Tarnowicz-Staniak Nina, Staniak Mateusz, Dudek Marta, Grzelczak Marek, Matczyszyn Katarzyna
Institute of Advanced Materials, Faculty of Chemistry, Wrocław University of Science and Technology, Wyb. Wyspiańskiego 27, Wrocław, 50-370, Poland.
Institute of Mathematics, University of Wrocław, pl. Grunwaldzki 2/4, Wrocław, 50-384, Poland.
Small. 2024 Nov;20(47):e2404755. doi: 10.1002/smll.202404755. Epub 2024 Sep 3.
Proper formulation of systems containing plasmonic and photochromic units, such as gold nanoparticles and azobenzene derivatives, yields materials and interfaces with synergic functionalities. Moreover, gold nanoparticles are known to accelerate the Z-E isomerization of azobenzene molecules in the dark. However, very little is known about the light-driven, plasmon-assisted Z-E isomerization of azobenzene compounds. Additionally, most of the azobenzene-gold hybrids are prepared with nanoparticles of small, isotropic shapes and azobenzene ligands covalently linked to the surface of nanostructures. Herein, a formulation of an innovative system combining azobenzene derivative, gold nanorods, and cellulose nanofibers is proposed. The system's structural integrity relies on electrostatic interactions among components instead of covalent linkage. Cellulose, a robust scaffold, maintains the material's functionality in water and enables monitoring of the material's plasmonic-photochromic properties upon irradiation and at elevated temperatures without gold nanorods aggregation. Experimental evidence supported by statistical analysis suggests that the optical properties of plasmonic nanometal enable indirect control over the Z-E isomerization of the photochromic component with near-infrared irradiation by triggering the thermoplasmonic effect. The proposed hybrid material's dual plasmonic-photochromic functionality, versatility, and ease of processing render a convenient starting point for further advanced azobenzene-related research and 3D printing of macroscopic light-responsive structures.
包含等离子体和光致变色单元（如金纳米颗粒和偶氮苯衍生物）的系统的恰当配方，可产生具有协同功能的材料和界面。此外，已知金纳米颗粒在黑暗中会加速偶氮苯分子的Z - E异构化。然而，关于光驱动、等离子体辅助的偶氮苯化合物的Z - E异构化却知之甚少。另外，大多数偶氮苯 - 金杂化物是用小的各向同性形状的纳米颗粒以及与纳米结构表面共价连接的偶氮苯配体制备的。在此，提出了一种结合偶氮苯衍生物、金纳米棒和纤维素纳米纤维的创新系统的配方。该系统的结构完整性依赖于各组分之间的静电相互作用而非共价连接。纤维素作为一种坚固的支架，在水中维持材料的功能，并能够在照射和高温下监测材料的等离子体 - 光致变色性质而不会使金纳米棒聚集。统计分析支持的实验证据表明，等离子体纳米金属的光学性质通过触发热等离子体效应，能够利用近红外辐射间接控制光致变色组分的Z - E异构化。所提出的杂化材料的双等离子体 - 光致变色功能、多功能性和易于加工性，为进一步的高级偶氮苯相关研究及宏观光响应结构的3D打印提供了一个便利的起点。
