Novel Synthesis of porous BN/β-SiC/SnO 2 /In 2 O 3 Quaternary Nanocomposites and its Gas Sensing Properties under Different Working Temperatures

Abstract

The novel quaternary nanocomposite was composed of porous boron nitride, β-SiC fibers, SnO2, and In2O3, and their successful combination led to effective and highly stable gas sensing. The physical and chemical properties of the nanocomposites were analyzed using analytical techniques such as XRD, SEM, TEM-HRTEM, BET, XPS, PL, and Raman techniques. Especially, the first-principles calculations were performed to evaluate the proportion of the states occupied by the system at each energy level. The gas sensing capabilities of the quaternary nanocomposites were evaluated using CO2 and O2 gas purging at various temperatures. The usefulness of the β-SiC fiber and previously studied β-SiC/In2O3/SnO2 was altered by the outstanding electronic conductivity and chemical activity of the pBN/β-SiC/SnO2/In2O3 quaternary nanocomposites. At room temperature, the pBN-105 NCs displayed high resistivity and robust response to O2 gas but a weak response to CO2 gas. The sensor exhibited a robust sensitivity to both CO2 and O2 gases at high temperatures. In every gas-sensing test, the predicted quaternary nanocomposites displayed a strong resistivity and low current density. The effective charge transfer and separation properties, as well as the electron density of the sensor layer of the quaternary nanocomposites, allowed for better sensing under a variety of high-temperature variations, whereas the addition of MOs and porous boron nitride increased the usability of the β-SiC fiber.