Conduction mechanisms in SnO2 single-nanowire gas sensors: An impedance spectroscopy study

F. SCHIPANI; D. R. MILLER; M. A. PONCE; C. M. ALDAO; S. A. AKBAR; P. A. MORRIS; J. C. XU

SENSORS AND ACTUATORS B-CHEMICAL

ELSEVIER SCIENCE SA

Lugar: Amsterdam; Año: 2016 vol. 241 p. 99 - 108

0925-4005

Results of studies on single and multiple SnO2nanowire gas sensors with impedance spectroscopy arereported. Equivalent circuit modeling is used to draw fundamental conclusions about the dominant con-duction mechanism in single-nanowire sensors, where the diameter of the nanowire is found to play akey role. This is then extended to multiple-nanowire sensors. For single-nanowire sensors, I?V measure-ments are also used to demonstrate that the contribution from the electrode-nanowire contact to theoverall resistance changes with atmosphere and temperature. We find that for the randomly-orientatedmultiple-nanowire sensors, the main contribution to the resistance comes from the nanowire?nanowirejunction.