首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Direct observations of electrochemical reactions within Au-YSZ thin films via absorption shifts in the an nanoparticle surface plasmon resonance
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Direct observations of electrochemical reactions within Au-YSZ thin films via absorption shifts in the an nanoparticle surface plasmon resonance

机译:通过纳米粒子表面等离子体激元共振中的吸收位移直接观察Au-YSZ薄膜内的电化学反应

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The surface plasmon resonance (SPR) band of Au nanoparticles embedded in an YSZ matrix was monitored at 500 degrees C under varying gas exposure concentrations of H-2 and O-2 in N-2. Because the peak position of the SPR band relies closely on the number of driven oscillating free electrons per gold nanoparticle, we were able to monitor electrochemical charge transfer from Au nanoparticles to diffusing oxygen ions by monitoring the optical properties of the Au-YSZ nanocomposite thin film, specifically the peak position of the SPR band. A direct relation was observed for the change in the equilibrium ratio, PH21/4/po(2)(1/8), contributing to oxygen ion diffusion into and out of the YSZ matrix, and the change in the square of the SPR band peak position. Free electron theory states that this change in the square of the SPR band peak position is directly proportional to the change in conduction electrons available per Au nanoparticle; thus, our observations agree with the expected trend for charge transfer vs the redox gas mixture.
机译:在N-2中H-2和O-2的气体暴露浓度不同的情况下,在500摄氏度下监测嵌入YSZ基质中的Au纳米粒子的表面等离子体共振(SPR)带。因为SPR谱带的峰值位置紧密依赖于每个金纳米粒子的驱动振荡自由电子的数量,所以我们能够通过监测Au-YSZ纳米复合薄膜的光学性质来监测从Au纳米粒子到扩散氧离子的电化学电荷转移。 ,特别是SPR频段的峰值位置。观察到平衡比PH21 / 4 / po(2)(1/8)的变化有直接关系,这有助于氧离子扩散进YSZ基质和从YSZ基质中扩散出来,以及SPR带平方的变化。高峰位置。自由电子理论指出,SPR谱带峰位置的平方的这种变化与每个Au纳米粒子可用的导电电子的变化成正比。因此,我们的观察结果与电荷转移与氧化还原气体混合物的预期趋势一致。

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