Assembly and manipulation of Fe3O4/coumarin bifunctionalized submicrometer janus particles

Yi Cheng Chao, Wei Hao Huang, Keng Ming Cheng, Changshu Kuo

研究成果: Article同行評審

31 引文 斯高帕斯(Scopus)


Magnetic and fluorescent bifunctionalized Janus particles were fabricated via sequential particle embedding and surface modifications. The two hemispherical surfaces of a 500 nm silica particle were separately functionalized with Fe3O4 nanoparticles and coumarin dye molecules. The Fe3O4 hemisphere exhibited magnetically driven particle orientation and alignment, whereas the coumarin hemisphere served as an anisotropic emission indicator. The photoluminescence of these orientated and solidified Janus particles revealed anisotropic emission contrast as high as 40% between the magnet-aspect and the dye-aspect excitations. The dynamic anisotropic emission of the bifunctionalized Janus suspension under magnetic manipulation also revealed a nonsynchronized bulk correlation time that was much slower than that of an individual 500 nm particle. Under a static magnetic field, the suspended Janus particles assembled into a grape-like bunch, with random particle orientation. Unlike their microscale counterparts, the submicrometer magnetic Janus particles were less sensitive to gravity and more vulnerable to particle-particle interactions.

頁(從 - 到)4338-4345
期刊ACS Applied Materials and Interfaces
出版狀態Published - 2014 3月 26

All Science Journal Classification (ASJC) codes

  • 材料科學(全部)


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