Synthesis And Property Study Of Tin-based Compound Micro/Nanomaterials

As a research focus of science, oxide semiconductor nanomaterialshave been investigated several dozens years. However, exploring facileand economical methods and improving properties have been the pursinggoal. As a semiconductor material, Tin-based compound is widely appliedin many fields. Recently, their application is extended further due to somespecial characteristics of the nanomaterials. So, much attention has beenpaid to the preparation method of the oxide semiconductor nanomaterialsin the world. In this paper, our efforts were focused on the study ofTin-based compound semiconductor micro/nanomaterials, we fabricated3D porous SnO₂architectures, ZnSnO₃microcubes and porous SnO₂nanomaterials successfully. Furthermore, we also investigated theirproperties and application. The major research work and results for thisdissertation are as follows:1. We prepared the crystalline single-phase copper tin hydroxideprecursors （CuSn（OH）₆） through a facile chemical solution route. Usingtin tetrachloride pentahydrate （SnCl₄5H₂O）, sodium hydroxide （NaOH）and copper chloride dihydrate （CuCl₂2H₂O） as the starting materials,combined with subsequent calcination and acid-washing process with3Mhydrochloric acid （HCl） of the precursors, then we obtained3D porousSnO₂nanomaterials. We selective prepared porous SnO₂robs and SnO₂cubes by regulating the amount of sodium hydroxide in the experiment.The as-prepared3D porous3D architectures were used to assemble gassensor, investigatived their gas sensing properties to some organic volatilegases, such as toluene and formaldehyde. We discussed the gas sensingproperties of hierarchically3D porous ZnO nanomaterials to somereducing gases. In addition, we compared the sensitivity between porousSnO₂rods and porous SnO₂cubes.2. A facile chemical solution route combined with subsequentcalcination and acid-washing process was demonstrated for the synthesisof porous SnO₂microcubes. Gas sensors were fabricated from the as-synthesized porous SnO₂microcubes and applied to detecting someVOCs in air. The as-fabricated sensor based on the porous SnO₂microcubes showed high sensitivity, fast response, and short recoverytimes toward toluene and benzene vapors due to the high porosity and3Dmorphology. In addition, the obtained porous SnO₂microcube sensor alsoexhibit good responses to formaldehyde, ethanol, and acetone, whichindicate that the porous SnO₂microcubes are highly promising forapplications of gas sensors.3. Uniform and monodisperse porous ZnSnO₃cubes weresynthesized by a template-free, economical aqueous solution methodcombined with subsequent calcination. The size of the precursorZnSn（OH）₆cubes was readily controlled from80-100nm to280-310nmby varying the pH value of the solution. The as-fabricated sensors basedon the porous ZnSnO₃cubes showed high sensitivity, fast response, andshort recovery time toward formaldehyde and toluene gases. As theparticle-size of porous ZnSnO₃cubes decreases, the sensitivity of gassensors increases. In addition, the sensors also exhibit good responses toethanol, acetone, and n-butanol, which indicate that the porous ZnSnO₃cubes are highly promising for applications of gas sensors. Due to theunique porous3D structures of the samples, the photocatalytic propertyof the obtained porous ZnSnO₃cubes was also investigated.