Abstract
Novel nanosized BaCO3 structures were manufactured by a one-pot thermal evaporation system. Ba of 10 mg as source material was used as source material. The manufacturing has occurred at a low vacuum of 0.65 and 0.85 Torr and a temperature of 850 degrees C in the existence of partial oxygen. The nanostructures were characterized by FE-SEM, XRD, and EDX techniques. XRD patterns were described as orthorhombic crystalline nanostructure of BaCO3. The nanostructures were defined as flower-like and Datura-like nanostructures. The Datura-like nanostructure contains nanowire branches of 20-50 nm in diameter with a length of 5.0 mu m. In this paper, we show that this novel BaCO3 nanostructure is a new device that can detect NO2 at various temperatures in chemiresistive mode. The planned sensor was deeply investigated toward NO2 at working temperatures of 150-350 degrees C and concentrations of 0.5-10 ppm. The sensor response was 315% toward 2 ppm of NO2 gas at 250 degrees C, and the limit of detection was found to be 500 ppb. The sensor proved reversibility to NO2 in terms of repeating the output signal at various gas concentrations of 1.0-10 ppm.