Fu Hao, Yu Ke, Li Honglin, Li Jinzhu, Guo Bangjun, Tan Yinghua, Song Changqing, Zhu Ziqiang
Key Laboratory of Polar Materials and Devices (Ministry of Education of China), Department of Electronic Engineering, East China Normal University, Shanghai, 200241, P. R. China.
Dalton Trans. 2015 Jan 28;44(4):1664-72. doi: 10.1039/c4dt03035d.
Two types of molybdenum disulfide (MoS2) titania nanoheterojunctions with different morphologies were synthesized via two different approaches. They were facile and additive-free hydrothermal processes, which resulted in a high material productivity and controllable morphologies. Both the synthesis and their growth mechanisms are discussed in this paper. The field emission properties of MoS2 titania nanoheterojunctions were investigated in this research. The experimental data indicated that the MoS2@TiO2 heterojunctions had an excellent field emission performance with a turn-on field of 2.2 V μm(-1) and threshold field of 3.6 V μm(-1) on Si substrate because of the large quantities of sharp edges. Furthermore, because the p-n heterojunctions were formed, the photocatalytic activities of both composites were evaluated by monitoring the photodegradation of methylene blue. The results showed that the TiO2@MoS2 heterojunctions had better photocatalytic properties with 90% degradation within 100 minutes. The morphological differences generated from different synthetic approaches made a huge impact on the composites' properties.
通过两种不同的方法合成了两种具有不同形态的二硫化钼（MoS2）-二氧化钛纳米异质结。它们是简便且无添加剂的水热法，具有高材料产率和可控的形态。本文讨论了合成方法及其生长机制。本研究中对MoS2-二氧化钛纳米异质结的场发射特性进行了研究。实验数据表明，由于大量尖锐边缘，MoS2@TiO2异质结在硅衬底上具有优异的场发射性能，其开启场为2.2 V μm(-1)，阈值场为3.6 V μm(-1)。此外，由于形成了p-n异质结，通过监测亚甲基蓝的光降解来评估两种复合材料的光催化活性。结果表明，TiO2@MoS2异质结具有更好的光催化性能，在100分钟内降解率达90%。不同合成方法产生的形态差异对复合材料的性能产生了巨大影响。
