Journal of Inorganic Materials ›› 2018, Vol. 33 ›› Issue (12): 1337-1342.DOI: 10.15541/jim20180180

• RESEARCH PAPER • Previous Articles     Next Articles

Controllable Preparation of Nano-TiO2 Lens by Silicon Oil Two-step Dehydration Method

FAN Wen, WU Li-Min   

  1. Department of Materials Science and State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai 200433, China
  • Received:2018-04-25 Online:2018-12-20 Published:2018-11-27
  • About author:FAN Wen. E-mail: 12110300010@fudan.edu.cn
  • Supported by:
    National Key R&D Program of China (2017YFA0204600);National Natural Science Foundation of China (51721002, 51673045)

Abstract:

Bottom-up assembly of nanoparticles into new materials with sub-wavelength features has become an important means to manipulate and utilize light. Here, we report a novel nano-assembly technology, named silicon oil two-step dehydration method. This method utilizes the rheological and confinement effects of the oil-water interface and enables the assembly of 15 nm titanium dioxide (TiO2) nanoparticles into macroscopic hemispherical optical lenses with high refractive index and high transparency. The TiO2 lens can be large-scale produced with this method. Moreover, the assembly process and mechanism are analyzed in details. In addition, this method can also achieve uniform composites of TiO2 nanoparticles with other nanomaterials, such as gold (Au) nanoparticles, Au nanorods, Au nanocubes or graphene oxide, enabling the preparation of TiO2/Au or TiO2/graphene oxide composite devices. Among them, after the recombination of TiO2 nanoparticles, the surface plasmon absorption peak of Au nanoparticles, Au nanorods or Au nanocubes have a significant red shift, indicating that this assembly method provides an effective way for the preparation of functional composite optoelectronic devices in the future.

 

Key words: titanium dioxide, nanoparticles, self-assembly, nano-optics, composition

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