The synthesis and applications of Cr-doped GLYMO and GLYMO/DAMO surface coating systems for absorbing UV-light by sol-gel process

A new glass coating system, containing $\gamma$-glycidoxypropyltrimethoxysilane/$Cr^{3+}$ (system I:GLYMO/ $Cr^{3+}$) and $\gamma$-glydoxypropyltrimethoxysilane/N-aminoethyl-3-aminopropyltrimethoxysilane /$Cr^{3+}$ (system II:GLYMO/DAMO/$Cr^{3+}$), was synthesized by the sol-gel technique for UV light absorption applications. UV-visible spectroscopy (UV-VIS) was utilized to investigate the optical properties of coating materials. Especially system II showed very low transmission in the UV wavelength regions (300-400 nm) after thermal treatment of the coated surface. The UV transmission property of surfaces did not change at 80, 100, 450 or 500 °C, but a T value as low as 0.07% was obtained between 150 and 450 °C.