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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/25320

Title: Fabrication of PDMS-Based Nitrite Sensors Using Teflon AF Coating Microchannels
Authors: Chih-Wei Wu;Gwo-Ching Gong
Contributors: NTOU:Institute of Marine Environmental Chemistry and Ecology
Keywords: Nitrite sensor;Teflon;polydimethylsiloxane (PDMS)
Date: 2008-05
Issue Date: 2011-10-20T08:22:15Z
Publisher: IEEE Sensors Journal
Abstract: abstract:This study shows a novel polydimethylsiloxane (PDMS) nitrite sensor using liquid-core waveguide techniques. A 6 cm straight and Teflon AF 1601S coated PDMS microchannel (600 mum width and depth) replicated from a SU-8 master and sealed with a glass slide with the same coating. This formed a low index of refraction channel in which a high index aqueous solution was flowed. Light generated by a fiber-coupled tungsten halogen lamp propagated by total internal reflection to the end of the channel where the light was detected using a palm-size CCD array spectrometer. The result shows a dramatic difference between channels with and without a Teflon coating. The absorbance response of this sensor varies linearly with concentration and adheres to Beer's law. Moreover, calculations of absorbance using this sensor are in excellent agreement with a commercial spectrometer. This innovative technique provides a potentially low-cost and high efficient approach to fill the inspection technology gap between in situ and laboratory analyses. It is believed that the novel PDMS-based nitrite sensor is expected to give an impact to the aqueous inspection and to create a highly value-added technology in optical test and measurement industry.
Relation: 8(5), pp.465-469
URI: http://ntour.ntou.edu.tw/handle/987654321/25320
Appears in Collections:[海洋環境與生態研究所] 期刊論文
[機械與機電工程學系] 期刊論文

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