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 

机构地区：[1]School of Materials and Energy,Yunnan University,Kunming 650091,China

出　　处：《Rare Metals》2021年第6期1578-1587,共10页稀有金属（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (No.11564042);the Precious Metal Materials Genetic Engineering Major Project of Yunnan Province (No.2019ZE001);the Project of the Department of Science and Technology of Yunnan Province (Nos.2018FB091 and 2019FB129);the Project of the Department of Education of Yunnan Province (No.2019J0001)。

摘　　要：The extensive use of toluene stimulates the effective detection by sensitive gas sensors based on unique materials.Here,hierarchical flower-like NiFe_(2)O_(4) with core-shell architecture was synthesized by a facile hydrothermal method in the presence of urea and NH4 F.The controllable experiments indicated that the burr spheres and football-like samples were produced with individual urea or NH4 F.The flower-like NiFe_(2)O_(4) 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 longterm 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 NiFe2 O4 to facilitate toluene molecules adsorption,diffusion,and reaction.

关 键 词：HIERARCHICAL NIFE2O4 CORE-SHELL Gas sensor TOLUENE 

分 类 号：X831[环境科学与工程—环境工程] TB383.1[一般工业技术—材料科学与工程]