Solvent thermal synthesis and gas-sensing properties of Fe-doped ZnO

In this study, pure ZnO microbullets, ZnO-ZnFe(2)O(4) composite, and ZnO-Fe(2)O(3)-ZnFe(2)O(4) composite with micron structured balloons, rods, and particles were prepared by a simple solvent thermal process using methanol or ethanol as solvents. The influence of solvents on the composition and morphology of the products was studied, and their gas-sensing properties were also investigated. The morphology of ZnO microbullets synthesized in ethanol is similar to but more uniform than that of ZnO microbullets synthesized in methanol. The Fe-doped ZnO synthesized in ethanol contains many micron particles homogeneously dispersing on the surface of the microbullets, which is composed of hexagonal wurtzite ZnO and franklinite ZnFe(2)O(4), while Fe-doped ZnO prepared in methanol consists of micron structured balloons, rods, and particles, which is composed of hexagonal wurtzite ZnO, hematite Fe(2)O(3), and franklinite ZnFe(2)O(4). Compared with pure ZnO and ZnO-ZnFe(2)O(4) composite, the ZnO-Fe(2)O(3)-ZnFe(2)O(4) composite presented high response, rapid response/recovery characteristics, good selectivity, and excellent stability to acetone at relatively low operating temperature of 190 A degrees C. This sensor could detect acetone in wide range of 1-1000 ppm, which was expected to be a promising gas sensor for detecting acetone.