Nanocrystalline iron manganite prepared by sol–gel self-combustion method for sensor applications
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The nanocrystalline iron manganite was be successfully synthesized, for capacitive humidity sensor application, by sol–gel self-combustion method using polyvinyl alcohol as colloidal medium, followed by heat treatment. The best performances as humidity sensor were found, at working frequency of 100 Hz: a high sensitivity over a wide range of relative humidity, 11–98% RH (the capacity increases by over 40 times); a good linearity of the logC vs. RH characteristics over the whole RH range, for all used frequencies. The sensor exhibits very small hysteresis, lower sensitivity to temperature, keeping linear characteristics and a short response time. The investigated material holds promise for humidity monitoring applications, taking into account the low cost, a wide range of relative humidity and a low-contamination impact.
This work was partially supported by the Project No. 86//04-4-1121-2015/2020, JINR-RO 2018.
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