Enhanced Photocatalytic Activity and Ferromagnetism in Gd Doped BiFeO3 Nanoparticles
Enhanced Photocatalytic Activity and Ferromagnetism in Gd Doped BiFeO3 Nanoparticles
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DOI：
10.1021/jp104660a
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发表时间：
2010-12-16
影响因子：
3.7
通讯作者：
Shen, Mingrong
中科院分区：
文献类型：
--
作者：
Guo, Renqing;Fang, Liang;Shen, Mingrong
BiFeO 3（BFO）是相当大的兴趣，因为它在磁，电，光功能相结合的设备设计的潜在应用。研究了Gd掺杂对BFO纳米粒子的结构、光催化活性和铁磁性的影响。X射线衍射和拉曼光谱结果表明，当x < 0.1时，Bi 1-xGdxFeO 3（BGFO（x）x = 0，0.05，0.1和0.15）的晶体结构保持稳定，而当x = 0.1时，观察到成分驱动的从菱方到正交的相变。BGFO（x）在可见光照射下分解罗丹明B的光催化活性随着x从0增加到0.1而增加，然后随着x = 0.15而降低。在x = 0.1的相界附近的光催化活性的最大值与纳米粒子的极性行为的变化有关。与纯BFO纳米颗粒的线性磁化强度-磁场（M-H）关系相比，掺杂样品中出现了明显的M-H环，这归因于Gd 3+离子的自旋摆线畸变和磁活性特性。
BiFeO3 (BFO) is of considerable interest because of its potential applications in the design of devices combining magnetic, electronic, and optical functionalities. Effects of the Gd dopant on the structural, photocatalytic activity, and ferromagnetic properties of BFO nanoparticles have been studied. X-ray diffraction and Raman spectra results of Bi1-xGdxFeO3 (BGFO(x) x = 0, 0.05, 0.1, and 0.15) reflect that the crystal structure of the samples remain stable for x < 0.1, while compositional-driven phase transition from rhombohedral to orthorhombic is observed at x = 0.1. The photocatalytic activity to decompose Rhodamine-B under visible-light illumination increases in BGFO(x) as x increases from zero to 0.1 and then decreases for x = 0.15. The maximum in photocatalytic activity near the phase boundary of x = 0.1 is associated with the changing of the polar behavior of the nanoparticles. Comparing with the linear magnetization-magnetic field (M-H) relation in pure BFO nanoparticles, obvious M-H loops can be observed in the doped samples, which are ascribed to the distorted spin cycloid and magnetically active characteristic of Gd3+ ions.