Abstract
Sheet stacked ZnFe2O4 hollow spheres have been synthesized through a simple hydrothermal method using Zn(CH3COO)2 and Fe(NO3)3 as Zn and Fe sources, respectively. Then a series of Ag activated ZnFe2O4 composites are prepared. XRD patterns demonstrate that the as-synthesized powders are pure ZnFe2O4. FE-SEM images exhibit that the as-synthesized Ag-ZnFe2O4 particles are spherical with the diameter of 800–1000 nm. TEM images demonstrate that the as-synthesized Ag-ZnFe2O4 are hollow sphere structure. The gas sensing tests show that 0.25 wt% Ag-ZnFe2O4 has the highest responses to 100 ppm acetone vapor at 175 °C, and response time and recovery time are 17 and 148 s respectively. In addition, 0.25 wt% Ag-ZnFe2O4 has a good selectivity to acetone. Ag activated ZnFe2O4 composites exhibit excellent acetone gas sensing properties and gives potential for the detection of acetone vapor in the application of practical industrial processes and health control.
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