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Journal of Sol-Gel Science and Technology

, Volume 81, Issue 3, pp 741–749 | Cite as

Towards the hydrothermal growth of hierarchical cauliflower-like TiO2 anatase structures

  • Imperio Anel Perales-MartínezEmail author
  • Vicente Rodríguez-González
Original Paper: Nano-structured materials (particles, fibers, colloids, composites, etc.)

Abstract

TiO2 anatase nanostructure-based hierarchical spheres were synthesized by using a facile microwave-assisted hydrothermal method. H2SO4 was used as both phase inducer for the formation of anatase and capping agent to promote the self-assembly of cauliflower-like spheres. The hydrothermal synthesis was carried out at 180 °C for 2 h from an acid colloidal solution of titanium tetraisopropoxide, at pH < 2. The relationship between morphology and structure was studied by the means of X-ray diffraction, high-resolution transmision electron microscopy, scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, nitrogen adsorption and ultraviolet-visible spectroscopy analyses. The results revealed that the acid concentration is a key factor to the controlled hydrothermal aggregation of TiO2 anatase faceted-like nanoparticles, leading to hierarchical cauliflower-like structures. The microspheres consist of hierarchical structures of sheet-shaped TiO2 anatase particles with exposed {001} and {101} facets. The nanostructures grow in preferential directions to become in sheet-shaped, by an oriented attachment mechanism. The sulphate groups anchored on the surface and detected by X-ray photoelectron spectroscopy, help the hydrothermal formation of hierarchical spheres and then the cauliflower-like morphology.

Graphical Abstract

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Keywords

Hierarchical cauliflower-like structures H2SO4 as capping agent Exposed facets Microwave-assisted hydrothermal method Acid colloidal solution 

Notes

Acknowledgments

The authors would like to express their gratitude to CONACYT for the financial support (CB-2011/169597 and LINAN-0271911). We thank M. C. Beatriz A. Rivera Escoto, Dr. Gladis J. Labrada and Dr. Hector Silva from LINAN-IPICYT for the XRD, FE-SEM and HRTEM characterizations. I. A. Perales Martinez appreciates the CONACYT PhD scholarship.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  • Imperio Anel Perales-Martínez
    • 1
    Email author
  • Vicente Rodríguez-González
    • 2
  1. 1.Instituto Tecnologico y de Estudios Superiores de MonterreyCampus MonterreyC.P. 64849 Monterrey, Nuevo LeónMexico
  2. 2.División de Materiales AvanzadosIPICYT (Instituto Potosino de Investigación Científica y Tecnológica)San Luis PotosíMexico

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