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Facile synthesis of ultrafine TiO2 nanowires with large aspect ratio and its photoactivity

  • G. S. Anjusree , A. M. Asha , K. R. V. Subramanian , N. Sivakumar , A. Sreekumaran Nair , Shantikumar V. Nair and Avinash Balakrishnan
Published/Copyright: August 16, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 104 Issue 6

Abstract

In the present study, ultrafine TiO2 nanowires (∼80 nm in diameter) exhibiting large aspect ratio in the order of 103 were synthesized hydrothermally. Phase and morphological analysis of the nanowires was carried out using X-ray diffractometry, X-ray photoelectron spectroscopy and scanning electron microscopy. High resolution transmission electron microscopy revealed the wire exhibiting growth in (101). A Tauc plot derived from UV analysis showed the average band gap values for nanowires to be less than for nanoparticles of similar diameter. It was observed that nanowires exhibited a high degree of photoactivity in an eosin-based dye system which was found to be 20 – 30 % more than that of nanoparticles. This high photoactivity in nanowires was attributed to the longer charge retention which was observed during lifetime measurements, resulting in easy radical formation and dye degradation. Lifetime measurements on the nanowires showed the recombination time to be 54 ns as compared to 43 ns for nanoparticles.

Keywords: Hydrothermal method; TiO2 nanowires; Tauc plot; Lifetime measurements; Photocatalytic activity
* Correspondence address, Dr. Avinash Balakrishnan, Nanosolar Division, Amrita Centre for Nanosciences and Molecular Medicine, Ponekkara, Kochi, India, Tel.: +91-484-2802020, Fax: +91-484-2802020, E-mail: ,

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Received: 2012-4-18
Accepted: 2012-9-17
Published Online: 2013-08-16
Published in Print: 2013-06-13

© 2013, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.110898
Keywords for this article
Hydrothermal method; TiO2 nanowires; Tauc plot; Lifetime measurements; Photocatalytic activity

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Analysis of V(C, N) nanoparticles in a medium carbon bainitic microalloyed steel and their influence on strengthening
  5. Experimental and numerical investigation of the microstructural influence on the deformation behavior of notched cp-titanium specimens
  6. Interfacial study of Si–Ge multilayers grown using ultrahigh-vacuum chemical vapor deposition
  7. Age-hardenability related to precipitation and lamellar-forming grain boundary reaction in dental low-carat gold alloy
  8. Calorimetric study and phase diagram investigation of the Au–Ga system
  9. Roles of iron and copper salts for controlling morphology of silver nanostructures
  10. Hydrothermal synthesis of nanowires, nanobelts, and nanotubes of vanadium oxides from one reaction system
  11. Facile synthesis of ultrafine TiO2 nanowires with large aspect ratio and its photoactivity
  12. Kinetics of thermal dehydration of sol-gel derived MgO–ZrO2 composite hydrogel
  13. Synthesis and reaction process of β-Si3N4 by means of carbothermal nitridation of serpentine
  14. Analysis of size effect and anisotropy of 6H – SiC thermal conductivity
  15. Effects of molecular polarity on nanofluidic behavior in a silicalite
  16. Vertical static compression performance of honeycomb paperboard
  17. Short Communications
  18. Synthesis of phase purity V2AlC via self-propagation high temperature sintering
  19. Densification and microwave properties of low-temperature co-fired CaO–B2O3–SiO2 glass-ceramic with La–B–Si additions
  20. DGM News
  21. DGM News
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