Cobalt Doped Tin (IV) Oxide Nanorods: A Potential Ethanol Gas Sensor
DOI:
https://doi.org/10.11113/jomalisc.v3.45Keywords:
Co doped, tin (IV) oxide, nanorods, ethanol gas sensor, hydrothermalAbstract
The introduction of transitional metals into metal oxide matrices can lead to synergistic physiochemical properties compared to the pristine components, offering significant potential across various applications such as gas sensors, photocatalysts and energy storage. This study focuses on hydrothermal synthesis of cobalt-doped tin (IV) oxide (Co:SnO2) nanorods with different Co doping dosages ranging from 0.5–5 mol%. To investigate the physiochemical properties of the as-synthesized Co:SnO2, samples were analyzed by X-ray diffraction (XRD), high-resolution transmission electron microscopy with selected area electron diffraction (HRTEM/SAED) and X-ray photoelectron spectroscopy (XPS). The findings reveal that the Co dopant did not noticeably change the shape of SnO2 nanorods. Nevertheless, the size of the nanorods decreased, which is a common behavior observed with transition metal dopants. To study the sensing performance, the undoped SnO2 and 5Co:SnO2 nanorod samples were tested on 1000 ppm ethanol gas and N2 carrier gas at 450°C, the optimum operation temperature. The result indicates that the sensing response of 5Co:SnO2 nanorods recorded 3 times higher response, R0/Rg, 3300 compared to the undoped SnO2 nanorods sensor R0/Rg, 1100. This study suggests that the improvement in ethanol gas sensing performance can be attributed to the changes in physicochemical properties, such as particle size reduction, band gap narrowing, and the presence of oxygen vacancies.
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