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

doi:10.15541/jim20180180

Abstract

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 TiO₂lens 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

CLC Number:

TQ12

FAN Wen, WU Li-Min. Controllable Preparation of Nano-TiO₂ Lens by Silicon Oil Two-step Dehydration Method[J]. Journal of Inorganic Materials, 2018, 33(12): 1337-1342.

Figures/Tables 6

Fig. 1 Schematic diagrams of the assembly of 15 nm TiO2 nanoparticles into a hemispherical lens by silicone oil two-step dehydration method (a, c, e) and corresponding photographs (b, d, f), optical microscopy image focused on the surface of a filter cloth(g), and optical microscopy image focused on the magnified image produced by a TiO2 lens (h)

Fig. 2 SEM image of the stacking morphology of nanoparticles in TiO2 lens

Fig. 3 Photograph of an aqueous dispersion of 5 nm Au nanoparticles (a), mixed droplets of 5 nm Au nanoparticles and 15 nm TiO2 nanoparticles suspended in silicone oil (b), and assembled TiO2/Au composite lenses (c)

Fig. 4 Absorption spectra of an aqueous dispersion of 5 nm Au nanoparticles, a pure TiO2 lens and a TiO2/Au composite lens with inset showing the single absorption spectrum of an aqueous dispersion of 5 nm Au nanoparticles

Fig. 5 Absorption spectra of (a) an aqueous dispersion of Au nanorods with an aspect ratio of 3.6, (b) a TiO2/Au nanorods composite lens, (c) an aqueous dispersion of Au nanocubes with a side length of 30 nm, and (d) a TiO2/Au nanocubes composite lensInsets in (b, d) displaying photographs of the corresponding composite lenses, respectively

Fig. 6 Photographs of (a) a TiO2/graphene oxide composite device and (b) the cross-section of the composite device

References 25

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

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