Inorganic Cs_(2)SnI_(6) perovskite has exhibited substantial potential for light harvesting due to its exceptional optoelectronic properties and remarkable stability in ambient conditions.The charge transport characte...Inorganic Cs_(2)SnI_(6) perovskite has exhibited substantial potential for light harvesting due to its exceptional optoelectronic properties and remarkable stability in ambient conditions.The charge transport characteristics within perovskite films are subject to modulation by various factors,including crystalline orientation,morphology,and crystalline quality.Achieving preferred crystalline orientation and film morphology via a solution-based process is challenging for Cs_(2)SnI_(6) films.In this work,we employed thiourea as an additive to optimize crystal orientation,enhance film morphology,promote crystallization,and achieve phase purity.Thiourea lowers the surface energy of the(222)plane along the(111)direction,confirmed by x-ray diffraction,x-ray photoelectron spectroscopy,ultraviolet photoelectron spectroscopy studies,and density functional theory calculations.Varying thiourea concentration enables a bandgap tuning of Cs_(2)SnI_(6) from 1.52 eV to1.07 eV.This approach provides a novel method for utilizing Cs_(2)SnI_(6) films in high-performance optoelectronic devices.展开更多
The systematic method for constructing Lewis representations is a method for representing chemical bonds between atoms in a molecule. It uses symbols to represent the valence electrons of the atoms involved in the bon...The systematic method for constructing Lewis representations is a method for representing chemical bonds between atoms in a molecule. It uses symbols to represent the valence electrons of the atoms involved in the bond. Using a number of rules in a defined order, it is often better suited to complicated cases than the Lewis representation of atoms. This method allows us to determine the formal charge and oxidation number of each atom in the edifice more efficiently than other methods.展开更多
目的探讨血府逐瘀胶囊联合顺铂对小鼠Lewis肺癌移植瘤血管新生及血管内皮生长因子A(VEGFA)、血管内皮细胞生长因子受体2(VEGFR2)表达的影响。方法从75只C57BL/6小鼠中随机取15只作为正常组,其余小鼠均进行Lewis肺癌荷瘤造模。将造模成功...目的探讨血府逐瘀胶囊联合顺铂对小鼠Lewis肺癌移植瘤血管新生及血管内皮生长因子A(VEGFA)、血管内皮细胞生长因子受体2(VEGFR2)表达的影响。方法从75只C57BL/6小鼠中随机取15只作为正常组,其余小鼠均进行Lewis肺癌荷瘤造模。将造模成功的60只小鼠随机分为模型组、顺铂组、血府逐瘀胶囊组、血府逐瘀胶囊联合顺铂组,每组15只。血府逐瘀胶囊组给予血府逐瘀胶囊0.36 g/kg灌胃,模型组给予生理盐水灌胃,均2次/d;顺铂组给予2 mg/kg的顺铂腹腔注射,2 d 1次;血府逐瘀胶囊联合顺铂组给予0.36 g/kg血府逐瘀胶囊灌胃(2次/d)和2 mg/kg的顺铂腹腔注射(2 d 1次);正常组不给予任何干预。各组连续干预15 d后,统计存活率,摘取瘤组织并称量瘤重,计算抑瘤率,免疫组化法检测肿瘤组织中微血管数量,ELISA法测定血浆VEGFA、碱性成纤维细胞生长因子(bFGF)水平,免疫印迹法检测肿瘤组织中VEGFA、VEGFR2蛋白表达情况。结果顺铂组和血府逐瘀胶囊联合顺铂组小鼠存活率明显高于模型组和血府逐瘀胶囊组(P均<0.05);血府逐瘀胶囊联合顺铂组瘤重明显低于其他组(P均<0.05),抑瘤率明显高于顺铂组和血府逐瘀胶囊组(P均<0.05),肿瘤组织中微血管数明显少于模型组和血府逐瘀胶囊组(P均<0.05);顺铂组瘤重明显低于模型组和血府逐瘀胶囊组(P均<0.05),抑瘤率明显高于血府逐瘀胶囊组(P<0.05),肿瘤组织中微血管数明显少于其他组(P均<0.05)。顺铂组血浆VEGFA、bFGF水平和肿瘤组织中VEGFA、VEGFR2蛋白相对表达量均明显低于模型组(P均<0.05);血府逐瘀胶囊联合顺铂组血浆bFGF水平和肿瘤组织中VEGFR2蛋白相对表达量均明显低于模型组(P均<0.05)。结论血府逐瘀胶囊联合顺铂对Lewis肺癌荷瘤小鼠具有显著的抑瘤及抑制肿瘤血管新生的作用,其机制可能与VEGFA/VEGFR2信号通路相关。展开更多
Since the discovery in 2011,MXenes have become the rising star in the field of two-dimensional materials.Benefiting from the metallic-level conductivity,large and adjustable gallery spacing,low ion diffusion barrier,r...Since the discovery in 2011,MXenes have become the rising star in the field of two-dimensional materials.Benefiting from the metallic-level conductivity,large and adjustable gallery spacing,low ion diffusion barrier,rich surface chemistry,superior mechanical strength,MXenes exhibit great application prospects in energy storage and conversion,sensors,optoelectronics,electromagnetic interference shielding and biomedicine.Nevertheless,two issues seriously deteriorate the further development of MXenes.One is the high experimental risk of common preparation methods such as HF etching,and the other is the difficulty in obtaining MXenes with controllable surface groups.Recently,Lewis acidic etching,as a brand-new preparation strategy for MXenes,has attracted intensive attention due to its high safety and the ability to endow MXenes with uniform terminations.However,a comprehensive review of Lewis acidic etching method has not been reported yet.Herein,we first introduce the Lewis acidic etching from the following four aspects:etching mechanism,terminations regulation,in-situ formed metals and delamination of multi-layered MXenes.Further,the applications of MXenes and MXene-based hybrids obtained by Lewis acidic etching route in energy storage and conversion,sensors and microwave absorption are carefully summarized.Finally,some challenges and opportunities of Lewis acidic etching strategy are also presented.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant Nos.12174275,62174113,61874139,61904201,and 11875088)Guangdong Basic and Applied Basic Research Foundation (Grant No.2019B1515120057)。
文摘Inorganic Cs_(2)SnI_(6) perovskite has exhibited substantial potential for light harvesting due to its exceptional optoelectronic properties and remarkable stability in ambient conditions.The charge transport characteristics within perovskite films are subject to modulation by various factors,including crystalline orientation,morphology,and crystalline quality.Achieving preferred crystalline orientation and film morphology via a solution-based process is challenging for Cs_(2)SnI_(6) films.In this work,we employed thiourea as an additive to optimize crystal orientation,enhance film morphology,promote crystallization,and achieve phase purity.Thiourea lowers the surface energy of the(222)plane along the(111)direction,confirmed by x-ray diffraction,x-ray photoelectron spectroscopy,ultraviolet photoelectron spectroscopy studies,and density functional theory calculations.Varying thiourea concentration enables a bandgap tuning of Cs_(2)SnI_(6) from 1.52 eV to1.07 eV.This approach provides a novel method for utilizing Cs_(2)SnI_(6) films in high-performance optoelectronic devices.
文摘The systematic method for constructing Lewis representations is a method for representing chemical bonds between atoms in a molecule. It uses symbols to represent the valence electrons of the atoms involved in the bond. Using a number of rules in a defined order, it is often better suited to complicated cases than the Lewis representation of atoms. This method allows us to determine the formal charge and oxidation number of each atom in the edifice more efficiently than other methods.
文摘目的探讨血府逐瘀胶囊联合顺铂对小鼠Lewis肺癌移植瘤血管新生及血管内皮生长因子A(VEGFA)、血管内皮细胞生长因子受体2(VEGFR2)表达的影响。方法从75只C57BL/6小鼠中随机取15只作为正常组,其余小鼠均进行Lewis肺癌荷瘤造模。将造模成功的60只小鼠随机分为模型组、顺铂组、血府逐瘀胶囊组、血府逐瘀胶囊联合顺铂组,每组15只。血府逐瘀胶囊组给予血府逐瘀胶囊0.36 g/kg灌胃,模型组给予生理盐水灌胃,均2次/d;顺铂组给予2 mg/kg的顺铂腹腔注射,2 d 1次;血府逐瘀胶囊联合顺铂组给予0.36 g/kg血府逐瘀胶囊灌胃(2次/d)和2 mg/kg的顺铂腹腔注射(2 d 1次);正常组不给予任何干预。各组连续干预15 d后,统计存活率,摘取瘤组织并称量瘤重,计算抑瘤率,免疫组化法检测肿瘤组织中微血管数量,ELISA法测定血浆VEGFA、碱性成纤维细胞生长因子(bFGF)水平,免疫印迹法检测肿瘤组织中VEGFA、VEGFR2蛋白表达情况。结果顺铂组和血府逐瘀胶囊联合顺铂组小鼠存活率明显高于模型组和血府逐瘀胶囊组(P均<0.05);血府逐瘀胶囊联合顺铂组瘤重明显低于其他组(P均<0.05),抑瘤率明显高于顺铂组和血府逐瘀胶囊组(P均<0.05),肿瘤组织中微血管数明显少于模型组和血府逐瘀胶囊组(P均<0.05);顺铂组瘤重明显低于模型组和血府逐瘀胶囊组(P均<0.05),抑瘤率明显高于血府逐瘀胶囊组(P<0.05),肿瘤组织中微血管数明显少于其他组(P均<0.05)。顺铂组血浆VEGFA、bFGF水平和肿瘤组织中VEGFA、VEGFR2蛋白相对表达量均明显低于模型组(P均<0.05);血府逐瘀胶囊联合顺铂组血浆bFGF水平和肿瘤组织中VEGFR2蛋白相对表达量均明显低于模型组(P均<0.05)。结论血府逐瘀胶囊联合顺铂对Lewis肺癌荷瘤小鼠具有显著的抑瘤及抑制肿瘤血管新生的作用,其机制可能与VEGFA/VEGFR2信号通路相关。
基金supported by the Highstar Corporation HSD20210118Taihu Electric Corporation 0001。
文摘Since the discovery in 2011,MXenes have become the rising star in the field of two-dimensional materials.Benefiting from the metallic-level conductivity,large and adjustable gallery spacing,low ion diffusion barrier,rich surface chemistry,superior mechanical strength,MXenes exhibit great application prospects in energy storage and conversion,sensors,optoelectronics,electromagnetic interference shielding and biomedicine.Nevertheless,two issues seriously deteriorate the further development of MXenes.One is the high experimental risk of common preparation methods such as HF etching,and the other is the difficulty in obtaining MXenes with controllable surface groups.Recently,Lewis acidic etching,as a brand-new preparation strategy for MXenes,has attracted intensive attention due to its high safety and the ability to endow MXenes with uniform terminations.However,a comprehensive review of Lewis acidic etching method has not been reported yet.Herein,we first introduce the Lewis acidic etching from the following four aspects:etching mechanism,terminations regulation,in-situ formed metals and delamination of multi-layered MXenes.Further,the applications of MXenes and MXene-based hybrids obtained by Lewis acidic etching route in energy storage and conversion,sensors and microwave absorption are carefully summarized.Finally,some challenges and opportunities of Lewis acidic etching strategy are also presented.
