Sains Malaysiana 43(6)(2014): 947–951

 

Titanium Dioxide Nanotubes in Chloride Based Electrolyte: An Alternative to Fluoride

Based Electrolyte

(Nanotiub Titanium Dioksida dalam Elektrolit Berasaskan Klorida: Suatu Alternatif

kepada Elektrolit Berasaskan Florida)

S.W. NG*, F.K. YAM, K.P. BEH & Z. HASSAN

Nano-Optoelectronics Research and Technology Laboratory, School of Physics, Universiti Sains Malaysia, 11800 Penang, Malaysia

 

Diserahkan: 29 Mac 2013/Diterima: 1 Disember 2013

 

ABSTRACT

Often, fluoride based electrolyte was applied to synthesize highly ordered titanium dioxide nanotubes. However, in the present work, bundled titanium dioxide nanotubes were fabricated in chloride based electrolyte through electrochemical method. Structural and morphological investigations were carried out on the nanotubes synthesized under different anodization parameters. The growth mechanism of such nanotubes was elucidated and illustrated. The estimated diameter of the as-anodized nanotube was less than 150 nm while the length varied from hundreds of nanometer to microns. X-ray diffraction patterns and Raman spectra have showed anatase and rutile phases of titanium dioxide within the thermally treated samples.

 

Keywords: Anodization; chloride based electrolyte; growth mechanism; titanium dioxide nanotubes

 

ABSTRAK

Kebiasaannya, elektrolit berasaskan flourida digunakan untuk menyediakan nanotiub titanium dioksida yang tersusun rapi. Namun begitu, dalam kertas ini, kelompok nanotiub titanium dioksida difabrikasi dalam elektrolit berdasarkan klorida melalui kaedah elektrokimia. Siasatan struktur dan morfologi dilakukan pada nanotiub yang disediakan dengan pelbagai parameter pengoksidaan. Mekanisme pertumbuhan nanotiub tersebut dijelas dan digambarkan. Diameter anggaran nanotiub yang disediakan adalah kurang daripada 150 nm manakala panjangnya berbeza daripada ratusan nanometer ke mikrometer. Corak pembelauan sinar X dan spektrum Raman menunjukkan fasa anatase dan rutil bagi titanium dioksida dalam sampel yang dirawat dengan terma.

 

Kata kunci: Elektrolit berasaskan klorida; mekanisme pertumbuhan; nanotiub titanium dioksida; pengoksidaan

RUJUKAN

Allam, N.K. & Grimes, C.A. 2007. Formation of vertically oriented TiO2 nanotube arrays using a fluoride free HCl aqueous electrolyte. Journal of Physical Chemistry C 111: 13028-13032.

Allam, N.K., Shankar, K. & Grimes, C.A. 2008. Photoelectrochemical and water photoelectrolysis properties of ordered TiO2 nanotubes fabricated by Ti anodization in fluoride-free HCl electrolytes. Journal of Materials Chemistry 18: 2341-2348.

Balachandran, U. & Eror, N.G. 1982. Raman spectra of titanium dioxide. Journal of Solid State Chemistry 42: 276-282.

Chen, X., Schriver, M., Suen, T. & Mao, S.S. 2007. Fabrication of 10 nm diameter TiO2 nanotube arrays by anodization. Thin Solid Films 515: 8511-8514.

Lamberti, A., Sacco, A., Bianco, S., Manfredi, D., Cappelluti, F., Hernandez, S., Quaglio, M. & Pirri, C.F. 2013. Charge transport improvement employing TiO2 nanotube arrays as front-side illuminated dye-sensitized solar cell photoanodes. Physical Chemistry Chemical Physics 15: 2596-2602.

Liu, Z., Pesic, B., Raja, K.S., Rangaraju, R.R. & Misra, M. 2009. Hydrogen generation under sunlight by self-ordered TiO2 nanotube arrays. International Journal of Hydrogen Energy 34: 3250-3257.

Neupane, M.P., Park, I.S., Bae, T.S., Yi, H.K., Watari, F. & Lee, M.H. 2011. Synthesis and morphology of TiO2 nanotubes by anodic oxidation using surfactant based fluorinated electrolyte. Journal of the Electrochemical Society 158: C242-C245.

Richter, C., Panaitescu, E., Willey, R.J. & Menon, L. 2007a. Titania nanotubes prepared by anodization in fluorine-free acids. Journal of Materials Research 22: 1624-1631.

Richter, C., Wu, Z., Panaitescu, E., Willey, R.J. & Menon, L. 2007b. Ultra-high-aspect-ratio titania nanotubes. Advanced Materials 19(7): 946-948.

Sang, L.X., Zhang, Z.Y., Bai, G.M., Du, C.X. & Ma, C.F. 2012. A photoelectrochemical investigation of the hydrogen-evolving doped TiO2 nanotube arrays electrode. International Journal of Hydrogen Energy 37: 854-859.

Shankar, K., Mor, G.K., Prakasam, H.E., Yoriya, S., Paulose, M., Varghese, O.K. & Grimes, C.A. 2007. Highly-ordered TiO2 nanotube arrays up to 220 μm in length: Use in water photoelectrolysis and dye-sensitized solar cells. Nanotechnology 18: 06570.

Yoriya, S. & Grimes, C.A. 2011. Self-assembled anodic TiO2 nanotube arrays: Electrolyte properties and their effect on resulting morphologies. Journal of Materials Chemistry 21: 102-108.

 

*Pengarang untuk surat-menyurat; email: sw.ng@live.com

 

 

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