Abstract
Ultrafine ZnM 2O 4 (M = Fe, Co, Cr) powders have been successfully fabricated by using a novel polyoxyethylene lauryl ether + n-hexanol/ n-heptance/water (zinc nitrate + ferrum nitrate or cobalt nitrate or chromium nitrate) W/O microemulsion method. The composition and the structure of the powers have been investigated by means of XRD and TEM. The results show the as-received ZnM 2O 4 have spinel-type structure and the every size of the spherical particles are below 60 nm with good dispersity. The influence of temperature on the sensitivities, selectivities, and the response and recovery characteristics are tested. The results of gas sensing measurement show the ZnFe 2O 4 sensors have a high sensitivity, excellent selectivity and quick response behavior to Cl 2 gas compared with ZnCo 2O 4 and ZnCr 2O 4 sensors. The response of ZnFe 2O 4 to Cl 2 gas shows the resistance increase that indicates an n-type semiconductor behavior while ZnCo 2O 4 and ZnCr 2O 4 have p-type semiconductor characteristic.
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