化学气相沉积法制备二硫化钼薄膜及其光催化降解亚甲基蓝性能

Preparation of molybdenum disulfide films by chemical vapor deposition method and its photocatalytic degradation capability to methylene blue

分别采用新型化学气相沉积(CVD)硫化金属Mo的方法以及传统CVD硫化MoO_(3)的方法制备了MoS_(2)薄膜,对其物相和形貌进行了表征,探究了对亚甲基蓝的光催化降解性能。表征结果显示:蒸镀Mo 5 min制备的MoS_(2)薄膜具有多个晶面生长方向,其形貌多为完整的棒状;蒸镀Mo 1 min制备的MoS_(2)多为棒状碎片;硫化MoO_(3)法制备的MoS_(2)形貌为在片状结构聚集体中分布少量的三角结晶。MoS_(2)薄膜光催化降解亚甲基蓝(亚甲基蓝溶液质量浓度10 mg/L)实验结果表明,蒸镀Mo 5 min制备的MoS_(2)的亚甲基蓝降解率最高,其亚甲基蓝降解率最高达88.0%,重复使用4次后,亚甲基蓝降解率仍保持在82.4%,显示其具有较好的活性稳定性。

The MoS_(2) film was prepared by new chemical vapor deposition(CVD)-sulfurization of metal Mo and traditional CVD sulfurization of MoO_(3),respectively.The phase and morphology of MoS_(2) films were characterized,and their photocatalytic degradation capabilities to methylene blue were explored.The characterization results show that:The MoS_(2) film prepared by Mo evaporation for 5 min has multiple crystal plane growth directions,and most of them are intact rod-shaped;The MoS_(2) prepared by Mo evaporation for 1 min are mostly rod-shaped fragments;The morphology of MoS_(2) prepared by the traditional CVD method is a small amount of triangular crystals distributed in the flake structure aggregation.The experimental results show that when MoS_(2) film is used for photocatalytic degradation of methylene blue(with 10 mg/L of mass concentration),the degradation rate of methylene blue of MoS_(2) prepared by Mo evaporation for 5 min is the highest with up to 88.0%and remains at 82.4%after reuse for 4 times,showing its good activity stability.