Rouholah Ashiri
Dezful Branch, Islamic
Azad University
Barium titanate thin films are widely used for making the multilayer capacitors. High transmittance barium titanate thin films are rarely reported in the literature. This work reports a new sol-gel routine for obtaining high transmittance BaTiO3 (BTO) thin films, then the optical responses of the products are evaluated. Experimental results show that the topography and morphology of BTO coating are improved using our established method and thus the better optical responses have BTO obtained. It is seen that the optical losses of BTO thin coating are lower in contrast to similar works. Results also indicate that increment of the calcination temperature reduces the thin films transparency and thickness. Other results show that an increase in the withdrawal rate of the substrate from the sol results in an increase in the BTO coating thickness and a decrease in transparency of the BTO coating. The prepared highly transparent nanothin films are amorphous due to the maximum temperature experienced and are as thin as 30 nm. We think that obtained BTO thin coatings are desired for optical and electro-optical applications.
[1] XING, X., Phase evolution of barium titanate from alkoxide gel-derived precursor. Journal of Alloys and Compounds, 2004, nr. 384, page 312.
[2] LEE, B., ZHANG, J. Preparation, structure evolution and dielectric properties of BaTiO3 thin films and powders by an aqueous sol-gel process. Thin Solid Films, 2001, nr. 388, page 107.
[3] ZENG, J., Low temperature preparation of barium titanate thin films by a novel sol-gel-hydrothermal method, Materials Letters, 1999, nr. 38, page 112.
[4] THOMAS, R., DUBE, R., Optical and electrical properties of BaTiO3 thin films prepared by chemical solution deposition, Thin Solid Films, 1999, nr. 346, page 212.
[5] J. Wang, T. Zhang, J. Xiang, B. Zhang, Mater. Chem. & Phys. 108 (2008)445-448.
[6] J. F. Ihlefeld, W. J. Borland, J.-P. Maria, Scri. Mater. 58 (2008) 549-552.
[7] Y. Kobayashi, T. Tanase, T. Tabata, T. Miwa, M. Konno, J. Euro. Cera. Soci. 28 (2008)117-122.
[8] S. Song, J. Zhai, X. Yao, Mater. Scie. & Engi. B 145 (2007) 28-33.
[9] C. T. Wu, F. H. Lu, Thin Solid Films 398 –399 (2001) 621-625.
[10] IANCULESCU, A. Structure-properties correlations for barium titanate thin films oBTO ained by rf-sputtering, Journal of the European Ceramic Society, 2007, nr. 27, page 1129.
[11] HUANG, H., YAO, X. Preparation of BaTiO3 thin films by mist plasma evaporation on MgO buffer layer, Ceramic International, 2004, nr. 30, page 1535.
[12] C.K. Tan, G.K.L. Goh, G.K. Lau, Thin Solid Films 516 (2008) 5545-5550.
[13] C. K. Tan, G.K.L. Goh, Thin Solid Films 515 (2007) 6572-6576.
[14] Y. Huang, J. Lin, H. Du, L. Gao, Y. Hu, Mater. Lett. 60 (2006) 3818-3821.
[15] SILVAN, M., BaTiO3 thin films oBTO ained by sol-gel spin coating, Surface and Coatings Technology, 2002, nr. 151, page 118.
[16] YUK, J., Sol-gel BaTiO3 thin film for humidity sensors, Sensors and Actuators B, 2003, nr. 94, page 290.
[17] KUMAZAVA, H., Fabrication of barium titanate thin films with a high dielectric constant by a sol-gel technique, Thin Solid Films, 1999, nr. 353, page 144.
[18] SHARMA, H., Electrical properties of sol-gel processed barium titanate films, Thin Solid Films, 1998, nr. 330, page 178.
[19] ZHANG, H.X., Optical and electrical properties of sol-gel derived BaTiO3 films on ITO coated glass, Materials Chemistry and Physics, 2000, nr. 63, page 174.
[20] P. YU, Preparation and characterization of BaTiO3 powders and ceramics by sol-gel process using oleic acid as surfactant, Materials Science and Engineering A, 2007, nr. 473, page 34.
[21] HENCH, l., WEST, J. K. The Sol-Gel process, Chemical review, 1990, nr. 90, page 33.
[22] BRINKER, C. J, Fundamental of sol-gel dip coating, Thin Solid Films, 1991, nr. 201, page 97.
[23] HARIZANOV, O. A., Formation and crystalization of acac derived sol-gel BaTiO3, Materials Letters, 1998, nr. 34, page 345.
[24] Cui, B.P. Yu, Mater. Sci. Eng. B133 (2006) 205-208.
[25] LUAN, W., Influence of pH value on properties of nanocrystalline BaTiO3 powder, Ceramics International, 2001, nr. 27, page 645.
[26] HARIZANOV, O. A., Sol-gel BaTiO3 from a peptized solution, Materials Letters, 1998, nr. 34, page 232.
[27] KIM, Y., Structure and electron charge-density analysis of nano-sized BaTiO3 powder prepared by solvothermal method,Current Applied Physics,2006, nr. 61, page 266.
[28] HWANG, U., Behavior of barium acetate and titanium isopropoxide during the formation of crystalline barium titanate”, American Chemical Society, 2004, nr. 43, page 728.
[29] HARIZANOV, O., Formation and characterization of sol–gel barium titanate, Materials Science and Engineering B, 2004, nr. 106, page 191.
[30] IANCULESCU, A. Optical characterization and microstructure of BaTiO3 thin films oBTO ained by RF-magnetron sputtering, Applied Surface Science, 2006, nr. 253, page 344.
[31] SASANI GHAMSARI, M., High transparent sol–gel derived nanostructured TiO2 thin film, Materials Letters, 2008, nr. 62, page 361.
[32] BURGOS, M.The sol-gel transformation of TIPT coatings: a FTIR study, Thin Solid Films, 1999, nr. 349, page 19.
[33] W.D. CALLISTER, Fundamentals of Materials Sience and Engineering, 2. ed., John Wiley & Sons, 2004.
[34] XU, Zh., Optical properties of amorphous Ba0.7Sr0.3TiO3 thin films oBTO ained by metal organic decomposition technique, Thin Solid Films, 2006, nr. 515, page 2326.
