Hierarchical flower-like NiFe2O4 with core-shell structure for excellent toluene detection

• 作者: Yan-Lin Zhang Chao-Wei Jia Ruo-Nan Tian Hong-Tao Guan Gang Chen Cheng-Jun Dong
• 来源期刊: 稀有金属（英文版）
• 年，卷（期）: 2021,（6）
• 所属期刊栏目: ADVANCED NANOMATERIALS FOR GAS AND HUMIDITY SENSORS
• 页码范围: 1578-1587
• 页数: 10页
• 语种: 英文

摘要

The extensive use of toluene stimulates the effective detection by sensitive gas sensors based on unique materials.Here,hierarchical flower-like NiFe2O4 with core-shell architecture was synthesized by a facile hydrothermal method in the presence of urea and NH4F.The controllable experiments indicated that the burr spheres and football-like samples were produced with individual urea or NH4F.The flower-like NiFe2O4 sensor exhibited outstanding sensitivity of 19.95 to 100 × 10-6 toluene with low detection limit (1 × 10-6).Furthermore,the sensor showed superior sensing selectivity and long-term stability to toluene.The excellent sensing properties could largely arise from a combination of high surface area,numerous active sites,porous structures,and the native catalytic characteristics of NiFe2O4 to facilitate toluene molecules adsorption,diffusion,and reaction.