NDLI: Formation of hierarchical TiO$_{2}$ nanoporous structure from free-standing TiO$

Content Provider	Springer Nature Link
Author	Ali, Ghafar Yoo, Seung Hwa Kum, Jong Min Raza, Hamid Saeed Chen, Deliang Cho, Sung Oh
Copyright Year	2012
Abstract	Hierarchical TiO$_{2}$ nanoporous structures with tailored porosity have been fabricated by simply annealing of free-standing TiO$_{2}$ nanotubes (TNTs) layers in the presence of in situ trapped F-species. The hierarchical nanostructures consist of concatenated anatase TiO$_{2}$ nanoparticles (NPs). TiO$_{2}$ with different hierarchical nanostructure are obtained by changing the annealing rate of the free-standing TNTs layers. The hierarchical structure with nanopores formation in the walls of TNTs is achieved when the annealing rate is 3 °C/min. Increase in the annealing rate of the free-standing TNTs layers leads to the formation of hierarchical nanostructure of anatase TiO$_{2}$ NPs morphologically resembling beads threaded into linear strings. The TiO$_{2}$ hierarchical nanostructure undergoes two evolution steps, which include formation of nanopores in the walls of nanotubes and finally to concatenated anatase TiO$_{2}$ NPs when the annealing rate is increased. Results show that hierarchical nanoporous structure of anatase TiO$_{2}$ consist of nanopores whose diameter varies from 20 to 100 nm. EDX analysis confirms the presence of C and F-species in the as-prepared free-standing TNTs layer in significant amount. It is found that the hierarchical TiO$_{2}$ nanostructure formation mainly depends upon the annealing rate and presence of F-species. GAXRD, Raman analysis and SAED pattern exhibits enhancement in the crystallinity of the hierarchically TiO$_{2}$ nanostructure. This study provides an easy method for the synthesis of the hierarchical anatase TiO$_{2}$ nanostructure on a large scale.
Starting Page	1
Ending Page	11
Page Count	11
File Format	PDF
ISSN	13880764
Journal	Journal of Nanoparticle Research
Volume Number	14
Issue Number	8
e-ISSN	1572896X
Language	English
Publisher	Springer Netherlands
Publisher Date	2012-07-25
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Anodization Titania nanotubes Hierarchical structure TiO$_{2}$ nanoparticles Scanning electron microscope Raman spectroscopy Inorganic Chemistry Characterization and Evaluation of Materials Nanotechnology Physical Chemistry Optics, Optoelectronics, Plasmonics and Optical Devices
Content Type	Text
Resource Type	Article
Subject	Chemistry Nanoscience and Nanotechnology Atomic and Molecular Physics, and Optics Condensed Matter Physics Bioengineering Modeling and Simulation

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