Monodisperse ZnFe2O4 nanospheres synthesized by a nonaqueous route for a highly slective low-ppm-level toluene gas sensor

Monodisperse ZnFe 2 O 4 nanospheres were succesuffully synthesized via a nonaqueous route in benzyl alcohol at low temperaure of 200   °C. It was found that the ZnFe 2 O 4 is 7–16   nm in diameter with a large surface area of 87.40   m 2 /g. The gas sensor based on ZnFe 2 O 4 nanospheres shows a high pontential for detecting low-ppm-level toluene, exhibiting a good linearity ranging from 1 to 100   ppm with a high response (100   ppm:9.98) and excellent selectivity.