Sensing Behavior Study of Cobalt Zinc Ferrite Nanoparticles Against Acetone in Various Temperatures

The Cobalt zinc ferrite nanoparticles with diameters less than ۲۰ nm were prepared. By XRD (X-ray diffraction), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) the morphology and the structure of this ferrite were studied. The X-ray analysis shows the formation of manganese zinc ferrite in the spinel phase. SEM photograph is shown the spherical shape of nanoparticles. And the TEM confirmed the nanoscale dimensions of the samples. The cobalt zinc ferrite nanoparticles crystallite sizes, calculated by the Debye-Scherer formula, were found near ۱۳ nm. The sensitivity properties of this ferrite are investigated in a totally isolated plexi glass box. By injecting ۱ mL of liquid and vaporizing it, we will have ۲۰۰ ppm concentration of each sample in this box. Then the injected vapored sample in this box is exposed to the ferrite. After this step, the conductivity of the ferrite in a closed circuit was changed. By changing the sample type, amount of this conductivity was varied. Six gases were tested in this project: ethanol, nitrile alcohol, dimethyl formamide, carbon tetrachloride, acetonitrile, and acetone. Among these samples, the carbon tetrachloride had the best sensitivity performance. Finally, the sensor equation for carbon tetrachloride was extracted by applying different concentrations of it from ۲۰ to ۲۰۰ ppm.

کلیدواژه ها:

Acetone sensor ، ferrite ، Gas sensor ، cobalt zinc ferrite nanoparticle ، Sensitivity ، X–ray diffraction