基于SiGe合金的电子器件具有广阔的空间应用前景,但是也受到空间环境中粒子辐照损伤的威胁.本文通过蒙特卡罗模拟研究了1—1000 Me V质子对SiGe合金和SiGe/Si异质结构造成的位移损伤.结果表明,低能质子(1—100 Me V)在SiGe合金中主要通...基于SiGe合金的电子器件具有广阔的空间应用前景,但是也受到空间环境中粒子辐照损伤的威胁.本文通过蒙特卡罗模拟研究了1—1000 Me V质子对SiGe合金和SiGe/Si异质结构造成的位移损伤.结果表明,低能质子(1—100 Me V)在SiGe合金中主要通过库仑散射和弹性碰撞产生Si初级离位原子(primary knock-on atom,PKA)和Ge PKA,损伤能分布在质子射程末端形成一个明显的布拉格峰,而高能质子(300—1000 Me V)在SiGe合金中的非弹性碰撞更加显著,出现更多的PKA类型,损伤能主要分布在质子射程前端.同时,质子在SiGe/Si异质结构中的损伤能随质子能量的增大呈现出整体下降的趋势,反向入射质子(10 Me V和100 Me V)比正向入射质子在界面处Si基底一侧产生的损伤能更大,导致界面两侧的损伤能起伏更为剧烈,可能造成更加严重的位移损伤.此外,Ge含量会影响质子在SiGe合金中的PKA类型、损伤能分布和非电离能量损失,随着Ge含量的增大,高能质子在SiGe合金中的非电离能量损失逐渐变大,但是,Ge含量对质子在小尺寸SiGe/Si异质结构中总损伤能的影响不显著.总体上,这项工作说明了质子在SiGe合金和SiGe/Si异质结构中产生的位移损伤和质子能量密切相关,低能质子倾向于产生更多的自反冲原子,并在小尺寸SiGe/Si异质结构中产生位移损伤,为SiGe合金基电子器件的位移损伤效应研究和抗辐照加固技术提供了数据支持.展开更多
Ischemic stroke is the leading cause of death in China,accounting for approximately one-third of all stroke-associated deaths worldwide.Currently,thrombolysis is employed for ischemic strokes.However,due to the limite...Ischemic stroke is the leading cause of death in China,accounting for approximately one-third of all stroke-associated deaths worldwide.Currently,thrombolysis is employed for ischemic strokes.However,due to the limited therapeutic window of thrombolytic agents,most patients do not receive the drug at the right time.Moreover,these agents are associated with risks of hemorrhage and reperfusion damage.Herein,Angiopep-2(ANG)-black phosphorus(BP)-resveratrol(RES),a drug-loaded system,was used to deliver drugs across the blood–brain barrier(BBB).ANG-BP-RES has a uniform size,stable structure,good photothermal effect,and strong drug release ability under near-infrared(NIR)irradiation and acidic conditions.Furthermore,ANG-BP-RES can efficiently target the brain and improve BBB permeability,exerting a significant therapeutic effect against ischemic brain injury,especially after NIR irradiation.ANG-BP-RES is also biocompatible and shows minimal toxicity toward cells and tissues.This study offers novel insights into the therapeutic management of ischemic brain injury.展开更多
A high-activity and stable bifunctional oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)electrocatalyst is critical for seawater-based Zn-air batteries(ZABs).Herein,we report a wood-derived chainmail e...A high-activity and stable bifunctional oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)electrocatalyst is critical for seawater-based Zn-air batteries(ZABs).Herein,we report a wood-derived chainmail electrocatalyst containing defective nitrogen-doped carbon nanotubes encapsulating cobalt nanoparticles(Co@D-NCNT/CW)to enhance the ORR/OER activity and stability in seawater medium.During the preparation process,the introduction and removal of Zn increased the defect sites and pyridine N content in the carbon material,modulating charge distribution and influencing the adsorption and activation processes.The highly ordered open channels in Co@D-NCNT/CW promoted mass transfer of reactants and accelerated gas diffusion.The resultant chainmail electrocatalyst exhibited impressive bifunctional ORR and OER activities with an ultra-low gap of 0.67 V in sea water-based alkaline electrolyte.The Co@D-NCNT/CW-assembled seawater-based rechargeable liquid ZABs demonstrated a maximum power density of 245.3 mW cm^(-2)and a long-term cycling performance over 500 h.The seawater-based all-solid-state ZABs achieved the maximum power density of 48.2 mW cm^(-2)and stabilized over 30 h.Density functional theory revealed that the presence of defects and pyridine nitrogen in Co@D-NCNT/CW modulated the electronic structure of Co,optimizing the binding affinity of the Co sites with intermediates and weakening Cl^(-)adsorption.This work provides a new approach to preparing high-activity and stable ORR/OER electrocatalyst utilizing wood nanostructures,boosting the development of seawater-based ZABs.展开更多
文摘基于SiGe合金的电子器件具有广阔的空间应用前景,但是也受到空间环境中粒子辐照损伤的威胁.本文通过蒙特卡罗模拟研究了1—1000 Me V质子对SiGe合金和SiGe/Si异质结构造成的位移损伤.结果表明,低能质子(1—100 Me V)在SiGe合金中主要通过库仑散射和弹性碰撞产生Si初级离位原子(primary knock-on atom,PKA)和Ge PKA,损伤能分布在质子射程末端形成一个明显的布拉格峰,而高能质子(300—1000 Me V)在SiGe合金中的非弹性碰撞更加显著,出现更多的PKA类型,损伤能主要分布在质子射程前端.同时,质子在SiGe/Si异质结构中的损伤能随质子能量的增大呈现出整体下降的趋势,反向入射质子(10 Me V和100 Me V)比正向入射质子在界面处Si基底一侧产生的损伤能更大,导致界面两侧的损伤能起伏更为剧烈,可能造成更加严重的位移损伤.此外,Ge含量会影响质子在SiGe合金中的PKA类型、损伤能分布和非电离能量损失,随着Ge含量的增大,高能质子在SiGe合金中的非电离能量损失逐渐变大,但是,Ge含量对质子在小尺寸SiGe/Si异质结构中总损伤能的影响不显著.总体上,这项工作说明了质子在SiGe合金和SiGe/Si异质结构中产生的位移损伤和质子能量密切相关,低能质子倾向于产生更多的自反冲原子,并在小尺寸SiGe/Si异质结构中产生位移损伤,为SiGe合金基电子器件的位移损伤效应研究和抗辐照加固技术提供了数据支持.
基金funded by the National Natural Science Foundation of China (No. 81960334)the Guiding Plan of Xinjiang Production Construction Corps (No. 2022ZD007)+4 种基金the Science and Technology Innovation Leading Talents Program of Guangdong Province (No. 2019TX05C343)the Basic and Applied Basic Research Foundation of Guangdong Province-Regional Joint Fund-Key Projects (No. 2019B1515120043)the Project supported by the State Key Laboratory of Luminescence and Applications (No. SKLA-2020-03)the support from Instrumental Analysis Center of Shenzhen University (Xili Campus)Instrumental Analysis Center of Shihezi University.
文摘Ischemic stroke is the leading cause of death in China,accounting for approximately one-third of all stroke-associated deaths worldwide.Currently,thrombolysis is employed for ischemic strokes.However,due to the limited therapeutic window of thrombolytic agents,most patients do not receive the drug at the right time.Moreover,these agents are associated with risks of hemorrhage and reperfusion damage.Herein,Angiopep-2(ANG)-black phosphorus(BP)-resveratrol(RES),a drug-loaded system,was used to deliver drugs across the blood–brain barrier(BBB).ANG-BP-RES has a uniform size,stable structure,good photothermal effect,and strong drug release ability under near-infrared(NIR)irradiation and acidic conditions.Furthermore,ANG-BP-RES can efficiently target the brain and improve BBB permeability,exerting a significant therapeutic effect against ischemic brain injury,especially after NIR irradiation.ANG-BP-RES is also biocompatible and shows minimal toxicity toward cells and tissues.This study offers novel insights into the therapeutic management of ischemic brain injury.
基金financial support by the Excellent Youth Foundation of Shandong Province(No.ZR2022YQ22)National Natural Science Foundation of China(No.32101451)Youth Innovation Team Project of Shandong Province(No.2022KJ303)。
文摘A high-activity and stable bifunctional oxygen reduction reaction(ORR)and oxygen evolution reaction(OER)electrocatalyst is critical for seawater-based Zn-air batteries(ZABs).Herein,we report a wood-derived chainmail electrocatalyst containing defective nitrogen-doped carbon nanotubes encapsulating cobalt nanoparticles(Co@D-NCNT/CW)to enhance the ORR/OER activity and stability in seawater medium.During the preparation process,the introduction and removal of Zn increased the defect sites and pyridine N content in the carbon material,modulating charge distribution and influencing the adsorption and activation processes.The highly ordered open channels in Co@D-NCNT/CW promoted mass transfer of reactants and accelerated gas diffusion.The resultant chainmail electrocatalyst exhibited impressive bifunctional ORR and OER activities with an ultra-low gap of 0.67 V in sea water-based alkaline electrolyte.The Co@D-NCNT/CW-assembled seawater-based rechargeable liquid ZABs demonstrated a maximum power density of 245.3 mW cm^(-2)and a long-term cycling performance over 500 h.The seawater-based all-solid-state ZABs achieved the maximum power density of 48.2 mW cm^(-2)and stabilized over 30 h.Density functional theory revealed that the presence of defects and pyridine nitrogen in Co@D-NCNT/CW modulated the electronic structure of Co,optimizing the binding affinity of the Co sites with intermediates and weakening Cl^(-)adsorption.This work provides a new approach to preparing high-activity and stable ORR/OER electrocatalyst utilizing wood nanostructures,boosting the development of seawater-based ZABs.
