tailieunhanh - Báo cáo hóa học: " Fe3O4–Au and Fe2O3–Au Hybrid Nanorods: Layer-by-Layer Assembly Synthesis and Their Magnetic and Optical Properties"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Fe3O4–Au and Fe2O3–Au Hybrid Nanorods: Layer-by-Layer Assembly Synthesis and Their Magnetic and Optical Properties | Nanoscale Res Lett 2010 5 1755-1761 DOI s11671-010-9706-y NANO EXPRESS Fe3O4-Au and Fe2O3-Au Hybrid Nanorods Layer-by-Layer Assembly Synthesis and Their Magnetic and Optical Properties Hongliang Zhu Enze Zhu Guofu Ou Linhui Gao Jianjun Chen Received 26 May 2010 Accepted 15 July 2010 Published online 1 August 2010 The Author s 2010. This article is published with open access at Abstract A layer-by-layer technique has been developed to synthesize FeOOH-Au hybrid nanorods that can be transformed into Fe2O3-Au and Fe3O4-Au hybrid nanorods via controllable annealing process. The homogenous deposition of Au nanoparticles onto the surface of FeOOH nanorods can be attributed to the strong electrostatic attraction between metal ions and polyelectrolyte-modified FeOOH nanorods. The annealing atmosphere controls the phase transformation from FeOOH-Au to Fe3O4-Au and a-Fe2O3-Au. Moreover the magnetic and optical properties of as-synthesized Fe2O3-Au and Fe3O4-Au hybrid nanorods have been investigated. Keywords Layer-by-layer Hybrid nanomaterials Iron oxide Magnetic properties Introduction Hybrid nanomaterials consisting of two or more different nanoscale functionalities have attracted much attention due to their novel combined properties and technological applications 1 2 . Among them iron oxide-Au Fe3O4-Au H. Zhu E. Zhu L. Gao J. Chen Center of Materials Engineering Zhejiang Sci-Tech University Xiasha University Town 310018 Hangzhou People s Republic of China G. Ou Lab of Multiphase Flow Erosion Deposition Zhejiang Sci-Tech University Xiasha University Town 310018 Hangzhou People s Republic of China e-mail ougf@ a y-Fe2O3-Au nanocomposites are of great importance for their combined optical and magnetic properties and potential applications in the fields of biotechnologies and catalysts 3-8 . Up to now many methods have been developed to synthesize various Fe3O4-Au and a y-Fe2O3-Au nanocomposites 9-19 . For example Yu et al. 10 reported the .