Fabrication of Iron Oxide Core/Gold Shell Submicrometer Spheres with Nanoscale Surface Roughness for Efficient Surface-Enhanced Raman Scattering

✍ Scribed by Zhai, Yueming; Zhai, Junfeng; Wang, Yuling; Guo, Shaojun; Ren, Wen; Dong, Shaojun

• Book ID: 120559421
• Publisher: American Chemical Society
• Year: 2009
• Tongue: English
• Weight: 309 KB
• Volume: 113
• Category: Article
• ISSN: 1932-7447
• DOI: 10.1021/jp810561q

✦ Synopsis

A method to synthesize Fe 3 O 4 core/Au shell submicrometer structures with very rough surfaces on the nanoscale is reported. The Fe 3 O 4 particles were first modified with uniform polymers through the layer-by-layer technique and then adsorbed a lot of gold nanoseeds for further Au shell formation. The shell was composed of a large number of irregular nanoscale Au particles arranged randomly, and there were well-defined boundaries between these Au nanoparticles. The Fe 3 O 4 core/Au shell particles showed strong plasmon resonance absorption in the near-infrared range, and can be separated quickly from solution by an external magnet. This kind of very rough Fe 3 O 4 core/Au shell multicomponent was used in the adsorption of 4-aminothiophenol and as a substrate for detection by surface-enhanced Raman spectroscopy.