Impedance spectroscopy has been used to identify analytes in semiconducting metallophthalocyanine thin films. Above a critical concentration, the magnitudes of the high frequency conductivity changes are invariant with concentration but distinct for different analytes and can be used for analyte identification. The analyte-induced ac conductivity changes above have been converted to frequency shifts in a circuit resonance and used to differentiate methanol, ethanol, and isopropanol vapors in a nitrogen carrier gas. The analyte-induced changes in the conductivity are consistent with analyte-induced changes in the charge relaxation times.
REFERENCES
1.
J.
Janata
and M.
Josowicz
, Nat. Mater.
2
, 19
(2003
).2.
T.
Someya
, H. E.
Katz
, A.
Gelperin
, A. J.
Lovinger
, and A.
Dodabalapur
, Appl. Phys. Lett.
81
, 3079
(2002
).3.
Z. T.
Zhu
, J. T.
Mason
, R.
Dieckmann
, and G. G.
Malliaras
, Appl. Phys. Lett.
81
, 4643
(2002
).4.
L.
Wang
, D.
Fine
, and A.
Dodabalapur
, Appl. Phys. Lett.
85
, 6386
(2004
).5.
A. W.
Snow
and W.
Barger
, in Phthalocyanines Properties and Applications
, edited by A. B. P.
Lever
(Wiley
, New York, 1989
), Vol. 1
, p. 341
.6.
S. V.
Patel
, T. E.
Mlsna
, B.
Fruhberger
, E.
Klaassen
, S.
Cemalovic
, and D. R.
Baselt
, Sens. Actuators B
96
, 541
(2003
).7.
8.
J.
Gutierrez
, L.
Ares
, M. C.
Horillo
, I.
Sayago
, J.
Agapito
, and L.
Lopez
, Sens. Actuators B
4
, 359
(1991
).9.
F.
Josse
, R.
Lukas
, R. N.
Zhou
, S.
Schneider
, and D.
Everhart
, Sens. Actuators B
36
, 363
(1996
).10.
R. C.
Hughes
, W. G.
Yelton
, K. B.
Pfeifer
, and S. V.
Patel
, J. Electrochem. Soc.
148
, H37
(2001
).11.
K. A.
Miller
, R. D.
Yang
, M. J.
Hale
, J.
Park
, B.
Fruhberger
, C. N.
Colesniuc
, I. K.
Schuller
, A. C.
Kummel
, and W. C.
Trogler
, J. Phys. Chem. B
110
, 361
(2006
).12.
M. E. H.
Amrani
, K. C.
Persaud
, and P. A.
Payne
, Meas. Sci. Technol.
6
, 1500
(1995
).13.
H. C. F.
Martens
, J. N.
Huiberts
, and P. W. M.
Blom
, Appl. Phys. Lett.
77
, 1852
(2000
).14.
G.
Blatter
and F.
Greuter
, Phys. Rev. B
33
, 3952
(1986
).15.
C.
Tanase
, P. W. M.
Blom
, D. M.
de Leeuw
, and E. J.
Meijer
, Phys. Status Solidi A
201
, 1236
(2004
).16.
F.
Iwatsu
, T.
Kobayashi
, and N.
Uyeda
, J. Phys. Chem.
84
, 3223
(1980
).© 2006 American Institute of Physics.
2006
American Institute of Physics
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