| The ZnO nanorod array was deposited on the ZnO nanoparticulate film by chemical bath deposition method,on the surface of which the Fe2O3,In2O3 and Co3O4 were loadeded by hydrothermal and solventhermal method,respectively.The morphology,structure and gas properties of the heterostructure materials were analyzed.The main conclusions are as follows:1)The Fe2O3/ZnO heterostructure array was prepared by the hydrothermal method.The Fe2O3 nanoparticles were distributed on the surface of ZnO nanorod array with the size 30 nm.Comparing with ZnO nanorod array,Fe2O3/ZnO heterostructure array showed higher selectivity to ethanol,the sensitivity increased 8 times.The sensitivity of Fe2O3/ZnO heterostructure array to 100 μL·L-1 ethanol at 370℃ was 85,the response and recovery time were 3 s and 48 s,respectively.As low as 0.01 μL·L-1 ethanol is detected by the heterostructure array2)The In2O3/ZnO heterostructure array prepared by the solventhermal method.The In2O3 nanorods were distributed on the surface of ZnO nanorod array with length 50 nm and diameter 3-5 nm.Comparing with ZnO nanorod array,the In2O3/ZnO heterostructure array exhibited higher selectivity to NOx.The sensitivity of In2O3/ZnO heterostructure array to 100 μL·L-1 NOx at 170℃ was 24,the response and recovery time were 8 s and 96 s.It could detect NOx as low concentration as 0.1 μL/L.3)The Co3O4/ZnO heterostructure array prepared by the solventhermal method.The Co3O4 nanoparticles were distributed on the surface of ZnO nanorod array with size 10 nm.Comparing with ZnO nanorod array,the Co3O4/ZnO heterostructure array showed higher selectivity to TEA.The sensitivity of Co3O4/ZnO heterostructure array to 100 μL·L-1 TEA at 290℃ was 90,the response and recovery time were 8 s and 104 s.As low as 0.01 μL·L-1 TEA is detected by the heterostructure array. |
