【摘要】 采用液相法制备PbS量子点修饰MoO₃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MoO₃纳米带、PbS量子点、PbS量子点/MoO₃纳米带组装成陶瓷管气敏元件并测试其对NH₃的气敏性能。结果表明,在低温（20¹00℃）下PbS量子点/MoO₃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MoO₃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。更多还原

【Abstract】 PbS quantum dots（ QDs） decorated MoO₃ nanobelts were prepared by liquid phase method.The composition,structure and morphology of PbS QDs/MoO₃ nanobelts were charactered by XRD,FESEM,TEM and EDS measurements. Gas sensors based on MoO₃,PbS QDs and PbS QDs/MoO₃ nanobelts were assembled using commercial ceramic tubes and their gas sensing properties towards NH3 were tested. The results show that gas sensors based on PbS QDs/MoO₃ nanobelts have a good gas sensing response to NH₃ at a relative low temperature range（ 20-100 ℃）,and the lowest detect limit is 10 ppm.PbS QDs are uniformly dispersed on the surface of the MoO₃ nanobelts, and then the formed heterojunction interface may favor for the separation of electrons and holes,which will greatly improve their electron transfer ability and gas sensing performance.更多还原