偏锡酸锌纳米材料的制备及其HCHO气敏性研究

Preparation and HCHO-sensing Properties of ZnSnO_3 Nano-oxides

采用水热法在不同条件下制得3种不同形貌的纳米偏锡酸锌(ZnSnO3)。通过XRD、SEM等分别对偏锡酸锌的晶体结构、微观形貌等进行表征,结果表明:160℃、15h水热条件下制得了全立方形纳米偏锡酸锌;180℃、15h水热条件下制得的纳米偏锡酸锌为立方-松枝混合形貌;而180℃、24h水热条件下得到偏锡酸锌全为片状,片厚约15nm。采用传统旁热式结构对上述3种纳米偏锡酸锌进行HCHO的敏感性能研究,结果发现3种形貌的偏锡酸锌对甲醛都表现出良好的气敏特性,其中片状偏锡酸锌的甲醛气敏特性最优异,工作温度300℃时对1×10-6甲醛有较好的响应。

Three nano-zinc metastannate（ZnSnO3）oxides with different morphologies were successfully synthesized using hydrothermal method at different conditions.X-ray diffraction（XRD）,scanning electron microscopy（SEM）were employed to characterize the crystal structure and morphology of the as-synthesized ZnSnO3 oxides.The results indicated that the ZnSnO3 cubes were obtained by hydrothermal method at 160 ℃for 15 h.The ZnSnO3 with mixed morphology of cube and pine shape was prepared at 180 ℃ for 15 h,and delay the reaction time to 24 h,the ZnSnO3 was mixed morphology then changed to ultra-thin sheet ZnSnO3,whose thickness was about 15 nm.The asfabricated sensors based on three kinds of nano-ZnSnO3 showed high sensitivity toward HCHO gas.And the sensors based on flake zinc metastannate was particularly prominent in HCHO gas sensing property,which can response to1×10^-6 HCHO at 300 ℃.