Au-SiO2纳米粒子复合基底的表面增强拉曼散射性能研究
首发时间:2016-06-07
摘要:本文报道了一种高活性的表面增强拉曼散射(SERS)复合基底,它是由Au纳米粒子和SiO2纳米粒子简单混合而成。以吡啶作为探针分子,系统研究了不同粒子数比例的复合基底的SERS活性。研究结果表明:复合基底在较宽的粒子数比例范围内可以产生和纯金纳米粒子相当的SERS信号;当Au粒子和SiO2粒子数比例为10 : 3.5,复合基底的SERS信号强于纯金纳米粒子约2倍。其原因可能在于,当和SiO2纳米粒子接触后,Au纳米粒子的费米能级发生改变从而更有利于吡啶分子和金纳米粒子之间的电荷转移,即有利于发生化学增强。因此,本文的研究结果提供了一种简单的增强金纳米粒子SERS活性的方法。
关键词: 物理化学 Au纳米粒子 表面增强拉曼散射 SiO2纳米粒子 电荷转移 拉曼光谱
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Investigation on the SERS performance of composite substrate prepared by mixing Au nanoparticles and SiO2 nanoparticles
Abstract:This paper reports a highly active composite substrate, prepared by mixing Au nanoparticles (NPs) and SiO2 NPs, for strong surface-enhanced Raman scattering (SERS). Using pyridine as a probe molecule, the SERS activity of the composite substrate was investigated by changing the particle number ratio of Au NPs to SiO2 NPs. Our results reveal that the composite substrate can produce comparable SERS signal compared with that from Au NPs over a wide particle number ratios, and produce a maximum signal about 2 times higher than that from pure Au NPs at particle number ratio of 10 : 3.5. This improvement may be because that upon contacting with SERS-inactive SiO2 NPs, the Fermi level of the Au NPs change to some extent that enable charge-transfer between pyridine molecule and Au NPs, that is, facilitating chemical enhancement. This work thus provides an easy way to improve SERS performance of Au NPs.
Keywords: Physical Chemistry Au nanoparticle surface-enhanced Raman scattering SiO2 nanoparticle charge transfer Raman spectroscopy
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No.4695608115206914****
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