相关实验视频
Updated: Feb 2, 2026

12:56
Seeded Synthesis of CdSe/CdS Rod and Tetrapod Nanocrystals
Published on: December 11, 2013
40.4K
几乎具有理想光学质量的Ag纳米晶体:合成,生长机制和特征
Long Lin1, Min Chen1, Haiyan Qin1
1Center for Chemistry of Novel & High-Performance Materials, Department of Chemistry , Zhejiang University , Hangzhou 310027 , People's Republic of China.
Journal of the American Chemical Society
|November 22, 2018
概括
研究人员开发了一种单晶银纳米晶的单合成方法,优化局部表面等离子体共振 (LSPR) 特性. 与传统的纳米晶体相比, 这种方法提高了拉曼散射的5倍.
科学领域:
- 材料科学
- 纳米技术
- 物理化学
背景情况:
- 银纳米晶体在可见光谱中表现出极好的局部表面等离子体共振 (LSPR) 特性.
- 实现理想的LSPR需要精确控制纳米晶体的大小,形状,结晶度和表面结构,这是一个挑战.
- 现有的方法往往难以同时满足这些严格的要求.
研究的目的:
- 建立一种合成方案,以生产具有理想 LSPR 特性的单晶,单分散球形银纳米晶体.
- 研究一种涉及轻度氧化蚀刻的新增生长机制,以提高纳米晶体质量.
- 展示合成的银纳米晶体的改进LSPR性能和拉曼增强能力.
主要方法:
- 在非极性溶剂中使用单合成.
- 使用微量Cl-离子催化的H+离子进行轻度氧化蚀刻,用于选择性蚀刻和尺寸/晶度聚焦.
- 单晶,单分散的球形银纳米晶体 (7-20 nm) 被合成和特征化.
主要成果:
- 这种合成成功地产生了单晶球形银纳米晶体.
- 半最大的LSPR光谱的全宽度与整个尺寸范围的理论预测相匹配.
- 获得了大约20的LSPR质量因子,而拉曼增强因子是多双晶的5倍.
结论:
- 开发的合成方案有效地控制银纳米晶体结构以实现最佳的LSPR.
- 合成的单晶银纳米晶体表现出卓越的LSPR性能和增强的拉曼散射.
- 这项工作为实现银纳米晶体在等离子应用中的全部潜力提供了途径.
相关概念视频
Ideal Solutions
22.4K
According to Raoult’s law, the partial vapor pressure of a solvent in a solution is equal or identical to the vapor pressure of the pure solvent multiplied by its mole fraction in the solution. However, Raoult's Law is only valid for ideal solutions. For a solution to be ideal, the solvent-solute interaction must be just as strong as a solvent-solvent or solute-solute interaction. This suggests that both the solute and the solvent would use the same amount of energy to escape to the...
22.4K
Radical Chain-Growth Polymerization: Mechanism
3.6K
The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into...
3.6K
Anionic Chain-Growth Polymerization: Mechanism
2.5K
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
2.5K
Cationic Chain-Growth Polymerization: Mechanism
2.9K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.9K
The Ideal Transformer
1.4K
In single-phase two-winding transformers, two windings are coiled around a magnetic core characterized by cross-sectional area A and magnetic permeability μ. A phasor current i1 enters the left winding while i2 exits the right winding, establishing the fundamental working of the transformer through electromagnetic principles.
Ampere's Law forms the basis of understanding the magnetic field within the transformer. It states that the integral of the magnetic field intensity's tangential...
Ampere's Law forms the basis of understanding the magnetic field within the transformer. It states that the integral of the magnetic field intensity's tangential...
1.4K
The Ideal Diode
2.2K
A diode is a semiconductor device that allows current to flow in one direction only, making it a crucial component in electronic circuits for controlling the direction of current flow. An ideal diode is a simplified version of a real diode used to understand how diodes work in circuits. It possesses two terminals: the positive anode and the cathode, which is negative. When a positive voltage is applied to the anode relative to the cathode, the diode is in a forward-biased state, allowing...
2.2K

