Synthesize and Characterization of Hollow and Core/Shell Based on CeO2 as a Alcohol Sensor

Abstract

In this study, CeO2 hollow spherical nanoparticles, CeO2/SiO2 @ CeO2 core/shell composites,<br />and hollow CeO2/SiO2 sensors were synthesized and their microstructures were researched by<br />FT-IR, XRD, FESEM, EDX and BET analyses. The peaks observed in the FT-IR spectra of the synthesized<br />samples corresponded to Ce-O stretching vibration (ca. 566 cm-1) and O-Si-O bending<br />vibration (ca. 470 cm-1). XRD diffraction patterns showed peaks at 2θ values in the 28.95° ,<br />33.74°, 47.75° , 57.04°, 59.52° ,and 69.4° confirming cubic phase of CeO2. The FESEM images<br />showed that the particle shape was approximately spherical. The results of BET showed that,<br />surface area of the CeO2 hollow spherical nanoparticles, CeO2/SiO2 @ CeO2 and hollow CeO2/<br />SiO2 core/shell particles were 102.78, 80.49, and 119.71 m2/g, respectively. The nanosized<br />metal oxides were used to quantitatively and qualitatively identify 1-propanol, 2-propanol,<br />ethanol and methanol. The results showed that, the hollow CeO2/SiO2 core/shell was of larger<br />potentials for qualitative identification of 1-propanol and quantitative measurement of 2<br />-propanol and ethanol.