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相关概念视频

Ionic Crystal Structures02:42

Ionic Crystal Structures

14.5K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.5K
Qualitative Analysis03:46

Qualitative Analysis

22.4K
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
22.4K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

41.8K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
41.8K
Precipitation of Ions03:11

Precipitation of Ions

28.0K
Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
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Electron Configuration of Multielectron Atoms03:26

Electron Configuration of Multielectron Atoms

44.2K
The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
44.2K
Chemical Ionization (CI) Mass Spectrometry01:21

Chemical Ionization (CI) Mass Spectrometry

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The molecular ion peak of a molecule in the mass spectrum provides vital information for molecular identification. However, conventional electron impact ionization can lead to the rapid dissociation of some molecular ions before they reach the detector. A milder ionization method is required to increase the lifetime of such ionized analyte molecules. Chemical ionization (CI) is a gas-phase protonation reaction useful for mass-analyzing analyte molecules that are easily protonated to yield the...
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Low Pressure Vapor-assisted Solution Process for Tunable Band Gap Pinhole-free Methylammonium Lead Halide Perovskite Films
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甲基化 (Cs) 是一种酸.

Yangning Zhang1, Omar F Aly1, Anastacia De Gorostiza1

  • 1McKetta Department of Chemical Engineering and Texas Materials Institute, The University of Texas at Austin, Austin, TX 78712-1062, USA.

Angewandte Chemie (International ed. in English)
|June 5, 2023
PubMed
概括

化和甲基离子合金在酸矿石纳米晶体中稳定了它们的光活性相. 这种离子合金策略提高了用于光电子应用的化基矿的稳定性.

关键词:
阳离子交换所 阳离子交换所混合阴离子矿石 混合阴离子矿石 混合阴离子矿石佩洛夫斯基特纳米晶体的使用热稳定性 热稳定性

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科学领域:

  • 材料科学 材料科学 材料科学
  • 纳米技术纳米技术
  • 固态化学 固态化学

背景情况:

  • 酸 (CsPbI3) 和甲基酸 (MAPbI3) 是具有有前途的光电子性能的矿材料.
  • 然而,它们的相位不稳定性,特别是CsPbI3,限制了它们的实际应用.
  • 作为一种改善矿稳定性的方法,正在探索A-site阴离合金.

研究的目的:

  • 为了合成甲基氧化 (Csx MA1-x PbI3) 纳米晶体,具有不同的A位点组成.
  • 研究这些合金纳米晶体的相稳定性和降解动力学.
  • 评估A位点离子合金在稳定化基矿的有效性.

主要方法:

  • 在CsPbI3和MAPbI3纳米晶体之间进行合成后的室温阴离子交换.
  • 合金Csx MA1-x PbI3纳米晶体的特性,包括组合和光发光 (PL) 调整.
  • 使用Avrami表达式测量和建模相变和降解动力学.

主要成果:

  • 成功获得了Csx MA1-x PbI3纳米晶体,其Cs含量高达x = 0.74,保留了光活性矿阶段.
  • 在合金纳米晶体中证明了可调整组合的光发光 (PL).
  • 与原始纳米晶相比,对合金薄膜的相位转换和降解动力学观察到明显较慢.

结论:

  • 和甲基的A位点离子合金是稳定化纳米晶体中光活性矿阶段的有效策略.
  • 合金的Csx MA1-x PbI3纳米晶体表现出增强的相稳定性,由较慢的转变动力学表明.
  • 这种方法有望为各种应用开发更稳定的化基矿材料.