Ionic liquid‐based luminescent composite materials
Ionic liquid‐based luminescent composite materials
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DOI：
10.1002/pat.1202
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发表时间：
2008-10
影响因子：
3.4
通讯作者：
T. Nakashima;Y. Nonoguchi;T. Kawai
中科院分区：
文献类型：
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作者：
T. Nakashima;Y. Nonoguchi;T. Kawai
制备了基于半导体纳米晶（NC）与离子液体以及随后与离子液体基聚合物的发光复合材料。用溴化硫代胆碱（TCB）钝化的阳离子CdTe纳米粒子在水相中制备，并通过简单的两相萃取过程容易地转移到疏水性离子液体中，而不使用任何表面活性剂。TCB封端的CdTe纳米粒子稳定地分散在疏水性离子液体中，即使在萃取后，它们的吸收光谱和光密度（消光系数）也保持不变。虽然发射峰的位置也与原来的相同，但其强度增加了近两倍。基于双（三氟甲磺酰基）酰亚胺（TFSI）和六氟磷酸根（PF 6）阴离子的疏水性离子液体对CdTe纳米粒子具有高效的萃取和光致发光增强作用。然而，微量氢氟酸的产生逐渐使基于PF 6的离子液体中的CdTe NC崩溃。具有丙烯酸酯基团的可聚合离子液体也可以从水中萃取CdTe纳米粒子，并通过离子液体的聚合得到具有强发光的CdTe纳米粒子-聚合物复合物。版权所有© 2008约翰威利父子有限公司。
Luminescent composite materials based on semiconductor nanocrystals (NCs) with ionic liquid and subsequently with an ionic liquid-based polymer have been prepared. Cationic CdTe NCs passivated with thiocholine bromide (TCB) were prepared in an aqueous phase and easily transferred to hydrophobic ionic liquids by means of a simple biphasic extraction process without using any surfactant. TCB-capped CdTe NCs were stably dispersed in hydrophobic ionic liquids and their absorption spectra and optical density (extinction coefficient) were maintained even after the extraction. While the emission peak position was also identical with the original one, its intensity increased almost twice. The efficient extraction and photoluminescence enhancement of CdTe NCs were generally observed for the hydrophobic ionic liquids based on both bis(trifluoromethanesulfonyl)imide (TFSI) and hexafluorophosphate (PF6) anions. However, the generation of a trace of hydrofluoric acid gradually collapsed the CdTe NCs in a PF6-based ionic liquid. A polymerizable ionic liquid which possesses an acrylate group could also extract the CdTe NCs from water and gave a CdTe NC-polymer composite with strong luminescence by the polymerization of ionic liquid. Copyright © 2008 John Wiley & Sons, Ltd.