In this article, oxygen and temperature-sensing hybrid materials consisting of [Ru(Phen)3]2+ portions covalently-grafted onto the sol–gel derived ormosil network were prepared by co-condensation of tetraethoxysilane (TEOS) using n-octyltriethoxysilane
as the network modifier. For comparison purposes, the hybrid materials in which [Ru(Phen)3]2+ were conventionally physically-incorporated into the matrix were also prepared. The obtained hybrid materials were characterized by Fourier transform infrared (FT-IR), luminescence
intensity oxygen quenching Stern-Volmer plots, temperature quenching plots and excited-state lifetime. The near linear Stern-Volmer plots can be attributed to the approximate heterogeneous environment of the luminophore within the ormosil materials. The results reveal that the covalently-grafted
sample is more sensitive to O2, and has a higher sensing sensitivity and a higher thermal activation energy compared to the physically-incorporated one, since these Ru(II) molecules are strongly covalently-grafted onto the Si–O network via the CH2–Si bonds
and less –OH group.
在这篇文章中,通过使用n-辛基三乙氧基硅烷作为网络改性剂,将[Ru(Phen)3]2+部分共价接枝到溶胶-凝胶衍生的ormosil网络上,通过四乙氧基硅烷(TEOS)的共缩合制备出氧和温度感应的混合材料。为了比较,也制备了将[Ru(Phen)3]2+常规地物理掺入基质中的混合材料。利用傅里叶变换红外光谱(FT-IR)、荧光强度氧猝灭Stern-Volmer图、温度猝灭图和激发态寿命对所得到的混合材料进行了表征。近线性的Stern-Volmer图可以归因于荧光团在ormosil材料中的近似异质环境。结果表明,共价接枝样品对氧气更敏感,具有更高的感应灵敏度和更高的热激活能,与物理掺入的样品相比,因为这些Ru(II)分子通过CH2-Si键牢固地共价接枝到Si-O网络上,较少含有-OH基团。