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Issue 32, 2014
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Low-temperature conversion of titanate nanotubes into nitrogen-doped TiO2 nanoparticles

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Abstract

Hydrothermally synthesized protonated titanate nanotubes were doped with nitrogen using ammonia gas as the dopant. Thermal decomposition of urea, which served as the ammonia source, offered a low-temperature synthesis route for obtaining a potential visible-light photocatalyst. Nitrogen doping could be achieved at as low as 200 °C. The doped samples were calcined at different temperatures and changes in the morphology and crystalline phase were studied by transmission and scanning electron microscopy, selected area electron diffraction, energy-dispersive X-ray spectroscopy and X-ray diffraction. The nitrogen content and calcination temperature were found to affect the size and shape of the particles as well as their crystalline phase to a great extent. H-form trititanate was shown to transform into rutile TiO2 through the anatase phase in parallel with the collapse of the nanotube morphology and the production of rod-like nanoparticles first and then finally round nitrogen-doped nanoparticles. A phase map was constructed from the data to facilitate the rational design of N-doped trititanate nanotube-based nanostructures.

Graphical abstract: Low-temperature conversion of titanate nanotubes into nitrogen-doped TiO2 nanoparticles

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Article information


Submitted
16 Apr 2014
Accepted
07 Jun 2014
First published
12 Jun 2014

CrystEngComm, 2014,16, 7486-7492
Article type
Paper
Author version available

Low-temperature conversion of titanate nanotubes into nitrogen-doped TiO2 nanoparticles

B. Buchholcz, H. Haspel, Á. Kukovecz and Z. Kónya, CrystEngComm, 2014, 16, 7486
DOI: 10.1039/C4CE00801D

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