Transparent conductive graphene films are fabricated by the transfer printing of graphene aqueous dispersion followed by hydrohalic acids and thermal reduction. Results indicate that the graphene film reduced by hydro...Transparent conductive graphene films are fabricated by the transfer printing of graphene aqueous dispersion followed by hydrohalic acids and thermal reduction. Results indicate that the graphene film reduced by hydroiodic acid （HI） reduction combined with thermal treatment shows a higher electrical conductivity than that reduced only by thermal treatment at the same transparency. A film with a sheet resistance of - 2400 D./sq at a transparency over 72% is obtained at a typical wavelength of 550 nm.展开更多
Perovskite nanoplatelets(NPLs)display excellent photoluminescence(PL)properties and unique shape features,including thickness-dependent bandgap luminescence.However,perovskite NPLs,especially those based on iodides,ex...Perovskite nanoplatelets(NPLs)display excellent photoluminescence(PL)properties and unique shape features,including thickness-dependent bandgap luminescence.However,perovskite NPLs,especially those based on iodides,exhibit poor spectral and phase stability.Herein,we propose a facile strategy to achieve a near-unity PL quantum yield(QY)and high stability of CsPbI_(3) NPLs by employing hydrogen iodate(HI)for in situ etching-assisted surface modification of the short-chain strongly bound ligand dodecylamine(DDDAm).It is found that HI can etch off the incomplete octahedron[PbI_(6)]^(4-)on the surface of CsPbI_(3) NPLs.Simultaneously,the excessive use of I^(-)ions and the introduction of DDDAm ligands effectively passivate the surface defects of NPLs,significantly improving their radiation recombination rate.As a result,the as-prepared CsPbI_(3) NPLs exhibit up to 95%PL QY,maintaining PL characteristics even after 87 days of exposure to the atmospheric environment.Conversely,untreated CsPbI_(3) NPLs display poor phase stability and transform into non-PL features(δ-CsPbI_(3))after 21 days.As a proof of concept,we fabricated perovskite LEDs(PeLEDs)using these treated CsPbI_(3) NPLs as luminescent layers for calibration.These PeLEDs showcase bright electroluminescence at 600 nm,with a full width at half maximum of 22 nm and an external quantum efficiency of 2.98%.The effective synthesis strategy using HI^(-)assisted ligand treatment presented here is expected to be extended to the synthesis of other perovskite NPLs,thereby accelerating the integration of perovskite NPLs in optoelectronic technology.展开更多
Bismuth-based compounds have been regarded as an important class of visible-light photocatalysts due to their special electronic structures. In this paper, iodide ions are introduced to modify bismuth-based compound,...Bismuth-based compounds have been regarded as an important class of visible-light photocatalysts due to their special electronic structures. In this paper, iodide ions are introduced to modify bismuth-based compound, Bi（24）O（31）Br（10）, forming a Bi（24）O（31）Br（10）/BiOI heterojunction structure. A significant enhancement of photocatalytic activity compared to the parent compounds is observed in de-coloration of rhodamine B（Rh.B） solution. The improved photocatalytic property of Bi（24）O（31）Br（10）/BiOI heterojunction is ascribed to the unique electronic structure consisting of complementary band structures of BiOI and Bi（24）O（31）Br（10）.Iodide ions are regarded as an effective reagent to construct bismuth-based photocatalytic heterojunctions with improved photocatalytic activity.展开更多
基金Project supported by the National Key Basic Research Program of China (Grant Nos.2012CB626800 and 2010CB934700)the National Natural Science Foundation of China (Grant Nos.51073115,51003072,51173127,and 51273144)
文摘Transparent conductive graphene films are fabricated by the transfer printing of graphene aqueous dispersion followed by hydrohalic acids and thermal reduction. Results indicate that the graphene film reduced by hydroiodic acid （HI） reduction combined with thermal treatment shows a higher electrical conductivity than that reduced only by thermal treatment at the same transparency. A film with a sheet resistance of - 2400 D./sq at a transparency over 72% is obtained at a typical wavelength of 550 nm.
基金supported by the Outstanding Youth Fund of the Guangxi Natural Science Foundation(2022GXNSFFA035032)the National Natural Science Foundation of China(62165001,12174075)the special fund for“Guangxi Bagui Scholars”,and the“Guangxi Hundred-Talent Program”.
文摘Perovskite nanoplatelets(NPLs)display excellent photoluminescence(PL)properties and unique shape features,including thickness-dependent bandgap luminescence.However,perovskite NPLs,especially those based on iodides,exhibit poor spectral and phase stability.Herein,we propose a facile strategy to achieve a near-unity PL quantum yield(QY)and high stability of CsPbI_(3) NPLs by employing hydrogen iodate(HI)for in situ etching-assisted surface modification of the short-chain strongly bound ligand dodecylamine(DDDAm).It is found that HI can etch off the incomplete octahedron[PbI_(6)]^(4-)on the surface of CsPbI_(3) NPLs.Simultaneously,the excessive use of I^(-)ions and the introduction of DDDAm ligands effectively passivate the surface defects of NPLs,significantly improving their radiation recombination rate.As a result,the as-prepared CsPbI_(3) NPLs exhibit up to 95%PL QY,maintaining PL characteristics even after 87 days of exposure to the atmospheric environment.Conversely,untreated CsPbI_(3) NPLs display poor phase stability and transform into non-PL features(δ-CsPbI_(3))after 21 days.As a proof of concept,we fabricated perovskite LEDs(PeLEDs)using these treated CsPbI_(3) NPLs as luminescent layers for calibration.These PeLEDs showcase bright electroluminescence at 600 nm,with a full width at half maximum of 22 nm and an external quantum efficiency of 2.98%.The effective synthesis strategy using HI^(-)assisted ligand treatment presented here is expected to be extended to the synthesis of other perovskite NPLs,thereby accelerating the integration of perovskite NPLs in optoelectronic technology.
基金supported by the National Natural Science Foundation of China (Grant Nos. 51072012 and 51272015)partially supported by the Ph.D. Research Startup Foundation of Henan Normal University (No. 5101029170290)the Australian Research Council through a Discovery Project (DP140102581)
文摘Bismuth-based compounds have been regarded as an important class of visible-light photocatalysts due to their special electronic structures. In this paper, iodide ions are introduced to modify bismuth-based compound, Bi（24）O（31）Br（10）, forming a Bi（24）O（31）Br（10）/BiOI heterojunction structure. A significant enhancement of photocatalytic activity compared to the parent compounds is observed in de-coloration of rhodamine B（Rh.B） solution. The improved photocatalytic property of Bi（24）O（31）Br（10）/BiOI heterojunction is ascribed to the unique electronic structure consisting of complementary band structures of BiOI and Bi（24）O（31）Br（10）.Iodide ions are regarded as an effective reagent to construct bismuth-based photocatalytic heterojunctions with improved photocatalytic activity.
