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Fig. 4 shows the Raman spectra (LABRAMHR Confocal Laser MicroRaman spectrometer,514.5 nm, 250 mW) of the as-synthesized NiO nanorods. It can be seen that there are four Raman peaks at 420, 546, 712, and 1092 cm-1, espectively. Compared to the predicted data of cubic NiO single crystal [26], we can assigned the peaks at 420 and 546 cm-1 to the first-order transverse optical (TO) and longitudinal optical (LO) phonon modes of NiO, respectively. The emaining peaks at 712 and 1092 cm-1 can be assigned as combination of 2TO and 2LO, respectively, and are all shifted down in frequency about 68 cm-1. Since k = 0 phonons in the paramagnetic (cubic) phase transform as Γ-4 , no firstorder Raman scattering is expected. Therefore the observed first-order Raman peaks near the 420 (TO) and 546 cm-1 (LO) must derive from paritybreaking imperfections [26]. This conclusion is confirmed by the enhancement of the first-order Raman scattering in the black NiO, where the nickel vacancy concentration is high. The combination Raman scattering trends to vanish at the C point but is usually strong elsewhere in the Brillouin zone. This explains why the combination peaks are all shifted down in frequency, since both LO and TO branches are expected to be depressed in frequency away from the zone center. （Chemical Physics Letters 362 (2002) 119–122） |
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guoqiusong(金币+5, 翻译EPI+1): 2010-04-25 09:21
guoqiusong(金币+5): 2010-05-07 10:42:16
guoqiusong(金币+5): 2010-05-07 10:42:16
| 图4所示为合成的养花镍纳米棒的拉曼谱。可以看出有四个拉曼峰，分别位于 420, 546, 712, and 1092 cm-1, 。与预测的立方氧化镍单晶的拉曼数据相比较，我们可以将712和1092cm-1的峰认为是2TO 和2LO分别产生的，并且都向低频移动了大约68 cm-1。因为k=0时立方相里面的光子转变为Γ-4，不会出现第一序拉曼散射。因此观察到的位于420和546的两个第一序的拉曼风必然是由部分分别的不连续造成的。【26】这一结论由黑氧化镍（镍的空位浓度很高）第一序拉曼散射增强可得到证明。这种组合的拉曼散射在C点趋向于消失而在Brillouin区域的其他地方通常是较强的。这解释了为什么组合峰集体漂移，因为远离区域中心LO 和 TO都将受到抑制。 |
2楼2010-04-25 07:11:17
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