ZnO纳米粒子沉积MoS_2纳米片的组装及其光催化性能

Fabrication and photocatalytic properties of ZnO nanoparticles deposited MoS_2 nanoflakes

通过室温搅拌混合过程,将前驱物ZnO纳米粒子悬浊液与MoS_2纳米片悬浊液按一定比例直接混合,制得ZnO纳米粒子沉积在MoS_2纳米片表面上的纳米复合材料。使用各种测试技术对这种复合材料进行了表征,结果表明,ZnO纳米粒子呈六方晶相,形貌由两部分构成,一部分呈纳米棒状,直径主要在2~9nm之间;另一部分呈近球形,粒径主要在3~10nm之间;MoS_2纳米片是2H型晶相,呈单层或少层。由于在光照下ZnO上的电子传递到MoS_2纳米片表面,ZnO在510nm附近的激子发光带强度明显减弱。对罗丹明B的光催化性能测试结果证实,在可见光照射下,复合材料的光催化活性与纯MoS_2纳米片基本相当;而在紫外光照射下,复合材料的光催化活性最高,在光照160min后,其光降解率可达92%。

The ZnO nanoparticle-deposited MoS2 nanoflakes can be fabricated simply through a mixing process between ZnO-nanoparticle suspension and MoS2-nanoflake suspension at room temperature.Such nanocomposite was characterized by various measurement techniques.The results show that the ZnO nanoparticles exhibit six crystalline phases and include two parts：nanorod-like particles mainly with diameter range of 2-9 nm and nanosphere-like particles mainly with diameter range of 3-10 nm.The MoS2 nanoflakes exhibit 2 H-type structure as well as monolayer or few layers morphology.For the ZnO nanoparticles on the surface of the MoS2 nanoflakes,the exciton luminescence band at about 510 nm markedly decreases due to electron transform from the ZnO to MoS2.The photocatalytic experiments in Rhodamine B aqueous solution demonstrate that under visible light irradiation,the photocatalytic activity of the nanocomposite is similar with that of pure MoS2 nanoflakes.Whereas under ultraviolet,the photocatalytic activity of the nanocomposite is the highest,and after 160 min of irradiation,the photodegradation rate can reach 92%.