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采用液相法制备PbS量子点修饰MoO_3纳米带复合材料。利用XRD、FESEM、TEM、EDS等表征手段分析样品组成、结构与形貌,分别将MoO_3纳米带、PbS量子点、PbS量子点/MoO_3纳米带组装成陶瓷管气敏元件并测试其对NH_3的气敏性能。结果表明,在低温(20~100℃)下PbS量子点/MoO_3纳米带复合材料对NH3具有良好检测能力,最低测试限为10 ppm。由于PbS量子点均匀分布在MoO_3纳米带表面可形成异质结界面,这可有助于电子、空穴的分离,从而显著改善电子传输性能和气敏特性。
Preparation of PbS Quantum Dot Modified MoO_3 Nanobelt Composites by Liquid Phase Method. The composition, structure and morphology of the samples were characterized by XRD, FESEM, TEM and EDS. The MoO_3 nanobelts, PbS quantum dots and PbS QDs / MoO_3 nanobelts were assembled into ceramic tube gas sensors and tested for their effect on NH_3 Gas sensing performance. The results show that the PbS QDs / MoO 3 nanocomposite composites have good detection performance for NH 3 at low temperature (20 ~ 100 ℃) with the minimum test limit of 10 ppm. Due to the uniform distribution of PbS quantum dots on the surface of the MoO_3 nanobelts, heterogeneous interfaces can be formed, which can contribute to the separation of electrons and holes, thereby significantly improving electron transport properties and gas sensing properties.