_(2) over TiO_(2)/Fe3O4 photocatalysts combined with hydrogenation of water splitt...For achieving water splitting into hydrogen under sunlight for practical applications,the high efficiencies of the photoreduction of CO_(2) over TiO_(2)/Fe3O4 photocatalysts combined with hydrogenation of water splitting over Pt/TiO_(2) were investigated by practical concentrated solar energy compared with Hg lamp and Xe lamp.Based on AI analysis on the influence factors,the key parameters for TOC concentration were photocatalysts,Na2CO3 concentration and radiation intensity while the key parameters for hydrogen production were photocatalysts,radiation intensity,and TOC concentration.Accordingly,the mechanism of concentrated sunlight effects has been discussed from the view of thermodynamics and kinetics.The concentrated sunlight provides a simultaneous supply of sufficient electron–hole pairs and thermal energy.Water to hydrogen and CO_(2) reduction are both enhanced in concentrated sunlight due to endothermal reactions.Doping changes the internal electric field of p-n junction of in different possible ways,and thus composite photocatalysts with favorable formation of p-n junctions would enhance the charge separation by internal electric field.Moreover,photocatalysts are beneficial for providing more excited electrons at a time for achieving CO_(2) photoreduction at the surface region of the particles with higher density of radiation by concentrated solar energy.Subsequently,products from CO_(2) photoreduction,acting as sacrificial electron donors,improved hydrogen evolution in solar-mediated water splitting for prohibiting reverse reactions.展开更多
基金supported by the National Natural Science Foundation of China (61974014)the EPSRC Future Compound Semiconductor Manufacturing Hub (EP/P006973/1)。
文摘本文设计了基于二维玻璃态石墨烯的多功能器件.与本征石墨烯相比,扭曲的晶格结构打开了玻璃态石墨烯的带隙,表现出与石墨烯类似甚至更优异的光电探测与化学传感性能.由于玻璃态石墨烯与空气中的小分子间较强的相互作用,该器件受到光致脱附的影响更小,呈现出正的光响应.在405 nm的激光照射下,器件的响应率为0.22 A W^(-1),探测率为10^(10)Jones.此外,玻璃态石墨烯中的固有缺陷和应变可增强分析物的吸附,获得良好的化学传感性能.玻璃态石墨烯器件探测丙酮的信噪比为48,比石墨烯器件提高了50%以上.此外,对偏压和厚度有关的挥发性有机化合物(VOC)感测功能的分析表明,少层玻璃态石墨烯更为敏感.这项研究表明玻璃态石墨烯在集成光电探测和化学传感多功能器件方面具有巨大应用前景.
基金This paper was supported by Sino-Europe Research Program-China(MJ-2020-D-09)。
文摘For achieving water splitting into hydrogen under sunlight for practical applications,the high efficiencies of the photoreduction of CO_(2) over TiO_(2)/Fe3O4 photocatalysts combined with hydrogenation of water splitting over Pt/TiO_(2) were investigated by practical concentrated solar energy compared with Hg lamp and Xe lamp.Based on AI analysis on the influence factors,the key parameters for TOC concentration were photocatalysts,Na2CO3 concentration and radiation intensity while the key parameters for hydrogen production were photocatalysts,radiation intensity,and TOC concentration.Accordingly,the mechanism of concentrated sunlight effects has been discussed from the view of thermodynamics and kinetics.The concentrated sunlight provides a simultaneous supply of sufficient electron–hole pairs and thermal energy.Water to hydrogen and CO_(2) reduction are both enhanced in concentrated sunlight due to endothermal reactions.Doping changes the internal electric field of p-n junction of in different possible ways,and thus composite photocatalysts with favorable formation of p-n junctions would enhance the charge separation by internal electric field.Moreover,photocatalysts are beneficial for providing more excited electrons at a time for achieving CO_(2) photoreduction at the surface region of the particles with higher density of radiation by concentrated solar energy.Subsequently,products from CO_(2) photoreduction,acting as sacrificial electron donors,improved hydrogen evolution in solar-mediated water splitting for prohibiting reverse reactions.
