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首页> 外文期刊>RSC Advances >Synthesis, micellar structures and emission mechanisms of an AIE and DDED-featured fluorescent pH- and thermo-meter
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Synthesis, micellar structures and emission mechanisms of an AIE and DDED-featured fluorescent pH- and thermo-meter

机译：AIE和DDDed荧光pH和热仪的合成，胶束结构和排放机制

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摘要

A new nanoprobe, the luminescent diblock copolymer PNIPAM(MAh-4)- b -P4VP ( PN4P ), with pH- and thermo-responsive deprotonation-driven emission decay (DDED) and aggregation-induced emission (AIE) features was designed and synthesized. The nanoprobe PN4P can form micellar structures in water with reversible dual-responsive fluorescence (FL) behavior within a wide pH range of 2–11. The critical solution temperature was found at about 32, 30 and 27 °C as the pH switched from 2, 7 to 11. The critical pH value of the probe was about 4.0, and the micelles showed a core–shell inversion in response to pH and thermal stimuli, accompanied by a desirable emission tunability. P4VP as the micellar shell at pH = 2 was more easily dehydrated with the increase in temperature as compared to PNIPAM as the micellar shell at pH > 4. The strongest dehydration of the P4VP shell would make PN4P the most strongly aggregated and the most AIE-active, which supports the 2.10-fold most distinguished thermal-responsive emission enhancement at pH = 2. Moreover, a dramatic acidochromic redshift of the emission band from 450 (pH > 4) to 490 nm (pH = 2) was observed, and the maximum emission at pH = 2 was enhanced by about 2.07-fold as compared with that at pH = 7. Therefore, the probe displays the desired dual responses and good reversibility. AIE and DDED are the two major mechanisms responsible for the dual-responsive emission change, with AIE playing a more important role than DDED. This work offers a promising approach to interpreting temperature (range from 28 to 40 °C) and pH changes (range from 2 to 7) in water.
机译：设计并合成了一种新的NaNopine inaOploce，发光二嵌段共聚物丙哌啶（MAH-4） - B-PN4V（MAH-4） - B-PN4V（PN4P），和热响应式去质子化驱动排放（DDed）和聚集诱导的发射（AIE）特征。 Nanoprobe PN4P可以在水中形成胶束结构，其可逆的双响应荧光（FL）行为在2-11的宽pH范围内。临界溶液温度在约32,30和27℃下发现，作为从2,7-11切换的pH。探针的临界pH值为约4.0，胶束显示响应pH值的核壳反转和热刺激，伴随着所需的排放可调性。作为pH = 2的胶束壳的P4V，与PNIPAM相比，与pNIPAM相比，在pH> 4中的胶束壳相比，温度的增加更容易脱水.P4VP壳的最强脱水将使PN4P成为最强烈的聚合和最阳光活性，其在pH = 2处支持2.10倍最大的热响应发射增强增强。此外，观察到从450（pH> 4）到490nm（pH = 2）的发射带的显着酸性纤维射频，和与pH = 7的相比，pH = 2的最大发射增强约2.07倍。因此，探针显示所需的双响应和良好的可逆性。 AIE和DDed是负责双响应排放变化的两种主要机制，AIE比DDED发挥更重要的作用。这项工作提供了有希望的方法来解释温度（范围为28至40°C），水在水中的pH变化（范围为2至7）。

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