柔性聚合物辅助的合体CsPbBr3纳米晶体自组装成具有强大的纳米晶体间电子合的更高阶超结构
Yang Yang1, Jacob T Lee1, Thakshila Liyanage1
1Department of Chemistry and Chemical Biology , Indiana University-Purdue University Indianapolis , Indianapolis , Indiana 46202 , United States.
Journal of the American Chemical Society
|January 5, 2019
概括
功能性聚乙烯糖醇配体使化物矿纳米晶体 (NCs) 能够自组装成各种各样的上层结构. 这些有序的NC超结构具有可调节的光电子特性,为先进的固态设备铺平了道路.
科学领域:
- 材料科学
- 纳米技术
- 化学学
背景情况:
- 合纳米晶 (NC) 对先进材料至关重要,但对高阶结构的控制组装仍然具有挑战性.
- 在NC合成中,表面被动化对象至关重要,但它们在CsPbX3NCs的层次上构造中的作用尚未得到充分研究.
研究的目的:
- 证明使用功能性聚乙烯糖醇 (PEG6-Y) 作为合成均CsPbBr3NC的表面连接物.
- 研究这些NC的自我组装到各种超结构中,并探索它们的光电子特性.
主要方法:
- 使用PEG6-Y连接物合成几乎均的CsPbBr3NCs (3.0纳米直径).
- 在现场观测和NC上层结构的合成后操作 (珍珠项链,板状,纳米石).
- 谱分析 (吸收峰值转移) 来探测NC电子合.
主要成果:
- PEG6-Y连接物有助于形成统一的CsPbBr3NC,并将其组装成各种各样的上层结构,如珍珠项链和纳米.
- 合成后的连接剂处理允许不同类型的上层结构进行转换.
- 在组装结构中,显著的色转移 (∼240 meV) 表明强大的NC电子合.
- 在储存过程中观察到自发的扭曲带层结构的形成.
结论:
- 功能性PEG连接物使得CsPbBr3NC的无模板,自组装的上层结构形成,模仿生物系统.
- 新兴的光电子特性和有序的超结构对固态设备应用具有前景.
- 这种方法简化了基于NC的材料的可扩展制造.
更多相关视频
04:14Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
Published on: October 1, 2019
13.6K
06:16Fabrication of Spherical and Worm-shaped Micellar Nanocrystals by Combining Electrospray, Self-assembly, and Solvent-based Structure Control
Published on: February 11, 2018
20.1K
相关概念视频
03:22Colloids
21.0K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
21.0K
02:28Titration Calculations: Strong Acid - Strong Base
33.8K
Calculating pH for Titration Solutions: Strong Acid/Strong Base
A titration is carried out for 25.00 mL of 0.100 M HCl (strong acid) with 0.100 M of a strong base NaOH. The pH at different volumes of added base solution can be calculated as follows:
(a) Titrant volume = 0 mL. The solution pH is due to the acid ionization of HCl. Because this is a strong acid, the ionization is complete and the hydronium ion molarity is 0.100 M. The pH of the solution is then:
A titration is carried out for 25.00 mL of 0.100 M HCl (strong acid) with 0.100 M of a strong base NaOH. The pH at different volumes of added base solution can be calculated as follows:
(a) Titrant volume = 0 mL. The solution pH is due to the acid ionization of HCl. Because this is a strong acid, the ionization is complete and the hydronium ion molarity is 0.100 M. The pH of the solution is then:
33.8K
02:34Polymers
40.8K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
40.8K
03:22Strong Acid and Base Solutions
35.6K
A strong acid is a compound that dissociates completely in an aqueous solution and produces a concentration of hydronium ions equal to the initial concentration of acid. For example, 0.20 M hydrobromic acid will dissociate completely in water and produces 0.20 M of hydronium ions and 0.20 M of bromide ions.
35.6K
01:23Titration of a Strong Acid with a Strong Base
10.5K
During the titration of a strong acid with a strong base, pH calculations are primarily based on the concentration of residual hydronium or hydroxide ions. Initially, a strong acid like hydrochloric acid fully dissociates, creating hydronium and chloride ions, resulting in a low pH. The addition of a strong base like sodium hydroxide alters the concentration of hydronium ions by neutralizing them. As more base is added, the pH gradually increases. At the equivalence point, all hydronium ions...
10.5K
01:17Colloids and Suspensions
3.4K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
3.4K