期刊
ACS NANO
卷 10, 期 12, 页码 11179-11186出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.6b06233
关键词
plasmonic circular dichroism; gold nanorod; self-assembly; hydrogels; reversible modulation
类别
资金
- Basic Research Development Program [2013CB834504]
- National Natural Science Foundation of China [91427302, 21227802]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB12020200]
- Chinese Academy of Sciences
The fabrication of chiroptical plasmonic nanomaterials such as chiral plasmonic gold nanorods (GNRs) has been attracting great interest. Generally, in order to realize the plasmonic circular dichroism (PCD) from achiral GNRs, it is necessary to partially replace the surface coated cetyltrimethylammonium bromide with chiral molecules. Here, we present a supramolecular approach to generate and modulate the PCD of GNRs through the hybrid gelation of GNRs with an amphiphilic chiral dendron gelator. Upon gelation, the PCD could be produced and further regulated depending on the ratio of the dendrons to GNRs. It was revealed that the wrapping of the self-assembled nanofibers around the GNRs is crucial for generating the PCD. Furthermore, the hybrid gel underwent a thermotriggered gel sol and sol gel transformation, during which the PCD can disappear (solution) and reappear (gel), respectively, and such process can be repeated many times. In addition, the hybrid gel could also undergo shrinkage upon addition of a slight amount of Mg2+ ions, during which the PCD disappeared also. Thus, through the gel formation and subsequent metal ion- or temperature-triggered phase transition, PCD can be reversibly modulated. The results not only clarified the generation mechanism of PCD from the achiral GNRs without the chiral modification on the surface but also offered a simple and efficient way to modulate the PCD.
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