Issue 1, 2007
From the journal:

Lab on a Chip

Integrated thin-film polymer/fullerene photodetectors for on-chip microfluidic chemiluminescence detection

Xuhua Wang,ac   Oliver Hofmann,bc   Rupa Das,a   Edward M. Barrett,a   Andrew J. deMello,bc   John C. deMello*bc  and  Donal D. C. Bradley*ac  

* Corresponding authors

a Experimental Solid State Physics Group, Blackett Laboratory, Imperial College London, United Kingdom
E-mail: d.bradley@imperial.ac.uk

b Electronic Materials Group, Department of Chemistry, Imperial College London, United Kingdom
E-mail: j.demello@imperial.ac.uk

c Molecular Vision Ltd, Imperial BioIncubator, Imperial College London, United Kingdom

Abstract

We report the use of solution-processed thin-film organic photodiodes for microscale chemiluminescence. The active layer of the photodiodes comprised a 1 : 1 blend by weight of the conjugated polymer poly(3-hexylthiophene) [P3HT] and [6,6]-phenyl-C61-butyric acid-methylester [PCBM]—a soluble derivative of C60. The devices had an active area of 1 mm × 1 mm, and a broad-band response from 350 to 700 nm, with an external quantum efficiency of more than 50% between 450 and 550 nm. The photodiodes have a simple layered structure that permits facile integration with planar chip-based systems. To evaluate the suitability of the organic devices as integrated detectors for microscale chemiluminescence, a peroxyoxalate based chemiluminescence reaction (PO-CL) was monitored within a poly(dimethyl-siloxane) (PDMS) microfluidic device. Quantitation of hydrogen peroxide indicated excellent linearity and yielded a detection limit of 10 µM, comparable with previously reported results using micromachined silicon microfluidic chips with integrated silicon photodiodes. The combination of organic photodiodes with PDMS microfluidic chips offers a means of creating compact, sensitive and potentially low-cost microscale CL devices with wide-ranging applications in chemical and biological analysis and clinical diagnostics.

Graphical abstract: Integrated thin-film polymer/fullerene photodetectors for on-chip microfluidic chemiluminescence detection

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Article information

DOI
https://doi.org/10.1039/B611067C
Article type
Paper
Submitted
01 Aug 2006
Accepted
21 Sep 2006
First published
17 Oct 2006

Lab Chip, 2007,7, 58-63

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Integrated thin-film polymer/fullerene photodetectors for on-chip microfluidic chemiluminescence detection

X. Wang, O. Hofmann, R. Das, E. M. Barrett, A. J. deMello, J. C. deMello and D. D. C. Bradley, Lab Chip, 2007, 7, 58 DOI: 10.1039/B611067C

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