Open Access

A pH sensor based on electric properties of nanotubes on a glass substrate

  • Seiji Takeda1Email author,
  • Motonori Nakamura1,
  • Atsushi Ishii1,
  • Agus Subagyo2,
  • Hirotaka Hosoi1,
  • Kazuhisa Sueoka2 and
  • Koichi Mukasa1
Nanoscale Research Letters20072:207

DOI: 10.1007/s11671-007-9053-9

Received: 28 December 2006

Accepted: 5 March 2007

Published: 30 March 2007

Abstract

We fabricated a pH-sensitive device on a glass substrate based on properties of carbon nanotubes. Nanotubes were immobilized specifically on chemically modified areas on a substrate followed by deposition of metallic source and drain electrodes on the area. Some nanotubes connected the source and drain electrodes. A top gate electrode was fabricated on an insulating layer of silane coupling agent on the nanotube. The device showed properties of ann-type field effect transistor when a potential was applied to the nanotube from the top gate electrode. Before fabrication of the insulating layer, the device showed that thep-type field effect transistor and the current through the source and drain electrodes depend on the buffer pH. The current increases with decreasing pH of the CNT solution. This device, which can detect pH, is applicable for use as a biosensor through modification of the CNT surface.

Keywords

Carbon nanotube Field effect transistor pH Glass Immobilization

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Declarations

Acknowledgements

This work was supported by the Japan Securities Scholarship Foundation, the Technology and New Energy and Industrial Technology Development Organization (NEDO), and Special Coordination Funds for Promoting Science.

Authors’ Affiliations

(1)
Creative Research Initiative “Sousei”, Hokkaido University
(2)
Graduate School of Information Science and Technology, Hokkaido University

References

  1. Cui Y, Wei Q, Park H, Lieber CM: Science. 2001, 293: 1289. ; COI number [1:CAS:528:DC%2BD3MXmtFCrtrs%3D]; Bibcode number [2001Sci...293.1289C] 10.1126/science.1062711View ArticleGoogle Scholar
  2. Patolsky F, Zheng G, Hayden O, Lakadamyali M, Zhuang X, Lieber CM: Proc. Natl. Acad. Sci. USA.. 2004, 101: 14017. ; COI number [1:CAS:528:DC%2BD2cXosVylsro%3D]; Bibcode number [2004PNAS..10114017P] 10.1073/pnas.0406159101View ArticleGoogle Scholar
  3. Staii C, Johnson J, Alan T: Nano Lett.. 2005, 5: 1774. COI number [1:CAS:528:DC%2BD2MXosVGgsbw%3D] 10.1021/nl051261fView ArticleGoogle Scholar
  4. Chen RJ, Choi HC, Bangsaruntip S, Yenilmez E, Tang X, Wang Q, Chang Y-L, Dai H: J. Am. Chem. Soc. 2004, 126: 1563. COI number [1:CAS:528:DC%2BD2cXksFCitA%3D%3D] 10.1021/ja038702mView ArticleGoogle Scholar
  5. Takeda S, Sbagyo A, Sakoda Y, Ishii A, Sawamura M, Sueoka K, Kida H, Mukasa K, Matsumoto K: Biosens. Bioelectron. 2005, 21: 201. COI number [1:CAS:528:DC%2BD2MXlsVClt74%3D] 10.1016/j.bios.2004.08.030View ArticleGoogle Scholar
  6. Kong J, Franklin NR, Zhou C, Chapline MG, Peng S, Cho K, Dai H: Science. 2000, 287: 622. ; COI number [1:CAS:528:DC%2BD3cXovVWgtA%3D%3D]; Bibcode number [2000Sci...287..622K] 10.1126/science.287.5453.622View ArticleGoogle Scholar
  7. Wang J: Analyst. 2005, 130: 421. ; COI number [1:CAS:528:DC%2BD2MXitlOlt78%3D]; Bibcode number [2005rems.book.....W] 10.1039/b414248aView ArticleGoogle Scholar
  8. Modi A, Koratkar N, Lass E, Wei B, Ajayan PM: Nature. 2003, 424: 171. ; COI number [1:CAS:528:DC%2BD3sXlt1CktLc%3D]; Bibcode number [2003Natur.424..171M] 10.1038/nature01777View ArticleGoogle Scholar
  9. Yu Q, Qin G, Li H, Xia Z, Nian Y, Pei S-S: J. Phys. Chem. B. 2006, 110: 22676. COI number [1:CAS:528:DC%2BD28XhtFSit7bJ] 10.1021/jp064875xView ArticleGoogle Scholar
  10. Zhu J, Yudasaka M, Zhang M, Kasuya D, Iijima S: Nano Lett. 2003, 3: 1239. COI number [1:CAS:528:DC%2BD3sXms1Cjs7g%3D] 10.1021/nl034459dView ArticleGoogle Scholar
  11. Choi KH, Bourgoin JP, Auvray S, Esteve D, Duesberg GS, Roth S, Burgharm M: Surf. Sci.. 2000, 462: 195. COI number [1:CAS:528:DC%2BD3cXls1Wmtrg%3D] 10.1016/S0039-6028(00)00609-9View ArticleGoogle Scholar
  12. Auvray SP, Derycke V, Goffman M, Filoramo A, Jost O, Bourgoin J-P: Nano Lett. 2005, 5: 451. COI number [1:CAS:528:DC%2BD2MXhtFSntrc%3D] 10.1021/nl048032yView ArticleGoogle Scholar
  13. Lee M, Im J, Myung S, Kang J, Huang L, Kwon Y-K, Hong S: Nature Nanotechnology. 2006, 1: 67. 10.1038/nnano.2006.46View ArticleGoogle Scholar
  14. Jhi S-H, Louie SG, Cohen ML: Phys. Rev. Lett. 2000, 85: 1710. ; COI number [1:CAS:528:DC%2BD3cXlslGntLg%3D]; Bibcode number [2000PhRvL..85.1710J] 10.1103/PhysRevLett.85.1710View ArticleGoogle Scholar
  15. Shim M, Javey A, Kam NWS, Dai H: J. Am. Chem. Soc. 2001, 123: 11512. COI number [1:CAS:528:DC%2BD3MXnvVGnurk%3D] 10.1021/ja0169670View ArticleGoogle Scholar

Copyright

© to the authors 2007