High Humidity Response of Sol-Gel-Synthesized BiFeO3 Ferroelectric Film

Yaming Zhang; Bingbing Li; Yanmin Jia

doi:10.3390/ma15082932

High Humidity Response of Sol-Gel-Synthesized BiFeO₃ Ferroelectric Film

Materials (Basel). 2022 Apr 17;15(8):2932. doi: 10.3390/ma15082932.

Authors

Yaming Zhang¹, Bingbing Li², Yanmin Jia¹

Affiliations

¹ School of Science, Xi'an University of Posts and Telecommunications, Xi'an 710048, China.
² School of Communication and Information Engineering, Xi'an University of Posts and Telecommunications, Xi'an 710048, China.

Abstract

In this work, a BiFeO₃ film is prepared via a facile sol-gel method, and the effects of the relative humidity (RH) on the BiFeO₃ film in terms of capacitance, impedance and current-voltage (I-V) are explored. The capacitance of the BiFeO₃ film increased from 25 to 1410 pF with the increase of RH from 30% to 90%. In particular, the impedance varied by more than two orders of magnitude as RH varied between 30% and 90% at 10 Hz, indicating a good hysteresis and response time. The mechanism underlying humidity sensitivity was analyzed by complex impedance spectroscopy. The adsorption of water molecules played key roles at low and high humidity, extending the potential application of ferroelectric BiFeO₃ films in humidity-sensitive devices.

Keywords: BiFeO3; ferroelectrics; humidity response; sol–gel preparation.

Abstract

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