Ag fractals formed on top of a porous TiO2 thin film

作者：Borges J; Rodrigues M S; Lopes C; Costa D; Ferreira A; Pereira R M S; Costa M F; Vasilevskiy M I; Vaz F

来源：Physica Status Solidi-Rapid Research Letters, 2016, 10(7): 530-534.

DOI：10.1002/pssr.201600131

• silver
• fractals
• TiO2
• surface plasmon resonance
• diffusion-limited aggregation

This wo rk demonstrates the formation of Ag fractals on top of a Ag:TiO2 thin film. The dendrite-type objects emerged from a homogeneous and highly transparent Ag:TiO2 nanocomposite, via the mechanism of diffusion-limited-aggregation of Ag atoms, during heat-treatment at 500 degrees C. A porous TiO2 matrix was also formed during this process, opening a wide range of possible applications, namely in sensing-based ones, together with surface enhanced spectroscopies. Furthermore, fractals incorporate a wide range of shapes and spatial scales, inducing a potentially interesting optical response, over the whole visible range, presumably related with localized surface plasmon modes with very broad spectral distribution.
[GRAPHICS]
Ag fractals on porous TiO2 matrix, emerged from a sputtered Ag: TiO2 nanocomposite thin film, after annealing at 500 degrees C.

• 出版日期2016-7