Nanotextured Organic Light Emitting Diode Based Chemical Sensor
In this paper we present the design, fabrication and development of an optical, label free chemical sensor technology based on the portable "lab-on-a-chip" format. This sensor technology employs the use of nanotextured thin film surfaces packaged in a stacked vertical array format functioning as organic light emitting diodes (OLED's). The intensity of emitted light from OLED's is modulated as a function of the analyte concentration. The OLEDs were fabricated in a layer by layer configuration with an indium tin oxide anode and an aluminum cathode and TPD as a hole transport layer and AlQ3 as an electron transport layer. ITO/TPD/AlQ3/Al sandwich OLEDs were converted into sensors by converting the cathode (Al) surface into an active sensing area. The prototype sensor performance was evaluated in the detection of two aliphatic hydrocarbons-ethanol and methanol. The detection sensitivity was found to be in the lower parts per million (ppm). The limit of detection for ethanol was 1 ppm and that for methanol was 10 ppm. Chemical detection was achieved upon the comparison of turn-on voltages and the intensities of the output light from the OLED when chemical was being injected onto the cathode surface, with that of a standard OLED turn-on voltage and intensity. The modulation in these two parameters with respect to the standard was determined as a measure of detection of the two chemical species.
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Document Type: Research Article
Publication date: 2009-11-01
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- Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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