Effect of Titania Colloid Solution Concentration on Hydrophobicity of Well-Aligned TiO2 Nanorods Synthesized via Hydrothermal Method

Subject Areas : Materials synthesis and charachterization

Farhad karimkhani ¹ , h. ghayour ² , B. Boka ³

1 - Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Isfahan, Iran.
2 - Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Isfahan, Iran.
3 - Department of Materials Engineering, Najafabad Branch, Islamic Azad University, Isfahan, Iran.

Received: 2013-12-11 Accepted : 2014-01-03 Published : 2014-02-01

Keywords: TiO2, nanorod, Hydrothermal method, Hydrophobicity,

Abstract :

Among one dimensional nanomaterials, TiO2 nanorods have found important applications in various industries due to optical, photocatalyst and self-cleaning properties. In this research, at first TiO2 nanorods were synthesized on a glass substrate by hydrothermal method. Then a thin film of TiO2 particles was dip coated (as seed layer) on the substrate. After that, hydrothermal synthesis of TiO2 nanorods with 0.05 and 0.1 mol concentrations was carried out on the seed layer. Morphology and microstructure of the seed layer and nanorods were investigated using scanning electron microscopy (SEM), X-ray diffraction (XRD) and atomic force microscopy (AFM). Hydrophobicity of nanorods was studied by contact angle instrument. Results revealed that nanorods synthesized on the glass substrate without seed layer are not aligned at all and have the average diameter of 120 nm, whereas nanorods synthesized on the seed layer are well-aligned with 30nm average diameter. The result obtained from contact angle instrument showed that nanorods synthesized with 0.05mol concentration have larger contact angle (157º), compared to those synthesized with 0.1mol concentration which have 115º contact angle.

References:

 

1. J. J. Wu, C. C. Yu, “Environmentally Benign Photocatalysts: Applications of Titanium Oxide-Based” J. Phys. Chem. B, Vol. 108, 2004, pp. 3377–3379.


2. Y. Li, M. Guo, M. Zhang, X. Wang, “Hydrothermal Synthesis and Characterization of TiO2 nanorod arrays on Glass Substrates” Mater. Res. Bull., Vol. 44, 2009, pp. 1232–1237.


3. D. V. Bavykin, J. M. Friedrich, F.C. Walsh, “ProtonatedTitanates and TiO2 Nanostructured Materials: Synthesis, Properties, and Applications” Adv. Mater., Vol. 18, 2006, pp. 2807–2824.


4. X. Ma, T. Zhu, H. Xu, G. Li, J. Zheng, A. Liu, J. Zhang, H. Du, “Rapid Response Behavior, at RoomTemperature, of a Nanofiber-Structured TiO2 Sensor to Selected Simulant Chemical-Warfare Agents”, Analytical and Bioanalytical Chemistry, Vol. 390, 2008, pp. 1133–1137.


5. A. Fujishima, K. Honda, “Electrochemical Photolysis of Water at a Semiconductor Electrode”, Nature, Vol. 238, 1972, pp. 37–38.


6. X. T. Zhang, O. Sato, M. Taguchi, Y. Einaga, T.Murakami, A. Fujishima, “Self-Cleaning Particle Coating with Antireflection Properties”, Chem. Mater, Vol. 17, 2005, pp. 696–700.


7. Y. Coffinier, S. Janel, A. Addad, R. Blossey, L. Gengembre, E. Payen, R. Boukher, “Preparation of Superhydrophobic Silicon Oxide Nanowire Surfaces”, Langmuir, Vol. 23, 99. 2007, pp. 1608–1611.


8. W. Ho, J.C. Yu, J.G. Yu, “Photocatalytic TiO2/Glass Nanoflake Array Films”, Langmuir, Vol. 21, 2005, pp. 3486–3492.


9. M. Paulose, K. Shankar, S. Yoriya, H.E. Prakasam, O.K. Varghese, “Anodic Growth of Highly Ordered TiO2 Nanotube Arrays to 134 μm in Length”, J. Phys. Chem. B, Vol. 110, 2006, pp. 16179–16184.


10. S. K. Pradhan, P. J. Reucroft, F. Yang, Dozier, “Growth of TiO2 Nanorods by Metalorganic Chemical Vapor Deposition”, Journal ofCrystalGrowth, Vol. 256, 2003, pp. 83–88.


11. Z. R. Tian, J. A. Voigt, J. Liu, B. Mckenzie, H. Xu, J. Am, “Large Oriented Arrays and Continuous Films of TiO2-Based Nanotubes”, J. Am. Chem. Soc., Vol. 125, 2003, pp 12384–12385.


12. A. B. D. Cassie, S. Baxter, “Wettability of Porous Surfaces”, Trans. Faraday Soc, Vol. 40, 1944, pp. 546-551.