作者：Xin Yu, Jinlan Li, Yanxiong Pan, Xiangling Ji, Wei Jiang
关键字：光响应, 嵌段共聚物, 金纳米粒子, 杂化囊泡, 形貌转变, 紫外光
论文来源：期刊
具体来源：Small, 2025, 21(32), 2501719
发表时间：2025年

摘要：响应光刺激的形貌可变无机/有机杂化粒子因在传感器和催化中的潜在应用而受到广泛关注。然而，光诱导杂化嵌段共聚物/无机纳米粒子（BCP/NPs）粒子的精确形貌转变仍是重大挑战。本文将PS接枝金纳米粒子（AuNPs@PS）引入聚苯乙烯-o-硝基苄基酯-聚环氧乙烷（PS-o-NBE-PEO）支架，制备了光响应杂化BCP/NPs囊泡。紫外光照射下，掺入较小AuNPs的杂化PS-o-NBE-PEO/NPs囊泡因PS-o-NBE-PEO支架中o-NBE键光解而转变为杂化多孔球形粒子。此外，由于BCP/AuNPs共组装体系构象熵损失的差异，AuNPs的最终分布以及BCP/NPs组装体的相应形变程度取决于NPs尺寸。通过在BCP模板中原位还原金属前驱体，还可制备杂化BCP/AuNPs和BCP/PtNPs组装体。因此，通过紫外刺激生成了具有不同内部结构的光响应杂化BCP/NPs粒子，实现了杂化BCP/NPs粒子形貌的可调转变，为制造智能材料开辟了独特而有前景的途径。

Abstract：Shape-changeable inorganic/organic hybrid particles in response to light stimuli have received great interest due to their potential applications in sensors and catalysis. However, the light-induced precise shape transition of hybrid block copolymer/inorganic nanoparticles (BCP/NPs) particles remains a considerable challenge. Herein, the light-responsive hybrid BCP/NPs vesicles are fabricated by introducing PS tethered gold nanoparticles (AuNPs@PS) into polystyrene-o-nitrobenzylester-polyethylene oxide (PS-o-NBE-PEO) scaffolds. Upon UV irradiation, the hybrid PS-o-NBE-PEO/NPs vesicles incorporated with smaller AuNPs can transform into hybrid porous spherical particles due to the photocleavage of the o-NBE bond in PS-o-NBE-PEO scaffolds. Besides, attributed to the difference in conformational entropy loss of the BCP/AuNPs co-assembly system, the eventual distribution of AuNPs and the correspondingly shape-converted degree of BCP/NPs assemblies depends on the size of NPs. Furthermore, hybrid BCP/AuNPs and BCP/PtNPs assemblies can be prepared by the in situ reduction of metal precursors in BCP templates. Thus, light-responsive hybrid BCP/NPs particles with various internal structures are generated and the adjustable shape transformation of hybrid BCP/NPs particles is realized by UV stimulus, opening a unique and promising route to fabricate smart materials.

论文链接：https://doi.org/10.1002/smll.202501719