氟化改性干凝胶敏感材料光纤氧传感研究

Study on Optical Fiber Oxygen Sensing of Fluorinated Dry Gel Sensitive Materials

为了精确测量溶解氧(DO)浓度,提高传感器灵敏度和稳定性,文章采用改进的溶胶-凝胶技术,以钌(Ru)为荧光指示剂,研制了两种基于荧光猝灭原理的氟化改性干凝胶氧气敏感材料,分别为三氟丙基三甲氧基硅烷/正硅酸四乙酯(TFP-TriMOS/TEOS)和三氟丙基三甲氧基硅烷/1,2-双(三乙氧基硅基)乙烷(TFP-TriMOS/BTESE)氟化杂化干凝胶,采用浸渍涂膜法将敏感材料涂覆于塑料光纤表面制备氧气传感探头,并对其不同前驱体配比下的DO传感性能进行研究。实验结果表明,所制备的光纤氧传感探头均具有较好的DO传感性能,且检测下限分别为0.135和0.118 mg/L。与涂覆单一前驱体(TEOS、BTESE和TFP-TriMOS)的光纤氧传感探头相比,基于氟化改性干凝胶的光纤氧传感探头具有更高的线性度,以及更低的检测下限。对氟化改性DO传感探头的稳定性和在不同pH值下的抗干扰能力进行了研究,结果表明,所制备的两种光纤氧传感探头均具有较好的稳定性和抗干扰能力。

In order to accurately measure the Dissolved Oxygen(DO)concentration,and enhance the sensitivity and stability of sensor head,two fluorinated dry gel oxygen sensitive materials 3,3,3-Trifluoropropyltrimethoxy/Tetraethyl Orthosilicate(TFP-TriMOS/TEOS)and 3,3,3-Trifluoropropyltrimethoxy/1,2-Bis(triethoxysilyl)Ethane(TFP-TriMOS/BTESE)fluorinated hybrid dry gel dope with Ruthenium(Ru)complex were developed by improved sol-gel technology.Oxygen sensing head was made by dip coating plastic optical fiber into the above prepared sol-gel.Its oxygen sensing performance was studied under different precursor ratios.Experimental results show that all the fabricated DO sensing heads have good oxygen sensing performance,and the detection limits are 0.135 and 0.118 mg/L,respectively.Compared with the fiber optic oxygen sensing head coated with a single precursor(TEOS,BTESE and TFP-TriMOS),the fiber optic oxygen sensing head based on fluorinated dry gel shows higher linearity and lower detection lower limit.The stability of the fluorinated DO sensing head and the influence of pH the intensity of fluorescence signal was studied.The results show that the two kinds of fiber optic dissolved oxygen sensing head have good stability and anti-interference ability.