Development of An Optical Sensor Based on Sol-gel Doped with 2,6-Dichlorophenol Indophenol for Analysis of Ascorbic Acid

هدف از مطالعه حاضر تهيه فيلمي از شبكه SiO2 دوپ شده با شناساگر رنگي 2و6-دي كلرو فنول ايندوفنول (DCIP) با استفاده از تكنيك سل-ژل مي باشد. در ادامه پاسخ نوري حسگر ساخته شده به حضور اسكوربيك اسيد در محلول مورد بررسي قرار گرفته است. حسگر حاضر براي آناليز اسكوربيك اسيد در نمونه هاي دارويي مورد استفاده قرار گرفت.

In this work, an optical sensor for detection of ascorbic acid is described. The sensor is fabricated by casting and spin-coating silica sol-gel doped with 2,6-dichlorophenol indophenol on the glass plates. The sols are in turn obtained by acidic hydrolysis of various precursors such as tetraethoxysilane, triethoxymethylsilane and triethoxyoctylsilane in the presence of 2,6-dichlorophenol indophenol as dopant. Prepared sols then were coated on glass plates to form sol-gel films. UV-Vis spectrophotometric properties of 2,6-dichlorophenol indophenol doped in sol-gel films were studied and compared with in solution. At the optimum conditions the re sponse of film to ascorbic acid is fast and linear in 0.07 – 3.34 mmol L-1 range. Detection limit and relative standard deviation of presented sensor for determination ascorbic acid were 0.05 mmol L-1 and 1.32 %, respectively.