Size-Dependent Magnetic, Photoabsorbing, and Photocatalytic Properties of Single-Crystalline Bi(2)Fe(4)O(9) Semiconductor Nanocrystals

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	Size-Dependent Magnetic, Photoabsorbing, and Photocatalytic Properties of Single-Crystalline Bi(2)Fe(4)O(9) Semiconductor Nanocrystals
	Q. Zhang; W. J. Gong; J. H. Wang; X. K. Ning; Z. H. Wang; X. G. Zhao; W. J. Ren; Z. D. Zhang
	2011
发表期刊	Journal of Physical Chemistry C
ISSN	1932-7447
卷号	115 期号:51 页码:25241-25246
摘要	Single-crystalline Bi(2)Fe(4)O(9) nanocrystals (NCs) of various sizes (from 78 to 14 nm), synthesized using the sol gel method, exhibit size-dependent magnetic properties, which can be attributed to the uncompensated spins on the surface of the antiferromagnetic NCs. These tunable magnetic properties have a profound significance and can be widely applied in spintronics. As the crystal size decreases, the energy gap of the Bi(2)Fe(4)O(9) semiconductor NCs increases from 1.91 to 2.04 eV, which results from quantum confinement effect. The Bi(2)Fe(4)O(9) NCs exhibit excellent photocatalytic oxidation of methylene blue (MB) under visible light irradiation with the assistance of a small amount of H(2)O(2). Interestingly, smaller NCs exhibit higher photocatalytic activities. The size-dependence of photocatalytic properties of the Bi(2)Fe(4)O(9) NCs was ascribed to the lower recombination rate of the photogenerated electron/hole pair within smaller NCs and higher specific surface areas, which allow for stronger photon absorption on the surface of smaller crystals.
部门归属	[zhang, zhidong] chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. chinese acad sci, int ctr mat phys, shenyang 110016, peoples r china.;zhang, zd (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, 72 wenhua rd, shenyang 110016, peoples r china;zdzhang@imr.ac.cn
关键词	Sol-gel Route Quantum Dots Electronic-properties Bifeo3 Nanoparticles Catalytic-properties Ammonia Oxidation Bismuth Ferrites Exchange Bias Oxides Transition
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/30897
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Q. Zhang,W. J. Gong,J. H. Wang,et al. Size-Dependent Magnetic, Photoabsorbing, and Photocatalytic Properties of Single-Crystalline Bi(2)Fe(4)O(9) Semiconductor Nanocrystals[J]. Journal of Physical Chemistry C,2011,115(51):25241-25246.
APA	Q. Zhang.,W. J. Gong.,J. H. Wang.,X. K. Ning.,Z. H. Wang.,...&Z. D. Zhang.(2011).Size-Dependent Magnetic, Photoabsorbing, and Photocatalytic Properties of Single-Crystalline Bi(2)Fe(4)O(9) Semiconductor Nanocrystals.Journal of Physical Chemistry C,115(51),25241-25246.
MLA	Q. Zhang,et al."Size-Dependent Magnetic, Photoabsorbing, and Photocatalytic Properties of Single-Crystalline Bi(2)Fe(4)O(9) Semiconductor Nanocrystals".Journal of Physical Chemistry C 115.51(2011):25241-25246.