发光的合体量子点的表面被动化与聚二甲基酸 (poly ((dimethylaminoethyl methacrylate)) 通过连接物交换过程
Xiao-Song Wang1, Tieneke E Dykstra, Mayrose R Salvador
1Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, M5S 3H6 Ontario Canada.
Journal of the American Chemical Society
|June 24, 2004
概括
聚甲基甲酸 (PDMAEMA) 功能化化/硫化量子点,最初在中,已成功转移到甲醇中. 这种表面修改保留了它们的光发光,使新的应用成为可能.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术 纳米技术
- 量子点合成 量子点合成
背景情况:
- 化/硫化 (CdSe/ZnS) 等体量子点 (QD) 在光电子学中至关重要.
- 表面连接体交换对于调整QD溶解度和性质至关重要.
- 三聚酸氧化物 (TOPO) 是CdSe/ZnS QDs的常见联体,但限制了在极性溶剂中的可溶性.
研究的目的:
- 探索使用聚甲基甲酸 (PDMAEMA) 作为多联体,用于CdSe/ZnS核心外QDs的表面修饰.
- 为了实现CdSe/ZnS QDs在甲醇中的溶解性,同时保持它们的光发光.
- 为了研究从TOPO到PDMAEMA的配体交换过程.
主要方法:
- 在烯中使用PDMAEMA对CdSe/ZnS核心外QD进行表面修改.
- 通过监测TOPO释放来表征连接物交换.
- 在甲醇和中溶解性测试.
- 光发光光谱学用于评估财产的保存情况.
主要成果:
- PDMAEMA成功地吸附在CdSe/ZnS QD表面上,取代了TOPO.
- 修改后的QDs在甲醇中具有可溶性,没有聚合.
- 在烯和甲醇溶液中都保持了QD的光发光特性.
结论:
- PDMAEMA是一种有效的多联体,用于CdSe/ZnS QDs的表面修饰.
- 这种连接物交换使得溶剂从多转换为甲醇,扩大了QD的适用性.
- QDs的光发光稳定性在修改后得到证实.
相关概念视频
Anionic Chain-Growth Polymerization: Overview
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
Anionic Chain-Growth Polymerization: Mechanism
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 acceptor.
Cationic Chain-Growth Polymerization: Mechanism
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 generated carbocation,...
Step-Growth Polymerization: Overview
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
Many natural and synthetic polymers are produced by...


