Facile preparation of ¦Á-Fe₂O₃@Ag core-shell structured nanoparticles

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• 作者：Qian Li^a ; ^b ; Ming Tian^a ; ^b ; Li Liu^a ; ^c ; Hua Zou^b ; ^c ; Liqun Zhang^a ; ^c ; Wen Cai Wang^a ; ^b ; ^{wangw@mail.buct.edu.cn}
• 关键词：Dopamine ; Silver ; ¦Á-Fe2O3 ; Electroless plating ; Core&ndash ; shell structure
• 刊名：Electrochimica Acta
• 出版年：2013
• 出版时间：28 February, 2013
• 年：2013
• 卷：91
• 期：Complete
• 页码：114-121
• 全文大小：1545 K

文摘

A novel and facile strategy for the synthesis of ¦Á-Fe₂O₃@Ag hybrid nanoparticles with the assistance of dopamine surface functionalization was brought forward. The surface of the ¦Á-Fe₂O₃ particles was first functionalized by polydopamine (PDA), and silver was then plated on the ¦Á-Fe₂O₃/PDA surface by electroless plating. The method had the advantage of being simple, nontoxic, controllable, and cost-effective. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectroscopy (FTIR) were used to study the crystal structure, surface chemical compositions, and functional groups, respectively, of the hybrid nanoparticles. The results indicated that PDA was successfully deposited on the surfaces of ¦Á-Fe₂O₃ nanoparticles without affecting their crystal structures. The size and uniformity of the silver nanoparticles could be well controlled by adjusting the concentrations of silver nitrate (AgNO₃) and polyvinylpyrrolidone (PVP). The morphology of the nanoparticles was observed by high-resolution transmission electron microscopy (HRTEM) and laser particle size and potential analyzer, respectively. The results showed that the silver nanoparticles were about 8 nm in diameter and uniformly coated on the surface of ¦Á-Fe₂O₃ nanoparticles. The silver nanoparticles showed good stability on the ¦Á-Fe₂O₃ substrate even after they were subjected to an ultrasonic experiment for 30 min.