Phase-pure t-NdVO_4 nanocrystals with different shapes have been synthesized by facile and repeatable hydrothermal methods. The as-synthesized t-NdVO_4 nanoparticles were characterized by various techniques of X-ray d...Phase-pure t-NdVO_4 nanocrystals with different shapes have been synthesized by facile and repeatable hydrothermal methods. The as-synthesized t-NdVO_4 nanoparticles were characterized by various techniques of X-ray diffraction（XRD）. scanning electron microscope（SEM） and transmission electron microscope（TEM）. The growth process and assembly behavior of t-NdVO_4 nanorod arrays were investigated. The results show that the morphology of t-NdV04 nanocrystals is greatly related to the pH value of precursor solution and that strong basic solution is not in favor of the formation of t-NdVO_4 nanoparticles. Due to the strong adhesive action and stabilization of OH^-ions to some crystal faces of NdVO_4, neodymium vanadate crystallite grows into oriented short nanorods and then into nanorod arrays. The shape, crystalline and dimension of NdVO_4 nanocrystals can be effectively governed in our work.展开更多
Metal halide perovskites,particularly lead-based compounds,manifest great potential in X-ray detection due to their exceptional light absorption coefficients,superior carrier mobility and cost-effective preparation me...Metal halide perovskites,particularly lead-based compounds,manifest great potential in X-ray detection due to their exceptional light absorption coefficients,superior carrier mobility and cost-effective preparation methods.Despite recent significant advancements,the limitations of lead toxicity hinder their further application and encourage the exploration of environmentally friendly alternatives.Herein,a novel lead-free two-dimensional(2D)copper-based halide perovskite(2FEA)_(2)CuCl_(4)(2FEA=2,2-difluoroethylamine)single crystal is developed,which exhibits a highly sensitive response to X-ray illumination.In particular,an inch-sized single crystal of(2FEA)_(2)CuCl_(4)with dimensions of up to 30×28×0.5 mm^(3)is grown using a low-cost cooling crystallization method.Direct X-ray detectors fabricated from these single crystals exhibited an exceptionally high sensitivity of 1106.44μC Gy_(air)^(−1)cm^(−2)at 10 V bias,approximately 43 times higher than that of the conventional radiation-sensitive semiconductor α-Se(~25μC Gy_(air)^(−1)cm^(−2)).Furthermore,(2FEA)2CuCl4 exhibits a stable baseline with a low dark current drift of 5.056×10^(−7)nA cm^(−1)s^(−1)V^(−1)and a low limit of detection of 130.1 nGy_(air)s^(−1)at 10 V bias.These findings manifest the great potential of 2D copper-based hybrid perovskites for next-generation highly sensitive X-ray detection,which sheds light on the rational crystal design of“green”radiation-sensitive hybrid perovskites.展开更多
基金Project supported by the National Natural Science Foundation(NSF)of China(51202066)the New Century Excellent Talents supported by the China Education Ministry(NCET-13-0784)+6 种基金the Hunan Province graduate Research and Innovation Project(grants CX2016B540)the Undergraduate Research and Innovation Program of Hunan University of Science and Technology(SYZ2016050)the Scientific Research Fund of Hunan Provincial Education Department(12A047)the Research Project of Science and Technology Department of Hunan Province(2013SK3162)the State Key Laboratory Program of Rare Earth Resource Utilization of China(RERU2013019)the State Key Laboratory Programs of Inorganic Synthesis and Preparative Chemistry of China(2013-26)the Key Laboratory Program of Ecological Impacts of Hydraulic-projects and Restoration of Aquatic Ecosystem in Ministry of Water Resources of China(2013001)
文摘Phase-pure t-NdVO_4 nanocrystals with different shapes have been synthesized by facile and repeatable hydrothermal methods. The as-synthesized t-NdVO_4 nanoparticles were characterized by various techniques of X-ray diffraction（XRD）. scanning electron microscope（SEM） and transmission electron microscope（TEM）. The growth process and assembly behavior of t-NdVO_4 nanorod arrays were investigated. The results show that the morphology of t-NdV04 nanocrystals is greatly related to the pH value of precursor solution and that strong basic solution is not in favor of the formation of t-NdVO_4 nanoparticles. Due to the strong adhesive action and stabilization of OH^-ions to some crystal faces of NdVO_4, neodymium vanadate crystallite grows into oriented short nanorods and then into nanorod arrays. The shape, crystalline and dimension of NdVO_4 nanocrystals can be effectively governed in our work.
基金supported by the National Natural Science Foundation of China(52473283,22193042,22125110,22435005,and U21A2069)the Natural Science Foundation of Fujian Province(2024J010037).
文摘Metal halide perovskites,particularly lead-based compounds,manifest great potential in X-ray detection due to their exceptional light absorption coefficients,superior carrier mobility and cost-effective preparation methods.Despite recent significant advancements,the limitations of lead toxicity hinder their further application and encourage the exploration of environmentally friendly alternatives.Herein,a novel lead-free two-dimensional(2D)copper-based halide perovskite(2FEA)_(2)CuCl_(4)(2FEA=2,2-difluoroethylamine)single crystal is developed,which exhibits a highly sensitive response to X-ray illumination.In particular,an inch-sized single crystal of(2FEA)_(2)CuCl_(4)with dimensions of up to 30×28×0.5 mm^(3)is grown using a low-cost cooling crystallization method.Direct X-ray detectors fabricated from these single crystals exhibited an exceptionally high sensitivity of 1106.44μC Gy_(air)^(−1)cm^(−2)at 10 V bias,approximately 43 times higher than that of the conventional radiation-sensitive semiconductor α-Se(~25μC Gy_(air)^(−1)cm^(−2)).Furthermore,(2FEA)2CuCl4 exhibits a stable baseline with a low dark current drift of 5.056×10^(−7)nA cm^(−1)s^(−1)V^(−1)and a low limit of detection of 130.1 nGy_(air)s^(−1)at 10 V bias.These findings manifest the great potential of 2D copper-based hybrid perovskites for next-generation highly sensitive X-ray detection,which sheds light on the rational crystal design of“green”radiation-sensitive hybrid perovskites.
基金supported by the National Natural Science Foundation of China(22193042,22125110,21833010,22075285,21875251,21921001,and U21A2069)the Key Research Program of Frontier Sciences of Chinese Academy of Sciences(ZDBS-LY-SLH024)the Youth Innovation Promotion of Chinese Academy of Sciences(2020307)。
