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Carbon Felt/Carbon Nanotubes/Pani as pH Sensor

Published online by Cambridge University Press:  01 February 2011

Glaucio Ribeiro Silva
Affiliation:
glaucio_r@yahoo.com.br, University of São Paulo, Physics and Mathematics, Av. Bandeirantes 3900, Ribeirão Preto-SP, CA, 14040-901, Brazil
Elaine Yoshiko Matsubara
Affiliation:
elainematsubara@pg.ffclrp.usp.br, University of São Paulo, Chemistry, Av. Bandeirantes 3900, Ribeirão Preto-SP, CA, 14040-901, Brazil
Paola Corio
Affiliation:
paola@iq.usp.br, University of São Paulo, Chemistry, Av. Prof. Lineu Prestes 748, São Paulo, CA, 05508-900, Brazil
Jose Mauricio Rosolen
Affiliation:
rosolen@ffclrp.usp.br, University of São Paulo, Chemistry, Av. Bandeirantes 3900, Ribeirão Preto-SP, CA, 14040-901, Brazil
Marcelo Mulato
Affiliation:
mmulato@ffclrp.usp.br, University of São Paulo, Physics and Mathematics, Av. Bandeirantes 3900, Ribeirão Preto-SP, CA, 14040-901, Brazil, 551636024874, 551636024887
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Abstract

This work proposes the use of the composite carbon felt/carbon nanotube/Polyaniline as an alternative for applications as a pH sensor device. The carbon felt/carbon nanotube is an electronic conductivity material that was obtained from polymer felt (poliacrilonitrile felt) using oxidation and carbonization processes. The cup-stacked and bamboo-like tubes were grown on the fibers of carbon felt by chemical vapor decomposition method. The sensor was obtained by incorporating polyaniline (Pani) on the nanotubes present on the fibers of carbon felt/carbon nanotubes composite. The measuring process uses an EGFET (Extended Gate Field Effect Transistors) configuration, which is a derivation of the ISFET (Ion Sensitive Field Effect Transistor) - that is basically a chemical semiconductor sensor. The drain-current versus source-drain voltage is presented for varying pH concentrations from 2 up to 12.

Type
Research Article
Copyright
Copyright © Materials Research Society 2007

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References

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