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
The extraction method based on the reversible chemical complexation is highly effective and selective for separating polar organic solutes from dilute solutions,and the basicity of the extractant is one of the most im...The extraction method based on the reversible chemical complexation is highly effective and selective for separating polar organic solutes from dilute solutions,and the basicity of the extractant is one of the most important parameters affecting the extraction equilibrium.In this paper,the determination of basicity of Lewis basic extractant and its mixture solvent was first proposed on the basis of extraction behavior of HCl and the appropriate stoichiometric ratio of solute to extractant.The basicities of two Lewis basic chemicals,n-octy-lamine and di-n-butylamine,and some basicity of typical Lewis basic extractant mixture,trioctylamine(TOA)/1-octanol and trialkylphosphine oxide(TRPO)/kerosene,were measured at 25 ℃ by using this me-thod.The results show that this method was more accurate and simple,the basicity of Lewis basic chemicals was in agreement with the values reported in the literature,and the basicity of the mixture solvent depended on the extractant type and concentration.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Lewis y单克隆抗体(mAb)对α1,2岩藻糖转移酶基因转染后高表达Lewis y抗原的卵巢癌细胞系RMG-I-H的体外增殖能力、黏附力以及侵袭力的抑制作用。方法:通过体外细胞增殖实验、细胞黏附实验、细胞体外侵袭实验,以羊抗人IgG抗体处理组或无抗体处理组为对照,检测Lewis y mAb处理前后RMG-I-H细胞增殖能力、黏附力及侵袭力的变化。结果:细胞增殖力与黏附力测定结果表明,实验组与对照组之间有统计学意义(P<0.05),且与对照组相比,第2~7天的生长抑制率分别为5.62%、19.75%、34.96%、46.51%、49.78%和33.33%。不同培养时间(15、30、60min)的黏附抑制率分别为47.59%、58.64%和13.85%。体外细胞侵袭实验显示不同浓度Lewisy抗体处理组与对照组比较均无统计学意义(P>0.05)。结论:抗Lewis y mAb能明显抑制体外RMG-I-H细胞的生长及增殖能力、降低体外培养的RMG-I-H细胞的黏附性,Lewis y抗原与卵巢癌细胞增殖、黏附的生物学行为有关,Lewis y抗体在肿瘤的治疗中显示出潜在的应用价值。
文摘The extraction method based on the reversible chemical complexation is highly effective and selective for separating polar organic solutes from dilute solutions,and the basicity of the extractant is one of the most important parameters affecting the extraction equilibrium.In this paper,the determination of basicity of Lewis basic extractant and its mixture solvent was first proposed on the basis of extraction behavior of HCl and the appropriate stoichiometric ratio of solute to extractant.The basicities of two Lewis basic chemicals,n-octy-lamine and di-n-butylamine,and some basicity of typical Lewis basic extractant mixture,trioctylamine(TOA)/1-octanol and trialkylphosphine oxide(TRPO)/kerosene,were measured at 25 ℃ by using this me-thod.The results show that this method was more accurate and simple,the basicity of Lewis basic chemicals was in agreement with the values reported in the literature,and the basicity of the mixture solvent depended on the extractant type and concentration.
