单分散Au/ZnO纳米球的可控制备及气敏性能研究

Monodispersed Au/ZnO nanospheres:controllable preparation and gas sensing properties

以二水合醋酸锌和二甘醇为原料,采用微波法制备ZnO单分散纳米球;采用柠檬酸还原法制备Au纳米颗粒,并通过静电作用将金纳米颗粒修饰在ZnO纳米球上制备Au/ZnO气敏材料.XRD结果证明了多晶ZnO的形成以及金属Au的成功修饰;FESEM和TEM观察到ZnO单分散纳米球由纳米颗粒组装而成,粒径约280nm;PL光谱对合成材料的晶体缺陷进行了提取,在此基础上深入讨论了Au/ZnO的增敏机理.气敏测试结果显示,Au/ZnO纳米球比未修饰的ZnO纳米球对丙酮具有更好的选择性与更低的检测温度,在体积分数为1×10-6下仍具有较强的气敏响应.

Two hydrated zinc acetate and two glycolol as raw materials monodispersed ZnO nanospheres were synthesized by a microwave assisted synthesis.Au nanoparticles were prepared by citric acid reduction and modified on the surface of ZnO nanospheres by electrostatic interaction to form Au/ZnO gas sensing materials.The characterization of XRD confirmed the formation of polycrystal ZnO and the modification of Au nanoparticles.FESEM and TEM results revealed that the particle size of monodispersed nanospheres was 280 nm.Meanwhile,PL spectral characterization supported the analysis of sensitization mechanism.The gas sensing results show that Au/ZnO nanospheres have better selectivity and lower detection temperature for acetone than prestine ZnO nanospheres,and still have strong gas sensitive response to 1×10^-6 acetone.