二氧化钛溶胶凝胶基质修饰的DrugFET

Drudfet modified with titanium dioxide sol-gel matrix

制备了一种新型药物敏感场效应晶体管（DrugFET），该器件以四（十二烷基）碘化铵为定域体试剂，利用溶胶凝胶技术研制磺胺嘧啶敏感膜，将敏感膜与FET的延长栅极组装在一起，制成一种新型的化学传感器。敏感器件的线性范围为1．0×10^-2～4．3×10^-6mol／L，检出限为3．1×10^-6mol／L，平均斜率为62．3mV／dec，适宜的pH范围为1．2～5．6。将DrugFET用于样品分析，样品回收率为95．0％～101．2％，RSD为2．4％。

A new type of DrugFET for determination of sulfadiazine was prepared based on the titanium dioxide sol-gel technique with tetra-dodecyl ammonium iodide as an active material. The linear range of 1.0 x 10 -2 - 4. 3 x 10 -6mol/L with a detection lmit of 3.1 x 10-6 mol/L at pH 1.2 - 5.6 and a slope of 62. 3 mV/dec for sulfadiazlne were obtained. Besides, the DrugFET shows better selectivity, reproducibility and stability. The DrugFET was applied to the analysis of real samples, the recoveries were 95.0% - 101.2%, and relative standard deviation was 2. 4% （ n = 5 ）.