Thin-film organic photodiodes as integrated detectors for microscale chemiluminescence assays

详细信息    查看全文

• 作者：Oliver Hofmann ; Paul Miller ; Paul Sullivan ; Timothy S. Jones ; John C. deMello ; Donal D.C. Bradley ; Andrew J. deMello
• 关键词：Organic photodiode ; Microchip ; Chemiluminescence ; Microfluidic
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2005
• 出版时间：13 May 2005
• 年：2005
• 卷：106
• 期：2
• 页码：878-884
• 全文大小：220 K

文摘

We report the use of thin-film organic photodiodes as integrated optical detectors for microscale chemiluminescence. The copper phthalocyanine–fullerene (CuPc–C₆₀) small molecule photodiodes have an external quantum efficiency of 30 % at 600–700 nm, an active area of 2 mm × 8 mm and a total thickness of 2 mm. Simple detector fabrication, based on layer-by-layer vacuum deposition, allows facile integration with planar chip-based systems. To demonstrate the efficacy of the approach, CuPc–C₆₀ photodiodes were used to monitor a peroxyoxalate based chemiluminescence reaction (PO-CL) within a poly(dimethylsiloxane) (PDMS) microfluidic device. Optimum results were obtained for applied reagent flow rates of 25 μL/min, yielding a CL signal of 8.8 nA within 11 min. Reproducibility was excellent with typical relative standard deviations (R.S.D.) below 1.5 % . Preliminary quantitation of hydrogen peroxide yielded a detection limit of 1 mM and linearity over at least three decades. With improved sensitivity and when combined with enzymatic assays the described integrated devices could find many applications in point-of-care diagnostics.