Highly selective ammonia sensors based on Co_{1?span style='font-style: italic'>x}Ni_xFe₂O₄/multi-walled carbon nanotubes nanocomposites

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• 作者：Ya Tang^a ; ^b  ; [Author Vitae] ; Qinghong Zhang^b  ; [Author Vitae] ; Yaogang Li^a ; ^{yaogang_li@dhu.edu.cn}  ; [Author Vitae] ; Hongzhi Wang^b ; ^{wanghz@dhu.edu.cn}  ; [Author Vitae]
• 关键词：Nanostructure ; Chemical synthesis ; Magnetic properties ; Gas-sensing properties
• 刊名：Sensors and Actuators B: Chemical
• 出版年：2012
• 出版时间：5 July, 2012
• 年：2012
• 卷：169
• 期：Complete
• 页码：229-234
• 全文大小：1272 K

文摘

Co_1?em>xNi_xFe₂O₄/multi-walled carbon nanotubes (MWCNTs) nanocomposites (x = 0.2, 0.4, 0.5, 0.6, 0.8) were synthesized via an in situ solvothermal method using ethylene glycol as solvent. X-ray diffraction analysis result confirmed that MWCNTs and high purity Co_1?em>xNi_xFe₂O₄ nanocrystallites coexisted in the nanocomposites. Transmission electron microscopy revealed that 50-60 nm Co_1?em>xNi_xFe₂O₄ nanoparticles (NPs) were densely clustered along the length of the MWCNTs. Substitution of the Co²⁺ by Ni²⁺ at octahedral sites was verified by vibrating sample magnetometry. Co_1?em>xNi_xFe₂O₄/MWCNTs nanocomposites have a high selectivity for ammonia vapor, with a sensitivity greater than that observed for either bare MWCNTs or Co_1?em>xNi_xFe₂O₄ NPs.