Heterogeneous Seeded Growth: Synthesis and Characterization of Bifunctional Fe3O4/ZnO Core/Shell Nanocrystals

被引：80

作者：

Chiu, Weesiong ^{[1
]}

Khiew, Poisim ^{[1
]}

Cloke, Michael ^{[1
]}

Isa, Dino ^{[1
]}

Lim, Hongngee ^{[1
]}

Tan, Thiankhoon ^{[1
]}

Huang, Nayming ^{[3
]}

Radiman, Shahidan ^{[2
]}

Abd-Shukor, Roslan ^{[2
]}

Hamid, M. Azmi Abd. ^{[2
]}

Chia, Chinhua ^{[2
]}

机构：

[1] Univ Nottingham Malaysia Campus, Fac Engn, Dept Chem Engn, Semenyih 43500, Selangor Darul, Malaysia

[2] Univ Kebangsaan Malaysia, Fac Sci & Technol UKM, Sch Appl Phys, Bangi 43600, Selangor Darul, Malaysia

[3] Univ Malaya, Fac Sci, Dept Phys, Solid State Phys Res Lab, Kuala Lumpur 50603, Malaysia

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2010年 / 114卷 / 18期

关键词：

2-DIMENSIONAL ZNO NANOPELLETS; STRAINED-LAYER SUPERLATTICES; MAGNETIC-PROPERTIES; QUANTUM DOTS; NANOPARTICLES; SEMICONDUCTORS; PYROLYSIS; COBALT;

D O I：

10.1021/jp100848m

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In the present study, Fe3O4/ZnO core/shell nanocrystals (NCs) are synthesized via seed-meditated growth approach in nonhydrolytic condition. The controlling process of thermal pyrolysis of zinc acetate (ZnAc) renders a condition to overgrow ZnO layer on the surface of Fe3O4 NCs (seeds). The transmission electron microscope (TEM) micrograph shows that Fe3O4/ZnO NCs are spherical in shape, highly monodispersed, and exhibiting responding shell thickness by varying the mole ratio of seed to shell precursor. The X-ray powder diffraction patterns (XRD) for Fe3O4/ZnO NCs reveal the coexistence of both Fe3O4 and ZnO crystal structures, which the patterns can be well indexed with the standard powder diffraction patterns of both materials. The NCs exhibit superparamagnetism corresponding to an external magnet field provided by vibrating sample magnetometer (VSM) and show red-shift phenomenon under UV excitation at room temperature. The NCs are magnetically separable upon application of 0.6 T magnet, which shows that high potentiality of the NCs to be used as regenerable catalyst material.

引用

页码：8212 / 8218

页数：7

共 43 条

[1] Seeded growth of asymmetric binary nanocrystals made of a semiconductor TiO2 rodlike section and a magnetic γ-Fe2O3 spherical domain [J].