Preparation and Gas Sensing Performance of Hierarchical Porous ZnO-based Materials with Sunflower Rods as a Biological Template

• 来源期刊: 高等学校化学研究（英文版）
• 年，卷（期）: 2019,（5）
• 页码范围: 755-761
• 页数: 7页
• 语种: 英文
• DOI: 10.1007/s40242-019-9125-2

摘要

A graded porous structure SnO2/ZnO composite was prepared with sunflower rods as a biological template.The prepared samples were subjected to phase analysis by scanning electron microscopy(SEM),transmission electron microscopy(TEM),X-ray diffractiometry(XRD) and X-ray photoelectron spectroscopy(XPS).ZnO sample was a pure phase of hexagonal wurtzite,and the template had been completely removed.The surface of the sample presented a honeycomb-like structure of a sunflower rod template,which was formed by interconnecting the porous channels,and had a smaller average size and exhibited n-n heterojunction at the n-type ZnO interface.Compared with that of pure ZnO,the response of the hierarchical porous structure SnO2/ZnO composite to 100 mg/L n-butanol reached a maximum of 40.61 at 240 ℃,about 2.7 times higher than that of pure ZnO.Its response time and recovery time are 6 and 3 s,respectively,which are also better than those of pure ZnO.SnO2/ZnO composite exhibits good gas selectivity,which is related to the improvement of the structure and the forming ofn-n heterojunctions of the material.