Zhang Yaming, Li Bingbing, Jia Yanmin
School of Science, Xi'an University of Posts and Telecommunications, Xi'an 710048, China.
School of Communication and Information Engineering, Xi'an University of Posts and Telecommunications, Xi'an 710048, China.
Materials (Basel). 2022 Apr 17;15(8):2932. doi: 10.3390/ma15082932.
In this work, a BiFeO film is prepared via a facile sol-gel method, and the effects of the relative humidity (RH) on the BiFeO film in terms of capacitance, impedance and current-voltage (-) are explored. The capacitance of the BiFeO 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 BiFeO films in humidity-sensitive devices.
在本工作中，通过简便的溶胶-凝胶法制备了BiFeO薄膜，并从电容、阻抗和电流-电压（I-V）方面探究了相对湿度（RH）对BiFeO薄膜的影响。随着RH从30%增加到90%，BiFeO薄膜的电容从25 pF增加到1410 pF。特别是，在10 Hz时，当RH在30%至90%之间变化时，阻抗变化超过两个数量级，表明具有良好的滞后性和响应时间。通过复阻抗谱分析了湿度敏感的机理。水分子的吸附在低湿度和高湿度下都起着关键作用，拓展了铁电BiFeO薄膜在湿度敏感器件中的潜在应用。
