The role of gold catalyst on the sensing behavior of ZnO nanorods for CO and NO₂ gases

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• 作者：Prabhakar Rai  ; [Author Vitae] ; Yun-Su Kim  ; [Author Vitae] ; Hyeon-Min Song  ; [Author Vitae] ; Min-Kyung Song  ; [Author Vitae] ; Yeon-Tae Yu ; ^{yeontae@chonbuk.ac.kr}  ; [Author Vitae]
• 关键词：ZnO nanorods ; Au nanoparticles ; Gas sensor ; Selectivity ; CO ; NO2
• 刊名：Sensors and Actuators B ; Chemical
• 出版年：2012
• 期刊代码：161_09254005
• 类别：et
• 出版时间：April, 2012
• 卷：165
• 期：1
• 页码：133-142
• 文件大小：2409 K

摘要

A facile one-pot strategy was developed for the assembly of gold nanoparticles (Au NPs) onto single crystalline ZnO nanorods using cetyltrimethylammonium bromide (CTAB) as a capping agent. Zinc oxide nanorods were synthesized by hydrothermal method whereas the Au NPs (below 5 nm) were deposited on the surface of ZnO nanorods by the solution growth method. Gas sensing properties of Au/ZnO nanorods were studied at various temperatures for various concentrations of reducing (CO) and oxidizing (NO₂) gases in synthetic air and compared with pristine ZnO nanorods. Sensor fabricated by Au/ZnO nanorods showed significantly enhanced sensing performances for CO gas while opposite was the case with NO₂ gas as compared to pristine ZnO nanorods. The highest response of Au/ZnO nanorods for CO gas was 12 at 150 掳C while for ZnO nanorods, it was 6.12 at 400 掳C. Whereas the highest response of Au/ZnO nanorods for NO₂ gas was 4.14 while for ZnO nanorods, it was 10 at 300 掳C. It was found that Au NPs acted as promoter for CO gas while inhibiter for NO₂ gas sensing due to their different sensing mechanisms. This study suggested that noble metals decoration of ZnO nanorods can be used for selectivity issue between CO and NO₂ gases.