Commenced in January 2007
Paper Count: 31103
Synthesis and Fluorescence Spectroscopy of Sulphonic Acid-Doped Polyaniline When Exposed to Oxygen Gas
Abstract:Three sulphonic acid-doped polyanilines were synthesized through chemical oxidation at low temperature (0-5 oC) and potential of these polymers as sensing agent for O2 gas detection in terms of fluorescence quenching was studied. Sulphuric acid, dodecylbenzene sulphonic acid (DBSA) and camphor sulphonic acid (CSA) were used as doping agents. All polymers obtained were dark green powder. Polymers obtained were characterized by Fourier transform infrared spectroscopy, ultraviolet-visible absorption spectroscopy, thermogravimetry analysis, elemental analysis, differential scanning calorimeter and gel permeation chromatography. Characterizations carried out showed that polymers were successfully synthesized with mass recovery for sulphuric aciddoped polyaniline (SPAN), DBSA-doped polyaniline (DBSA-doped PANI) and CSA-doped polyaniline (CSA-doped PANI) of 71.40%, 75.00% and 39.96%, respectively. Doping level of SPAN, DBSAdoped PANI and CSA-doped PANI were 32.86%, 33.13% and 53.96%, respectively as determined based on elemental analysis. Sensing test was carried out on polymer sample in the form of solution and film by using fluorescence spectrophotometer. Samples of polymer solution and polymer film showed positive response towards O2 exposure. All polymer solutions and films were fully regenerated by using N2 gas within 1 hour period. Photostability study showed that all samples of polymer solutions and films were stable towards light when continuously exposed to xenon lamp for 9 hours. The relative standard deviation (RSD) values for SPAN solution, DBSA-doped PANI solution and CSA-doped PANI solution for repeatability were 0.23%, 0.64% and 0.76%, respectively. Meanwhile RSD values for reproducibility were 2.36%, 6.98% and 1.27%, respectively. Results for SPAN film, DBSAdoped PANI film and CSA-doped PANI film showed the same pattern with RSD values for repeatability of 0.52%, 4.05% and 0.90%, respectively. Meanwhile RSD values for reproducibility were 2.91%, 10.05% and 7.42%, respectively. The study on effect of the flow rate on response time was carried out using 3 different rates which were 0.25 mL/s, 1.00 mL/s and 2.00 mL/s. Results obtained showed that the higher the flow rate, the shorter the response time.
Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1063288Procedia APA BibTeX Chicago EndNote Harvard JSON MLA RIS XML ISO 690 PDF Downloads 2083
 P. Kiattiburr, L.Tarachiwin, L. Ruangchuan, A. Sirivat, and J. Schwank, "Electrical conductivity responses of polyaniline film to SO2- N2 mixtures: effect of dopants type & doping level". ,vol. 53, pp. 29-37, 2002.
 H.S. Nalwa, Handbook of Organic Concuctive Molecules and Polymer. England : John Wiley & Sons. 1997.
 A.Z. Sadek, W.Wlodarski, K. Kalantar-Zadeh, C. Baker, and R.B. Kaner. "Doped and dedoped polyaniline nanofiber based conductometric hydrogen gas sensors", Sensors and Actuators A: Physical, vol. 139, pp. 53-57. 2007.
 J. Yue, and A. J. Epstein, "Synthesis of self-doped conducting polyaniline. "J. Am. Chem. Soc., vol. 112, pp. 2800-2801, 1990.
 S. Koul, S. K. Dhawan, and R.Chandra, "Compensated sulphonated polyaniline-correlation a processibility and crystalline structure". Synth. Metals", vol. 124, pp. 295-299, 2001.
 J. Stejskal, P. Kratochlvil, and A. D. Jenkins, "The formation of polyaniline and the nature of its structures", Polymer, vol. 37 no.2, pp. 367-369, 1996.
 X. R. Zeng, and T. M. Ko, "Structured and properties of chemically reduced polyaniline-, Polymer; vo. 39, no. 5 , pp. 1187-1195, 1998.
 F. Lux, "Properties of electronically conductive polyaniline : a comparison between well-known literature data and some recent experimental findings", Polymer,; vo. 35, no. 14, pp. 2915- 2936, 1994.
 M.G. Han, Y.J Lee, S.W. Byun, and S.S Im, "Physical properties and thermal transition of polyaniline film", Synthetic Metals,vol. 124, pp. 337-343, 2001.
 L. Ding, X. Wang, and R.V. Gregory, "Thermal properties of chemically synthesized polyaniline (EB) powder", Synthetic Metals,vol. 104, pp. 73-78, 1999.
 P. G. Rodrigues, G. P. Souza, J. D Mata Neto,. and L. "Akeelrud, Thermal treatment and dynamic mechanical thermal properties of polyaniline", Polymer; vol. 43, pp. 5493-5499, 2002.
 N. Kuramoto and A. Tomita, "Aqueous polyaniline suspensions: chemical oxidative polymerization of dodecylbenzene-sulfonic acid aniline salt- Polymer,; vo. 38, pp. 3055-3058, 1997.
 E. Banka and W. Luzny, "Structural properties of polyaniline protonated with camporsulfonic acidÔÇÿ, Synthetic Metals, vol. 101, pp. 715-716, 1999.
 M. Kamaliah and A. R. Noorsaadah, Kaedah spektroskopi dalam pengenalpastian sebatian organik. Kuala Lumpur: Penerbit Universiti Malaya, 1997.
 F. S. Mehamod, R. Daik, and A.Musa, "Poly(1,3-phenylene diphenylvinylene), as sensing reagent for oxygen gas detection" Malaysian Journal of Chemistry, vol. 4 , no.1, pp. 035-040, 2002.
 Y.G. Chen, D.Zhao, Z. K. He, and A.P. Ai, "Fluoresecence quenching of water-soluble conjugated polymer by metal cations and its application in sensor", Spectrochimica Acta Part A. vol. 66, pp. 448- 452, 2007.
 H. L. F Eduardo and W. M. Azevado, "Polyaniline-poly(vinyl alcohol) composite as an optical recording material", Synthetic Metals, vol. 28, pp. 149-154. 2002.
 H.W. Hobart, L.M. Lynne, A.D John, and A.S. Frank, Kaedah Analisis Beralatan. Jilid 1. Terjemahan Pauzi Abdullah, Shamsinar & Wan Amizah (In Malay language). Kuala Lumpur: Dewan Bahawa dan Pustaka, 1993.