We propose a surface plasmon(SP) structure in electrically pumped multiple graphene-layer(MGL), and calculate the functions of dynamic conductivity and absorption coefficient. Meanwhile, the dependences of absorption ...We propose a surface plasmon(SP) structure in electrically pumped multiple graphene-layer(MGL), and calculate the functions of dynamic conductivity and absorption coefficient. Meanwhile, the dependences of absorption coefficient on different factors are simulated. SP can get gain when absorption coefficient is negative, and the SP gain can be enhanced by lowering temperature, applying high bias voltage and choosing the graphene with proper layer number and long momentum relaxation time. The study on SP gain is hopeful to be used in amplifiers and graphene-based plasmon devices.展开更多
BiVO_(4) scheelite is one of the few tetrahedra-based structures able to display vacancy-mediated oxide-ion conduction upon the use of an acceptor-doping strategy,leading to oxide-ion migration.In order to modulate th...BiVO_(4) scheelite is one of the few tetrahedra-based structures able to display vacancy-mediated oxide-ion conduction upon the use of an acceptor-doping strategy,leading to oxide-ion migration.In order to modulate the ionic migration process,it is of utmost importance to understand the different parameters affecting it.Here we review phase formation,oxygen vacancy stabilization,and migration for a wide variety of acceptor metal dopants in scheelite BiVO_(4).Among them,Ca^(2+)-doped materials present the widest solid-solution range,leading to optimized oxide-ion conductivities at moderately high temperatures(σb:∼10-3 S cm^(-1) at 500°C),mainly as a result of their smaller size mismatch with Bi3+and lower oxygen vacancy defect energy.The results gathered herein provide a useful guide for designing new oxide-ion conductors and tailoring oxide conductivity through the proper selection of doping agents according to several criteria,such as the oxygen defect formation energy,atom size mismatch,polarizability,and bond-dissociation energy with oxygen.展开更多
The effects of isovalent Sb substitution on the superconducting properties of the Ca0.88La0.12Fe2（As1-ySby）2 system have been studied through electrical resistivity measure- ments. It is seen that the antiferromagne...The effects of isovalent Sb substitution on the superconducting properties of the Ca0.88La0.12Fe2（As1-ySby）2 system have been studied through electrical resistivity measure- ments. It is seen that the antiferromagnetic or structural transition is suppressed with Sb content, and a high-To superconducting phase, accompanied by a low-Tc phase, emerges at 0.02 ≤y ≤ 0.06. In this intermediate-doping regime, normal-state transport shows non-Fermi-liquid-like behaviors with nearly T-linear resistivity above the high-Tc phase. With further Sb doping, this high-Tc phase abruptly vanishes for y 〉 0.06 and the conventional Fermi liquid is restored, while the low-T,, phase remains robust against Sb inlpurities. The coincidence of the high-Tc phase and non-Fermi liquid transport behaviors in the intermediate Sb-doping regime suggests that AFM fluctuations play an important role in the observed non-Fermi liquid behaviors, which may be intimately related to the unusual nonbulk high-Tc phase in this system.展开更多
Interference with calcium homeostasis provokes tumor cell death and immune response,providing a novel direction for tumor immunotherapy as a promising cancer treatment strategy.Nevertheless,most reported Ca^(2+)-overl...Interference with calcium homeostasis provokes tumor cell death and immune response,providing a novel direction for tumor immunotherapy as a promising cancer treatment strategy.Nevertheless,most reported Ca^(2+)-overloaded nanoinducers encounter challenges such as intricate preparation procedures,safety concerns arising from inorganic material input,and limited anti-tumor efficiency.Herein,we synthesized a biocompatible and pH-sensitive Ca-doped cyclodextrin metal-organic framework(Ca/K-MOF)as a carrier,which was then loaded with photosensitizer hypericin(HY)via a simple one-pot synthesis to form HY@Ca/K-MOF.To enhance the stability both in vitro and in vivo,we coated HY@Ca/K-MOF with a hydrophilic layer of ^(PEG)(^(PEG)HY@Ca/K-MOF).When exposed to 590 nm photoirradiation,^(PEG)HY@Ca/K-MOF,with its pH-responsive dissociation,the Ca^(2+)and HY mediators released at the tumor site share the responsibility of triggering intracellular Ca^(2+)disturbances,which amplified the production of reactive oxygen species(ROS)and led to mitochondrial calcium overload through modulating mitochondrial MICU1 function.Under photocontrol,this interplay between ROS generation and mitochondrial calcium overload created a bidirectional amplification effect,where each process reinforced the other,subsequently eliciting a pyroptosis-evoked immune response.Significantly,this newly constructed delivery platform effectively suppressed both primary and distant tumors without the need for additional immunological interventions.In summary,this Ca^(2+)-doped MOF-based nanomaterial provides a promising approach for efficient tumor photo-controlled mitochondrial Ca^(2+)overload-pyroptosis immunotherapy.展开更多
基金supported by the National Natural Science Foundation of China(No.61001018)the Natural Science Foundation of Shandong Province of China(No.ZR2012FM011)+3 种基金the Project of Shandong Province Higher Educational Science and Technology Program(No.J11LG20)the Qingdao Science&Technology Project(No.11-2-4-4-(8)-jch)the Qingdao Economic & Technical Development Zone Science & Technology Project(No.2013-1-64)the Shandong University of Science and Technology Foundation in China(No.YC140108)
文摘We propose a surface plasmon(SP) structure in electrically pumped multiple graphene-layer(MGL), and calculate the functions of dynamic conductivity and absorption coefficient. Meanwhile, the dependences of absorption coefficient on different factors are simulated. SP can get gain when absorption coefficient is negative, and the SP gain can be enhanced by lowering temperature, applying high bias voltage and choosing the graphene with proper layer number and long momentum relaxation time. The study on SP gain is hopeful to be used in amplifiers and graphene-based plasmon devices.
基金The National Natural Science Foundation of China(no.21850410458 and 22005073)Guangxi Natural Science Foundation(no.2019GXNSFBA245010,2020GXNSFAA297050,and 2019GXNSFGA245006)Open Foundation of Key Laboratory of New Processing Technology for Nonferrous Metal&Materials,Ministry of Education/Guangxi Key Laboratory of Optical and Electronic Materials and Devices(20AA-1)are acknowledged for financial support.The DFT calculation work in this research was carried out at the Shanxi Supercomputing Center,and the calculations were performed on TianHe-2.
文摘BiVO_(4) scheelite is one of the few tetrahedra-based structures able to display vacancy-mediated oxide-ion conduction upon the use of an acceptor-doping strategy,leading to oxide-ion migration.In order to modulate the ionic migration process,it is of utmost importance to understand the different parameters affecting it.Here we review phase formation,oxygen vacancy stabilization,and migration for a wide variety of acceptor metal dopants in scheelite BiVO_(4).Among them,Ca^(2+)-doped materials present the widest solid-solution range,leading to optimized oxide-ion conductivities at moderately high temperatures(σb:∼10-3 S cm^(-1) at 500°C),mainly as a result of their smaller size mismatch with Bi3+and lower oxygen vacancy defect energy.The results gathered herein provide a useful guide for designing new oxide-ion conductors and tailoring oxide conductivity through the proper selection of doping agents according to several criteria,such as the oxygen defect formation energy,atom size mismatch,polarizability,and bond-dissociation energy with oxygen.
基金This work was supported by tile National Natural Science Foundation of China （Grant Nos. U1432135, 11674054, 11474080, and 11611140101） and the Scientific Research Foundation of Graduate School of Southeast University （Grant No. YBJJ1621）. X. Xu would also like to acknowledge the National Key Basic Research Program of China （Grant No. 2014CB648400） and the support from the Distinguished Young Scientist Funds of Zhejiang Province （No. LR14A040001）.
文摘The effects of isovalent Sb substitution on the superconducting properties of the Ca0.88La0.12Fe2（As1-ySby）2 system have been studied through electrical resistivity measure- ments. It is seen that the antiferromagnetic or structural transition is suppressed with Sb content, and a high-To superconducting phase, accompanied by a low-Tc phase, emerges at 0.02 ≤y ≤ 0.06. In this intermediate-doping regime, normal-state transport shows non-Fermi-liquid-like behaviors with nearly T-linear resistivity above the high-Tc phase. With further Sb doping, this high-Tc phase abruptly vanishes for y 〉 0.06 and the conventional Fermi liquid is restored, while the low-T,, phase remains robust against Sb inlpurities. The coincidence of the high-Tc phase and non-Fermi liquid transport behaviors in the intermediate Sb-doping regime suggests that AFM fluctuations play an important role in the observed non-Fermi liquid behaviors, which may be intimately related to the unusual nonbulk high-Tc phase in this system.
基金supported by the Centrally Guided Local Science and Technology Development Project(No.2024ZYD0043,China)the Chongqing Natural Science Foundation(No.CSTB2022NSCQ-MSX0350,China)+2 种基金the National Natural Science Foundation of China(No.82405161)the Sichuan Province Joint Fund for Science and Education(No.2024NSFSC2124,China)the Xinglin Scholar Research Promotion Project of Chengdu University of TCM(Nos.BSZ2024002 and QJRC2024018,China).
文摘Interference with calcium homeostasis provokes tumor cell death and immune response,providing a novel direction for tumor immunotherapy as a promising cancer treatment strategy.Nevertheless,most reported Ca^(2+)-overloaded nanoinducers encounter challenges such as intricate preparation procedures,safety concerns arising from inorganic material input,and limited anti-tumor efficiency.Herein,we synthesized a biocompatible and pH-sensitive Ca-doped cyclodextrin metal-organic framework(Ca/K-MOF)as a carrier,which was then loaded with photosensitizer hypericin(HY)via a simple one-pot synthesis to form HY@Ca/K-MOF.To enhance the stability both in vitro and in vivo,we coated HY@Ca/K-MOF with a hydrophilic layer of ^(PEG)(^(PEG)HY@Ca/K-MOF).When exposed to 590 nm photoirradiation,^(PEG)HY@Ca/K-MOF,with its pH-responsive dissociation,the Ca^(2+)and HY mediators released at the tumor site share the responsibility of triggering intracellular Ca^(2+)disturbances,which amplified the production of reactive oxygen species(ROS)and led to mitochondrial calcium overload through modulating mitochondrial MICU1 function.Under photocontrol,this interplay between ROS generation and mitochondrial calcium overload created a bidirectional amplification effect,where each process reinforced the other,subsequently eliciting a pyroptosis-evoked immune response.Significantly,this newly constructed delivery platform effectively suppressed both primary and distant tumors without the need for additional immunological interventions.In summary,this Ca^(2+)-doped MOF-based nanomaterial provides a promising approach for efficient tumor photo-controlled mitochondrial Ca^(2+)overload-pyroptosis immunotherapy.
