Health & Environmental Research Online (HERO)


Print Feedback Export to File
3076225 
Journal Article 
Synthesis of three-dimensionally ordered macroporous LaFeO3 with enhanced methanol gas sensing properties 
Qin, J; Cui, Z; Yang, X; Zhu, S; Li, Z; Liang, Y 
2015 
1 
Sensors and Actuators B: Chemical
ISSN: 0925-4005
EISSN: 1873-3077 
209 
706-713 
WOS:000349082200094 
Three-dimensionally ordered macroporous (3DOM) LaFeO3 was synthesized by a simple PMMA template method. The structure morphology and composition of as-prepared products have been characterized by SEM, XRD, and TEM. The products show long-range ordered hexagonal arrangement forming an inverse opal nanostructure. The surface area of 3DOM LaFeO3 is almost twice larger than that of bulk LaFeO3. The methanol gas sensing performance of 3DOM LaFeO3 was systemically studied. The as-performed samples show p-type semi-conducting properties for all the tested gases within the temperature range of 150-300 degrees C. The 3DOM LaFeO3 shows the highest gas response (as high as 96) and the fastest response-recovery times at 190 degrees C. In addition, it shows superior selectivity to methanol. This enhancement in gas-sensing properties is attributed to its ordered macro-mesoporous structure, large surface area, numerous surface active sites and oxygen vacancies. (C) 2014 Elsevier B. V. All rights reserved. 
LaFeO3; Three-dimensionally ordered macroporous; Gas sensor; Methanol; Highly sensitivity