Luminescence Properties of Ti3+ Doped Methyltriethoxysilane Modified SiO2 Composite Coating

Abstract

Abstract: Titanium trichloride doped silica coating modified by methyltriethoxysilane(MTES) was prepared by sol-gel method using two steps hydrolytic condensation with tetraethoxysilane(TEOS) and MTES as the precursors and hydrochloric acid as the catalyst. The properties of the coating were characterized with IR spectroscopy, X-ray diffractometer, spectroscopic ellipsometry and luminescence spectroscopy. The result showed that Ti³⁺ doped SiO₂ coatings gave an excitation spectrum with two maxima, one at the wavelength of 250 nm, the other at the wavelength of 294 nm. Strong emission of Ti³⁺ doped SiO₂ coatings was observed with a maximum at 393 nm. The Si—OH peak of MTES modified SiO₂ composite coating is appreciably weaker and the Si—O—Si absoption peak is stronger than the normal Ti³⁺/SiO₂ coating, which indicates that the silicon-oxygen network is improved by addition of MTES. Calculation results show that the porous ratio of the MTES modified Ti³⁺/SiO₂ composite coating was reduced from 13.64% to 6.66%, indicating that the composite coating is much more compact. When the samples were aged in air at 25 ℃ for 30 d, the fluorescence disappeared completely for normal Ti³⁺/SiO₂ coating, while the fluorescence intensity of the MTES modified Ti³⁺/SiO₂ composite coating was only reduced by 18%. When aged in N₂ atmosphere at 25 ℃ for 30 d, the fluorescence intensities of both coatings were reduced by only 10%, Showing that the primary reason of fluorescence quenching is oxidization of Ti³⁺. Addition of MTES in the sol can effectively improve the surface structure of SiO₂ coating, which prevents Ti³⁺ from oxidization leading to a coating with stable fluorescence properties.

Key words: Titanium trichloride, Methyltriethoxysilane, Silica coating, Sol-gel, Luminescence property

CLC Number:

O613

TrendMD:

LAN Fang¹, CAO Cong-Rui¹, XIAO Bo¹, JIANG Xiao-Dong², YUAN Xiao-Dong², JIANG Bo^1*. Luminescence Properties of Ti³⁺ Doped Methyltriethoxysilane Modified SiO₂ Composite Coating[J]. Chem. J. Chinese Universities, doi: .

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Luminescence Properties of Ti³⁺ Doped Methyltriethoxysilane Modified SiO₂ Composite Coating

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