The H2S Sensitivity Performance Of Two-dimensional Porous Bi-metal Oxide Semiconductor

Hydrogen sulfide(H2S)is flammable and explosive gas.Once being leaked,it will be seriously harmful to environment and human.Thus,it is necessary to explore high-performance H2S sensing devices.Among the H2S sensing devices,the sensors based on metal oxide semiconductors have high sensitivity,short response time,low cost and simple operation.However,single-metal oxide-based sensors generally have disadvantages of poor selectivity,weak detection limit and high operating temperature In the thesis,four kinds of bimetal oxide composite materials with two-dimensional(2D)nanostructures such as ZnCo2O4,Fe2(MoO4)3,SnO2/MoO3 and ZnFe2O4 were synthesized,and high-performance sensors based on these 2D nanostructures were assembled.The main research contents are shown as follows1.Porous ZnCo2O4 nanosheets were synthesized via hydrothermal method,and graphene was used as templates in experiment.Furthermore,its surface area was 90.9 m2g-1.The H2S sensitivity of ZnCo2O4 was twice that of Co3O4 counterparts.2.Porous 2D Fe2(MoO4)3 nanoflakes were controllably synthesized using G/FeOOH as precursor through adjusting different additions of hexaammonium molybdate.At 100?,the sensors based on the 2D Fe2(MoO4)3 nanoflakes could detect 10 ppb H2S.3.Porous 2D ZnFe2O4 nanosheets were controllably synthesized using G/FeOOH as precursor.The sensors based on porous 2D ZnFe2O4 nanosheets could detect H2S at 85?.4.2D SnO2/MoO3 hetero-nanosheets with porosity were synthesized using G/SnO2 as precursor through adjusting different additions molybdenyl acetylacetonate The sensitivity of S1nO2/MoO3 hetero-nanosheets was up to 43.5 against 10 ppm H2S.Overall,the sensors based on metal oxide nanostructures obtained in the thesis can detect the trace of H2S gas at the lower working temperature.Besides,the relative mechanism was also analyzed,which would provide a foundation for the development of high-performance H2S gas sensors.