Conduction mechanisms and thermoelectric applications of La1-xSrxCoO3 nanofibers
Source abstract
Abstract
Single-phase La1-xSrxCoO3 (x = 0, 0.01, 0.03, 0.05, 0.07, and 0.1) nanofibers were synthesized via electrospinning technique. Different characterization techniques were employed to characterize the electrospun nanofibers. SEM was used to observe the morphology and size of the electrospun nanofibers, and the diameter of all fabricated nanofibers was found in the nanometer (nm) range. The XRD patterns of all the samples after heat treatment at 600 °C confirm the single-phase formation of La1-xSrxCoO3 (x = 0, 0.01, 0.03, 0.05, 0.07, and 0.1) nanofibers. The single phase of all the samples was also confirmed by FTIR spectroscopy and had good agreement with XRD results. All the fabricated samples’ thermal behavior was studied using TG/DTA, and all samples showed thermal stability at ≤ 600 °C. The single-phase La1-xSrxCoO3 (x = 0, 0.01, 0.03, 0.05, 0.07, and 0.1) nanofibers-based devices were fabricated on inter-digitated electrodes, and IV characteristics curves of all the fabricated devices show that La1-xSrxCoO3 (x = 0, 0.01, 0.03, 0.05, 0.07, and 0.1) nanofibers exhibit semiconductor-like behavior. The electrical conductivity of all the samples was calculated and found to decrease with increasing concentration of Sr doping. In all samples, the dominant conduction mechanism is ohmic at low voltage, while space-charge-limited current is the dominant conduction mechanism at high voltage and low temperature. The Seebeck coefficient of all the fabricated devices was calculated and found to increase with increasing Sr concentration and temperature.
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Research context
OpenAlex topics: Advanced Thermoelectric Materials and Devices · Gas Sensing Nanomaterials and Sensors · Transition Metal Oxide Nanomaterials
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