Different behaviors in the transformation of PATP adsorbed on Ag or Au nanoparticles investigated by surface-enhanced Raman spectroscopy - A study of the effects from laser energy and annealing
Different behaviors in the transformation of PATP adsorbed on Ag or Au nanoparticles investigated by surface-enhanced Raman spectroscopy - A study of the effects from laser energy and annealing
复制标题
通过表面增强拉曼光谱研究吸附在银或金纳米粒子上的 PATP 转化的不同行为 - 激光能量和退火影响的研究
DOI：
10.1016/j.saa.2015.02.039
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发表时间：
2015
影响因子：
4.4
通讯作者：
Liu Guo-Kun
中科院分区：
文献类型：
--
作者：
Xu Jian-Fang;Luo Shi-Yi;Liu Guo-Kun
为了探索表面等离子体共振（SPR）和活性氧在对氨基噻吩（PATP）吸附在Ag或Au纳米粒子上化学转化为4,4-二巯基偶氮苯（DMAB）中的关键作用，我们系统地研究了PATP覆盖Ag和Au纳米粒子的激光波长和温度依赖的表面增强拉曼光谱。Ag NPs在514.5 nm的激光下可以很容易地观察到DMAB，而Au NPs在632.8 nm的激光下可以观察到DMAB，这表明DMAB的形成需要一个合适的能级。这种趋势与银或金纳米粒子随波长变化的SPR特性相一致。利用退火提供的能量，在较低温度下，Ag NPs上的PATP更容易转化为DMAB，在相同温度下，与Au NPs相比，可以观察到更多的DMAB。这主要是由于Ag表面活性剂的形成比Au表面活性剂的形成更容易。
In order to explore the key role of surface plasmon resonance (SPR) and active3O2for the chemical transformation to 4,4-dimercaptoazobenzene (DMAB) from p-aminothiophenol (PATP) adsorbed on Ag or Au NPs, we systematically investigated the laser wavelength and temperature dependent surface-enhanced Raman spectra of PATP capped Ag and Au NPs. DMAB can be easily observed at the 514.5 nm laser for Ag NPs but at the 632.8 nm laser for Au NPs, indicating that a suitable energy level is necessary for the formation of DMAB. The tendency is consistent with the wavelength dependent SPR properties of Ag or Au NPs accordingly. With the energy provided by annealing, the transformation of PATP to DMAB is much easier on Ag NPs at a lower temperature, and more DMAB can be observed at the same temperature, compared to the case of Au NPs under the same condition. It is mainly due to the active3O2on Ag surfaces could be more easily formed than that on Au surfaces.