Preparation And Gas Sensing Properties Of SnO₂ Hollow Nanomaterials

SnO₂ hollow nanostructured multi-layer wall has become a reality in the hands of many scientists,but limited by the template,mostly spherical multi-layer structure,other morphology in the chemical reaction thermodynamics is not very easy to synthesize,so the results are few,This is a place worth pondering.Because of the lack of specific non-spherical templates,general synthetic strategies,and multiple difficult ingredients for building thermodynamically complex shapes,the use of multi-layer shells to create non-spherical hierarchical structures remains a huge challenge.Multi-layer non-spherical hollow structure of the synthesis There is no general method,a simple template method,hydrothermal and other methods can not be one-step synthesis.In this paper,tin oxide was selected as the research object,combined with doping and nanometer to improve the gas-sensing properties of tin oxide to explore the development of a variety of important tin oxide nanomaterial and its modified version of the material to explore its reaction and growth mechanism,Tested their gas-sensing properties,providing a proven synthetic path.In this paper,the morphology of nanosheets under different preparation conditions was explored by hydrothermal method.The morphology of nanosheets was consistent with the law of Oswald.And the precursor is used to obtain the tin oxide flower-like multilayered nanosheets by annealing-etching step,and the tin oxide nanosheets obtained by annealing with the calcium stannate nanosheets are parallel to each other and maintain a certain degree Link to get a stable hierarchical structure.And under the condition of this article,the iron oxide tends to heterogeneous nucleation rather than the self-forming iron oxide nanorods.Nucleation,the resulting iron oxide nanorods grow perpendicular to the surface of the nanosheets and provide a possible path for heterogeneous nuclei.In addition to further step hydrothermal and subsequent Pd doping synthesis of Pd-supported tin oxide hollow spheres,the time-node studies have been carried out to determine the composition of the nanorods of tin oxide hollow spheres resulting in the hollow structure of the reason that Oswald ripened,A simple synthetic route.The results of gas sensing confirmed that the doping of palladium particles could significantly improve the sensing ability of toluene,showing a maximum improvement value of 52.9 at 230 ?,and showed good selectivity.The typical response time??res?and recovery time??recov?for 20 ppm toluene were about 0.48 s and 5.5 s,respectively.