Synthesis, characterization, and comparative gas-sensing properties of Feub>2ub>Oub>3ub> prepared from Feub>3ub>Oub>4ub> and Feub>3ub>Oub>4ub>-chitosan

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• 作者：Nguyen Duc Cuong^a ; ^b ; ^c ; Tran Thai Hoa^b ; Dinh Quang Khieu^b ; Tran Dai Lam^d ; Nguyen Duc Hoa^c ; Nguyen Van Hieu^c ; ^{hieu@itims.edu.vn}
• 关键词：Fe2O3 ; Fe3O4 ; Gas sensor ; Chitosan
• 刊名：Journal of Alloys and Compounds
• 出版年：2012
• 期刊代码：45_09258388
• 类别：ms
• 出版时间：15 May, 2012
• 卷：523
• 期：Complete
• 页码：120-126
• 文件大小：1731 K

摘要

In this paper, Feub>3ub>Oub>4ub> and chitosan (CS)-coated Feub>3ub>Oub>4ub> nanoparticles were synthesized via co-precipitation method and subsequent covalent binding of CS onto the surface for functionalization, respectively. Characterization of the crystal structures and morphologies of as-synthesized nanoparticles by X-ray diffraction, scanning electron microscopy, and transmission electron microscopy demonstrated that Feub>3ub>Oub>4ub> had a cubic spinal structure with irregular shapes and average diameters of 10-20 nm. The surface states and magnetic properties of Feub>3ub>Oub>4ub>-CS nanoparticles were characterized by Fourier transform infrared spectra and vibrating sample magnetometry. Results showed that Feub>3ub>Oub>4ub>-CS nanoparticles possessed super-paramagnetic properties, with saturated magnetization up to 60 emu/g. In addition, Feub>3ub>Oub>4ub> and CS-coated Feub>3ub>Oub>4ub> nanoparticles were used in the fabrication of 伪-Feub>2ub>Oub>3ub> based gas sensors. Gas sensing measurements revealed that the 伪-Feub>2ub>Oub>3ub> gas sensor prepared from Feub>3ub>Oub>4ub>-CS had a better response to Hub>2ub>, CO, Cub>2ub>Hub>5ub>OH, and NHub>3ub> compared with the device prepared from pristine Feub>3ub>Oub>4ub>. Furthermore, the 伪-Feub>2ub>Oub>3ub> sensor prepared from Feub>3ub>Oub>4ub>-CS nanoparticles exhibited the highest response to CO among the test gases, suggesting that it has great potential for practical applications in environmental monitoring.