A zinc sulfate open framework matrix,[Zn(SO_4)(DMSO)](1),was synthesized by solvothermal evaporationusing dimethyl sulfoxide(DMSO)as the solvent.A compositeP@1,which exhibits fluorescence and room tempera-ture phospho...A zinc sulfate open framework matrix,[Zn(SO_4)(DMSO)](1),was synthesized by solvothermal evaporationusing dimethyl sulfoxide(DMSO)as the solvent.A compositeP@1,which exhibits fluorescence and room tempera-ture phosphorescence(RTP)properties,was prepared by doping 2,6-naphthalic acid(P)into matrix1at a low con-centration.P@1emitted a green RTP that was visible to the naked eye and lasted for approximately 2 s.P@1exhib-ited selective phosphorescence enhancement response towards Pb^(2+),with a detection limit of 2.52μmol·L^(-1).Themain detection mechanism is the Pb—O coordination-induced phosphorescence enhancement in the system.Inter-estingly,P@1also functioned as a dual-channel probe for the rapid detection of Fe^(3+)ions through fluorescencequenching with a detection limit of 0.038μmol·L^(-1).The recognition mechanism may be attributed to the competi-tive energy absorption betweenP@1and Fe^(3+)ions.CCDC:2388502,1.展开更多
β-Ga_(2)O_(3)以其较高的导带底(Conduction Band Minimum,CBM)和较低的价带顶(Valence Band Maximum,VBM),赋予其光生电子和空穴较强的还原与氧化能力,但其宽禁带和高载流子复合率限制了在光催化中的应用.金属离子掺杂被认为是提升光...β-Ga_(2)O_(3)以其较高的导带底(Conduction Band Minimum,CBM)和较低的价带顶(Valence Band Maximum,VBM),赋予其光生电子和空穴较强的还原与氧化能力,但其宽禁带和高载流子复合率限制了在光催化中的应用.金属离子掺杂被认为是提升光催化性能的有效途径.本文基于第一性原理系统研究了Sr、Ba、V、Nb、Ta等二十种元素掺杂对β-Ga_(2)O_(3)光催化性能的影响,研究发现:Sr、Nb、Ta、Mn、Fe、Zn、Hg七种元素掺杂β-Ga_(2)O_(3)后,材料除能保持合适的带边位置外,还具有更高的电子空穴分离效率以及更低的形成能,表明这些元素的引入可有效提升β-Ga_(2)O_(3)光催化效率;Nb、Ta掺杂可显著增强材料在红外光区的吸收,Mn、Fe掺杂则显著提升材料在紫外和可见光区的吸收能力,其中,Nb在0.5 eV处光吸收系数高达1.38×10^(5)cm^(−1),Mn、Fe掺杂在3 eV处光吸收系数可达1×10^(5)cm^(−1),在不同波段均呈现出良好的光吸收能力.此外,Hg掺杂表现出跨红外至深紫外的宽波段增强效果,Hg掺杂后,电子空穴相对有效质量高达109,说明Hg掺杂显著提升载流子分离能力,同时由于其在宽波段显著增强的光吸收效果,因此,Hg可作为β-Ga_(2)O_(3)在光催化制氢中理想的金属掺杂元素,以上研究结果为β-Ga_(2)O_(3)光催化分解水制氢研究提供了价值参考.展开更多
文摘A zinc sulfate open framework matrix,[Zn(SO_4)(DMSO)](1),was synthesized by solvothermal evaporationusing dimethyl sulfoxide(DMSO)as the solvent.A compositeP@1,which exhibits fluorescence and room tempera-ture phosphorescence(RTP)properties,was prepared by doping 2,6-naphthalic acid(P)into matrix1at a low con-centration.P@1emitted a green RTP that was visible to the naked eye and lasted for approximately 2 s.P@1exhib-ited selective phosphorescence enhancement response towards Pb^(2+),with a detection limit of 2.52μmol·L^(-1).Themain detection mechanism is the Pb—O coordination-induced phosphorescence enhancement in the system.Inter-estingly,P@1also functioned as a dual-channel probe for the rapid detection of Fe^(3+)ions through fluorescencequenching with a detection limit of 0.038μmol·L^(-1).The recognition mechanism may be attributed to the competi-tive energy absorption betweenP@1and Fe^(3+)ions.CCDC:2388502,1.
文摘β-Ga_(2)O_(3)以其较高的导带底(Conduction Band Minimum,CBM)和较低的价带顶(Valence Band Maximum,VBM),赋予其光生电子和空穴较强的还原与氧化能力,但其宽禁带和高载流子复合率限制了在光催化中的应用.金属离子掺杂被认为是提升光催化性能的有效途径.本文基于第一性原理系统研究了Sr、Ba、V、Nb、Ta等二十种元素掺杂对β-Ga_(2)O_(3)光催化性能的影响,研究发现:Sr、Nb、Ta、Mn、Fe、Zn、Hg七种元素掺杂β-Ga_(2)O_(3)后,材料除能保持合适的带边位置外,还具有更高的电子空穴分离效率以及更低的形成能,表明这些元素的引入可有效提升β-Ga_(2)O_(3)光催化效率;Nb、Ta掺杂可显著增强材料在红外光区的吸收,Mn、Fe掺杂则显著提升材料在紫外和可见光区的吸收能力,其中,Nb在0.5 eV处光吸收系数高达1.38×10^(5)cm^(−1),Mn、Fe掺杂在3 eV处光吸收系数可达1×10^(5)cm^(−1),在不同波段均呈现出良好的光吸收能力.此外,Hg掺杂表现出跨红外至深紫外的宽波段增强效果,Hg掺杂后,电子空穴相对有效质量高达109,说明Hg掺杂显著提升载流子分离能力,同时由于其在宽波段显著增强的光吸收效果,因此,Hg可作为β-Ga_(2)O_(3)在光催化制氢中理想的金属掺杂元素,以上研究结果为β-Ga_(2)O_(3)光催化分解水制氢研究提供了价值参考.
