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以无机盐为原料,液相法合成了铁酸锌(ZnFe_2O_4)纳米粉体,通过X射线衍射仪和透射电子显微镜等手段对粉体的晶体结构和形貌等进行表征。以十二烷基苯磺酸钠(SDBS)作为分散剂,配制SDBS分散ZnFe_2O_4溶液,利用旋转甩涂法将其固定于锡掺杂玻璃表面,制成SDBS分散ZnFe_2O_4薄膜,并利用紫外-可见光谱法检测其光学气敏性能。实验结果表明,粉体为尖晶石结构,平均粒径约为14nm。SDBS分散ZnFe_2O_4薄膜对H2S气体有较好的灵敏度,对体积分数为(×10-3(V/V))的H_2S气体透光率变化可达1.190%,相对透光率为0.01202;可检测出H_2S气体的最低体积分数为1.0×10-7(V/V)。
Zinc ferrite (ZnFe 2 O 4) nano-powders were synthesized by liquid-phase method using inorganic salts as raw materials. The crystal structure and morphology of the powders were characterized by X-ray diffraction and transmission electron microscopy. SDBS dispersed ZnFe2O4 solution was prepared by using sodium dodecylbenzenesulfonate (SDBS) as dispersant and then immobilized on the surface of tin-doped glass by spin-coating method to prepare SDBS-dispersed ZnFe2O4 thin films. The UV-Vis spectra Method to test its optical gas sensitivity. The experimental results show that the powder is spinel structure, the average particle size is about 14nm. SDBS dispersed ZnFe_2O_4 thin films have better sensitivity to H2S gas, the transmittance of H_2S gas with the volume fraction of (× 10-3 (V / V)) can reach 1.190% and the relative transmittance is 0.01202; The lowest volume fraction of H 2 S gas is 1.0 × 10-7 (V / V).