Sensing performances to low concentration acetone for palladium doped LaFeO3 sensors

• Published in: Journal of rare earths Vol. 34; no. 7; pp. 704 - 710
• Main Author: 王小风 秦宏伟 裴金亮 陈艳平 李玲 谢继浩 胡季帆
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.07.2016
• Subjects: acetone; gas sensor; LaFeO3; perovskite; rare earths; sol-gel; 丙酮; 传感器; 传感性能; 低浓度; 掺杂; 纳米粉体; 选择性行为; gas sensor; perovskite; acetone; sol-gel; rare earths
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(16)60082-0

The PdC12 was mixed with nanocrystalline powders LaFeO3 and subsequently followed by an annealing of 800 ℃. PdO phase was formed and almost distributed uniformly on the surface of LaFeO3 nano-particles. With an increase of PdO amounts in composite powders, sensing sensitivity Rg/Ra to low concentration acetone or ethanol for Pd doped LaFeO3 sensors increased at first, underwent the maximum with 2 wt.% PdC12 dopant, and then doped again. Interestingly, appropriate Pd doping in LaFeO3 changed the selectivity behavior of gas sensing. LaFeO3 sensor showed good selectivity to ethanol, but 2 wt.% Pd doped LaFeO3 sensor showed good selectivity to acetone. The sensitivity for LaFeO3 at 200 ℃was 1.32 to 1 ppm ethanol, and 1.19 to 1 ppm acetone. Whereas the sensitivity for 2 wt.% Pd doped LaFeO3 at 200 ℃ was 1.53 to 1 ppm ethanol, and 1.9 to 1 ppm acetone. The 2 wt.% Pd doped LaFeO3 sensor at 200 ℃ showed very short response time （4 s） and recovery time （2 s） to 1 ppm acetone gas, respectively. Such results showed that 2 wt.% Pd doped LaFeO3 sensor is a new promising sensing candidate for detecting low concentration acetone.