ZnSnO_3纳米粉体的制备及其Cl_2气敏性能研究

Preparation of Nanosized ZnSnO_3 Powders and Its Gas Sensitivity Properties to Cl_2

以Sn粒和Zn粒为原料,在柠檬酸体系中,用溶胶凝胶法合成了纳米ZnSnO3粉体.用XRD、TEM对产物的组成、粒径大小、形貌进行了表征.结果表明:产物为平均粒径10 nm左右的圆球形颗粒.采用静态配气法测试了不同烧结温度下材料对氧化性气体的气敏性能,发现烧结温度为700℃的纳米ZnSnO3材料在最佳工作温度为360℃对体积分数为5×10-5的氯气的灵敏度高达1 973,而且对其他气体有很好的抗干扰能力.元件的响应恢复特性良好,响应时间和恢复时间分别为2 s和10 s.

ZnSnO3 nanosized powders was synthesized by sol-gel method in the system of citric acid with Sn and Zn as the precursor materials. The structure and crystal state of the podwer were characterized by XRD and TEM techniques. The results show that the final powders are ZnSnO3 with 10 nm of its particle size. The study of sensor g gas sensing characteristic shows ZnSnO3 has higher sensitivity（ 1 793 ）to Cl2 at the optimum working temperature （360 ℃ ） when the precursor has been treated at 700 ℃, farthermore, it has the highest selectivity to Cl2. The response time to Cl2 and recovery time are 2 s and 10 s, respectively.