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4. Conclusions The primary goal of showing that zeolite can add se- lectivity to a sensor has been achieved. The unique new sensor design provides a suitable substrate for the ap- plication of zeolites and their subsequent regrowth to form a solid dense film. The zeolite Na+-A film pro- duced was shown to limit the response of the ampero- metric sensor to carbon dioxide while maintaining high sensitivity to oxygen. Although it is unlikely that true molecular sieving occurred, based on the size of the gas molecule versus the pore dimensions of the zeolite, a level of selectivity of 40 was achieved and may be due to limitations based on Knudsen diffusion. The ability to produce specific zeolite films on sensor substrates generates new possibilities for increasing the selectiv- ity of many types of gas sensors for a wide range of practical applications. Acknowledgements The authors wish to thank Gary Hunter from the NASA Glenn Research Center and Mark White (Georgia Tech) for their participation and the funding provided through NASA-GSRP. References 1. J. BINDER, Sens. Actuators A 31 (1992) 60. 2. N. KOTO, Y. HAMADA and K. KURACHI, in “Automo- tive Electronics Series: Sensors and Transducers,” edited by Ronald K. Jurgen (Soc. of Automotive Engineers Inc. Warrendale, PA, 1997) p. 5. 3. Y. NAKANONCHI, H. KAROSOMA, M. HASEI, Y. Y AN and A. KUNIMOTO, in “Automotive Electronics Series: Sensors and Transducers,” edited by Ronald K. Jurgen (Soc. of Automotive Engineers Inc. Warrendale, PA, 1997) p. 157. 4. AI QUOC PHOM and ROBERT S. GLASS, J. Electrochem. Soc. 144(11) (1997) 3929. 5. A. MENNE and W. WEPPNER, Solid State Ion. 40/41 (1990) 468. 6. I. KOCEMBA and T. P ARYJCZAK, Thin Solid Films 272 (1996) 15. 7. I. SA Y AGO, J. FUTIERREZ and J. AGAPITO, Sens. Actu- ators B 26/27 (1995) 19. 8. F. DI RENZO, F. FAJULA, F. FIGUERAS, S. NICOLAS and T. DES COURIERS, in “Zeolites: Facts, Figure, Future,” edited by P. A. Jacobs and R. A. van Santen (Elsevier Science Publications, Amsterdam, 1989) p. 119. 9. JULIUSZ WARZYWODA, NURCAN BAC, JACOBUS C. JANSEN and ALBERT SACCO, JR., J. Cryst. Growth 220 (2000) 140. 10. HAAS,etal.USpatentno.5,143,696. 11. T AKAHASHI, et al. US patent no. 5,948,966. 12. ZUOY AN PENG, MEILIN LIU and ED BALKO, Sens. Actu- ators B 3598 (2000) 1. 13. LAURA C. BOUDREAU, JULIA A. KUCK andMICHAEL TSAP A TSIS, J. Membr. Sci. 152 (1999) 41. 14. PETER M. BUDD, GRAHAM J. MYATT, COLIN PRICE and STUART W. CARR, Zeolites 14 (1994) 198. 15. B. J. SCHOEMAN, J. STERTE andJ. E. OTTERSTEDT, ibid. 14 (1994) 110. 16. B. J. SCHOEMAN, J. STERTE andJ. E. OTTERSTEDT, ibid. 14 (1994) 208. 17. LAURA C. BOUDREAU and MICHAEL TSAPATSIS, Chem. Mater. 9(8) (1997) 1705. Received 16 April and accepted 1 August 2003 CHEMICAL SENSORS 4317PDF Image | Development of a selective gas sensor utilizing zeolite membrane
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