Photoluminescence(PL)is one of the most important properties of metal nanoclusters(NCs).Achieving effi⁃cient white light emission in metal NCs with a precise structures is important for practical applications but rema...Photoluminescence(PL)is one of the most important properties of metal nanoclusters(NCs).Achieving effi⁃cient white light emission in metal NCs with a precise structures is important for practical applications but remains a great challenge.Here,we report the efficient white emission from Au_(10) NCs by elaborately deploying the surface chemistry engi⁃neering strategy.Specifically,the bis-aldehyde ligands of 4-hydroxyisophthalaldehyde(HOA)are decorated on the surface of Au_(10)(SG)_(10) NCs(glutathione denoted as SG)through the cross-linking reaction of imine bonds(-CH==N-).The combination of 477 nm blue emission from HOA ligands and 620 nm orange-yellow emission from Au_(10)(SG)_(10) NCs generates white-light emission in HOA-Au_(10)(SG)_(10) NCs in the solvent mixture of ethanol and water.More importantly,dynamic color tuning from blue light to yellow light is achieved by controlling the volume fraction of ethanol in the solvent mixture.In addi⁃tion,the as-formed imine bonds significantly improve the structural rigidity of HOA-Au_(10)(SG)_(10) NCs,resulting in the 51.2%absolute photoluminescence quantum yield(PLQY)of white emission.The present study exemplifies the paradigm to control the emission color and improve the PLQY of metal NCs through rational surface chemistry engineering.展开更多
Solar-driven interfacial water purification(SDIWP)has emerged as a green,cost-effective,and sustainable technology for waste/sea water treatment.However,at present,innovative smart water treatment systems that enable ...Solar-driven interfacial water purification(SDIWP)has emerged as a green,cost-effective,and sustainable technology for waste/sea water treatment.However,at present,innovative smart water treatment systems that enable high-efficiency water purification through multiform solar schemes are rare.Herein,we report a light-propelled photocatalytic evaporator based on semi-metallic reduced graphene oxide(RGO)/titanium carbide MXene-titanium dioxide(Ti_(3)C_(2)T_(x)-TiO_(2))ternary hybrid foams for multischeme SDIWP.The RGO/Ti_(3)C_(2)T_(x)-TiO_(2)foam is prepared by freeze-drying induced selfassembly(FDISA)of Ti_(3)C_(2)T_(x)and graphene oxide(GO)nanosheets by which an in-situ redox reaction between Ti_(3)C_(2)T_(x)and GO nanosheets occurs and TiO_(2)nanoparticles are generated simultaneously.The synergistic effect leads to the formation of the semimetallic RGO/Ti_(3)C_(2)T_(x)-TiO_(2)framework with the Ti–O-C covalent bonding between RGO and Ti_(3)C_(2)T_(x).Under light irradiation,the photogenerated carriers in RGO/Ti_(3)C_(2)T_(x)-TiO_(2)can occupy the quantum-confined graphene-like states in RGO with an average lifetime of 0.8 ps,this value is 2 orders of magnitude shorter than that of GO and Ti_(3)C_(2)T_(x).As a result,the RGO/Ti_(3)C_(2)T_(x)-TiO_(2)foam shows photocatalytic degradation activity and photothermal conversion ability,enabling multi-scheme SDIWP.Owing to its excellent photothermal properties and quantum-confined superfluidic structures,the RGO/Ti_(3)C_(2)T_(x)-TiO_(2)foam exhibits superior vapor generation performance(1.72 kg m^(–2)h^(–1)).Furthermore,the photocatalytic evaporator can be remotely manipulated as a floating robot for water treatment through programmable light navigation via photothermal Marangoni propulsion.This work provides a new approach for developing robotic SDIWP systems.展开更多
文摘Photoluminescence(PL)is one of the most important properties of metal nanoclusters(NCs).Achieving effi⁃cient white light emission in metal NCs with a precise structures is important for practical applications but remains a great challenge.Here,we report the efficient white emission from Au_(10) NCs by elaborately deploying the surface chemistry engi⁃neering strategy.Specifically,the bis-aldehyde ligands of 4-hydroxyisophthalaldehyde(HOA)are decorated on the surface of Au_(10)(SG)_(10) NCs(glutathione denoted as SG)through the cross-linking reaction of imine bonds(-CH==N-).The combination of 477 nm blue emission from HOA ligands and 620 nm orange-yellow emission from Au_(10)(SG)_(10) NCs generates white-light emission in HOA-Au_(10)(SG)_(10) NCs in the solvent mixture of ethanol and water.More importantly,dynamic color tuning from blue light to yellow light is achieved by controlling the volume fraction of ethanol in the solvent mixture.In addi⁃tion,the as-formed imine bonds significantly improve the structural rigidity of HOA-Au_(10)(SG)_(10) NCs,resulting in the 51.2%absolute photoluminescence quantum yield(PLQY)of white emission.The present study exemplifies the paradigm to control the emission color and improve the PLQY of metal NCs through rational surface chemistry engineering.
基金supported in part by the National Key Research and Development Program of China under Grant No.2022YFB4600400the National Natural Science Foundation of China under Grant Nos.62275100 and T2325014+2 种基金the Natural Science Foundation of Jilin Province under Grant No.20230101350JC and YDZJ202402001CXJDthe National Ten Thousand Talent Program for Young Top-notch Talentsthe Fundamental Research Funds for the Central Universities.
文摘Solar-driven interfacial water purification(SDIWP)has emerged as a green,cost-effective,and sustainable technology for waste/sea water treatment.However,at present,innovative smart water treatment systems that enable high-efficiency water purification through multiform solar schemes are rare.Herein,we report a light-propelled photocatalytic evaporator based on semi-metallic reduced graphene oxide(RGO)/titanium carbide MXene-titanium dioxide(Ti_(3)C_(2)T_(x)-TiO_(2))ternary hybrid foams for multischeme SDIWP.The RGO/Ti_(3)C_(2)T_(x)-TiO_(2)foam is prepared by freeze-drying induced selfassembly(FDISA)of Ti_(3)C_(2)T_(x)and graphene oxide(GO)nanosheets by which an in-situ redox reaction between Ti_(3)C_(2)T_(x)and GO nanosheets occurs and TiO_(2)nanoparticles are generated simultaneously.The synergistic effect leads to the formation of the semimetallic RGO/Ti_(3)C_(2)T_(x)-TiO_(2)framework with the Ti–O-C covalent bonding between RGO and Ti_(3)C_(2)T_(x).Under light irradiation,the photogenerated carriers in RGO/Ti_(3)C_(2)T_(x)-TiO_(2)can occupy the quantum-confined graphene-like states in RGO with an average lifetime of 0.8 ps,this value is 2 orders of magnitude shorter than that of GO and Ti_(3)C_(2)T_(x).As a result,the RGO/Ti_(3)C_(2)T_(x)-TiO_(2)foam shows photocatalytic degradation activity and photothermal conversion ability,enabling multi-scheme SDIWP.Owing to its excellent photothermal properties and quantum-confined superfluidic structures,the RGO/Ti_(3)C_(2)T_(x)-TiO_(2)foam exhibits superior vapor generation performance(1.72 kg m^(–2)h^(–1)).Furthermore,the photocatalytic evaporator can be remotely manipulated as a floating robot for water treatment through programmable light navigation via photothermal Marangoni propulsion.This work provides a new approach for developing robotic SDIWP systems.
